Dennis Kuria

REPUBLIC OF KENYA PROPOSED REHABILITATION WORKS AT HYRAX HILL PREHISTORIC SITE W.P ITEM NO. D1134 RV/NKU/2301 JOB NO. 11362A TENDER SPECIFICATIONS AND BILL OF QUANTITIES FOR ELECTRICAL INSTALLATION WORKS CLIENT THE DIRECTOR GENERAL NATIONAL MUSEUMS OF KENYA, P.O. BOX-, NAIROBI WORKS SECRETARY CHIEF ENGINEER (ELECTRICAL) MINISTRY OF LANDS, PUBLIC WORKS, HOUSING & URBAN DEVELOPMENT, STATE DEPARTMENT FOR PUBLIC WORKS, P.O BOX 30743 – 00100, MINISTRY OF LANDS, PUBLIC WORKS, HOUSING & URBAN DEVELOPMENT, STATE DEPARTMENT FOR PUBLIC WORKS, P.O BOX 41191 – 00100, NAIROBI NAIROBI ARCHITECT CHIEF ARCHITECT STRUCTURAL ENGINEER CHIEF STRUCTURAL ENGINEER MINISTRY OF LANDS, PUBLIC WORKS, HOUSING & URBAN DEVELOPMENT, STATE DEPARTMENT FOR PUBLIC WORKS, P.O BOX 30743 – 00100, NAIROBI MINISTRY OF LANDS, PUBLIC WORKS, HOUSING & URBAN DEVELOPMENT, STATE DEPARTMENT FOR PUBLIC WORKS, P.O BOX 30743 – 00100, NAIROBI QUANTITY SURVYOR CHIEF QUANTITY SURVEYOR MECHANICAL ENGINEER CHIEF ENGINEER (MECHANICAL (BS)) MINISTRY OF LANDS, PUBLIC WORKS, HOUSING & URBAN DEVELOPMENT, STATE DEPARTMENT FOR PUBLIC WORKS, P.O BOX 30743 – 00100, MINISTRY OF LANDS, PUBLIC WORKS, HOUSING & URBAN DEVELOPMENT, STATE DEPARTMENT FOR PUBLIC WORKS, P.O BOX 41191 – 00100, NAIROBI NAIROBI June, 2024 i TABLE OF CONTENTS TITLE PAGE Contents....................................................................................................……… i PART 1: Tendering Procedures………................................................................... 1-2 PART 1I: Work Requirements SECTION I: Bill of Quantities………………………………....................................5-21 SECTION II: Specifications......................................................................................22-54 SECTION III: Technical Schedule ………………………......................................55-56 SECTION IV: Schedule Unit of Rates ……………………….................................57-59 ii PART 1 - TENDERING PROCEDURES SECTION III - EVALUATION AND QUALIFICATION CRITERIA 1. General Provision Wherever a Tenderer is required to state a monetary amount, Tenderers should indicate the Kenya Shilling equivalent using the rate of exchange determined as follows: a) For construction turnover or financial data required for each Year-Exchange rate prevailing on the last day of the respective calendar year (in which the amounts for that year is to be converted) was originally established. b) Value of single Contract-Exchange rate prevailing on the date of the contract signature. c) Exchange rates shall be taken from the publicly available source identified in the ITT. Any error in determining the exchange rates in the Tender may be corrected by the Procuring Entity. This section contains the criteria that the Employer shall use to evaluate tender and qualify tenderers. No other factors, methods or criteria shall be used other than specified in this tender document. The Tenderer shall provide all the information requested in the forms included in Section IV, Tendering Forms. The Procuring Entity should use the Standard Tender Evaluation Report for Goods and Works for evaluating Tenders. Evaluation and contract award Criteria The Procuring Entity shall use the criteria and methodologies listed in this Section to evaluate tenders and arrive at the Lowest Evaluated Tender. The tender that (i) meets the qualification criteria, (ii) has been determined to be substantially responsive to the Tender Documents, and (iii) is determined to have the Lowest Evaluated Tender price shall be selected for award of contract. 2. Preliminary examination for Determination of Responsiveness The Procuring Entity will start by examining all tenders to ensure they meet in all respects the eligibility criteria and other requirements in the ITT, and that the tender is complete in all aspects in meeting the requirements of “Part 2–Procuring Entity's Services Requirements”, including checking for tenders with unacceptable errors, abnormally low tenders, abnormally high tenders and tenders that are front loaded. The Standard Tender Evaluation Report for Goods and Works for evaluating Tenders provides clear guidelines on how to deal with review of these requirements. Tenders that do not pass the Preliminary Examination will be considered irresponsive and will not be considered further. S/No PRELIMINARY EVALUATION CRITERIA / MANDATORY REQUIREMENTS Electrical Installation Works MR1 Company Certificate of incorporation/registration; MR2 Valid Tax Compliance Certificate; MR3 Current certificate of Registration with National Construction Authority (NCA 8 and above) in Electrical Installation Works; MR4 Current and Valid NCA contractor’s practicing licence MR5 Current and Valid Licence with the Energy and Petroleum Regulatory Authority (EPRA) in Class C1 in Electrical Installation Works. MR6 Current and Valid Licence with the Energy and Petroleum Regulatory Authority (EPRA) in Class T1 for Solar Installation Works. 1 TECHNICAL EVALUATION At this stage technical evaluation shall be done by comparing each tender to the technical requirements in the tender document YES/NO Item Description 1. 2. Compliance with Technical Specifications (Note: See Compliance to Technical Specifications section on the next page ) Qualification and Experience of Key Personnel Academic Qualification and Experience (Provide evidence) a) Director of the firm • Holder of at least a diploma with 5 years’ experience in Electrical Engineering field b) Project Manager • Holder of at least a degree with 5 years’ experience in Electrical Engineering field c) At least 3 No artisans • Holder of at least a certificate with 5 years’ experience in relevant Engineering field The tenderer MUST fill the forms listed below in the format provided and attach the necessary qualification certificates: 1. Form PER - 1 Contractor's Representative and Key Personnel Schedule 2. Form PER - 2 Resume and Declaration - Contractor's Representative and Key Personnel. 3. Experience of the firm in similar services: Electrical Works a) Provide Three (3No.) projects of similar nature, complexity and magnitude) between the Period 2019 – 2023: (Provide evidence) The tenderer MUST fill the forms listed below in the format provided 1. Form EXP – 3.4 Current contract commitments/works in progress 2. Form EXP – 4.1 General Construction and contract Experience 3. Form EXP – 4.2.a Specific and Contract Management Experience 4. Form EXP – 4.2.b Construction Experience and Key Activities 4. Adequacy of tools and equipment The tenderer must show proof of ownership or leasing of the following equipment: a) Relevant Transport (at least 3No.) • Means of transport b) Relevant Equipment (at least 3No.) Electrical Works • Phase Sequence meter; • Earth loop impedance Tester; • Earth resistance tester; • Insulation resistance tester; • Clamp meter/multimeter; QUALIFIED YES / NO 2 COMPLIANCE TO TECHNICAL SPECIFICATIONS Tenderers shall submit offers that comply with the requirements of the tendering documents, including the basic technical design as indicated in the Drawings and Specifications. Tenderers shall be required; a) On compliance with Technical Specifications, bidders shall supply equipment/items that comply with the technical specifications set out in the bid document. In this regard, the bidders will be required to submit relevant technical brochures/catalogues with the tender document, highlighting (using a mark-pen or highlighter) the Catalogue Number/model of the proposed items. Such brochures/catalogues should indicate comprehensive relevant data of the proposed equipment/items which should include but not limited to the following: (i) Standards of manufacture; (ii) Performance ratings/characteristics/ features; (iii) Material of manufacture; (iv) Electrical power ratings; and (v) All other requirements as indicated in the technical specifications of the bid. The bid will then be analyzed, using the information in the technical brochures, to determine compliance with key technical specifications for the works/items as indicated in the tender document. The tenderer shall fill in the Technical Schedule as specified in the tender document for Equipment and Items indicating the Model/Make/Manufacturer and catalogue numbers of the Items/Equipment they propose to supply. Bidders not complying with any of the key technical specifications shall be considered noncompliant to the technical specifications while those meeting all the key technical specifications shall be considered compliant. Compliance in this section shall be as shown below: 3 Description COMPLIANT / NONCOMPLIANT Compliance with Technical Specifications (Note: 1) Tender Evaluation Committee to evaluate compliance to all technical specifications for all the Electrical Services Installation Works as detailed in the Particular specifications and technical schedule of this document 2) Bidders who do not highlight catalogue number and model of the proposed items shall be considered non-compliant. 3) Non-compliance to any of the specifications shall render the whole system non-compliant 4 PART II - WORKS REQUIREMENTS SECTION I - BILLS OF QUANTITIES 1. The Bills of Quantities form part of the contract documents and are to be read in conjunction with the contract drawings and general specifications of materials and works. 2. The prices quoted shall be deemed to include for all obligations under the sub-contract including but not limited to supply of materials, labor, delivery to site, storage on site, installation, testing, commissioning and all taxes (including 16% VAT and all taxes applicable at the time of tender.) 3. All prices omitted from any item, section or part of the Bills of Quantities shall be deemed to have been included to another item, section or part. 4. The brief descriptions of the items given in the Bills of Quantities are for the purpose of establishing a standard to which the sub-contractor shall adhere to. Otherwise, alternative brands of equal and approved quality will be accepted. Should the sub-contractor install any material not specified here-in before receiving approval from the Project Manager, the sub-contractor shall remove the material in question and, at his own cost, install the proper material. 5. The grand total of prices in the price summary page must be carried forward to the Form of Tender. 6. Tenderers must enclose, together with their submitted tenders, detailed colored manufacturer’s Brochures detailing Technical Literature and specifications on all the equipment they intend to offer. 5 PROPOSED REHABILATION WORKS AT HYRAX HILL PREHISTORIC SITE ELECTRICAL INSTALLATION WORKS BILL NO.1: SUB-CONTRACT PRELIMINARIES ITEM DESCRIPTION QTY UNIT RATE SHS. 1 Discrepancies clause - Sub-contractor shall include all 1 Item work either shown on the Contract Drawings or detailed in the specification. No claim or extra cost shall be considered for works which has been shown on the drawings or in the specification alone. 2 Payments clause - Payment will be made through certificates to the Main Contractor, unless he specifically agrees to forego this right, in which case direct payment can be made to the Domestic Sub- contractor. All payments will be less retention as specified in the Main Contract. No payment will become due until materials are delivered to site. 1 Item 3 Insurance company fees clause - Attention is drawn to the tenderers to allow for all necessary fees, where known, that may be payable in respect of any fees imposed by Insurance Companies or statutory authorities for testing or inspection. 1 Item 4 Extent of contractors duties clause - The Sub- contractor shall be responsible for verifying all dimensions relative to his work by actual measurements taken on site.Shall mark accurately on one set of drawings and indicate all alterations and/or modifications carried out to the designed system during the construction period. This information must be made available on site for inspection by the Engineer. 1 Item 5 Government legislation and regulations clause - Subcontractor shall allow for providing holidays and transport for work people, and for complying with Legislation, Regulations and Union Agreements. The Sub-contractor must also make himself acquainted with current legislation and any Government regulations regarding the movement, housing, security and control of labour, labour camps, passes for transport, etc. 1 Item Sub Total carried to next page 6 AMOUNT SHS. QTY UNIT ITEM DESCRIPTION Sub-Total B/F from Previous Page 6 Samples and materials generally clause - The Subcontractor shall, when required, provide for approval at no extra cost, samples of all materials to be incorporated in the works. Such samples, when approved, shall be retained by the Engineer and shall form the standard for all such materials incorporated. 1 Item 7 Bills of quantities clause - All the Quantities are based on the Contract Drawings and are provisional and they shall not be held to gauge or to limit the amount or description of the work to be executed by the Sub- contractor but the value thereof shall be deducted from the Sub-contract Sum and the value of the work ordered by the Engineer and executed there under shall be measured and valued by the Engineer in accordance with the contract. All work liable to adjustment under this Sub-contract shall be left uncovered for a reasonable time to allow measurements needed for such adjustment to be taken by the Quantity Surveyor or Engineer. Immediately the work is ready for measuring the Sub- contractor shall give notice to the Quantity Surveyor or Engineer to carry out measurements before covering up. If the Sub-contractor shall make default in these respects he shall, if the Architect so directs, uncover the work to enable the necessary measurements to be taken and afterwards reinstate at his own expense. 1 Item 8 Scope of contract works clause - The sub-contractor shall supply, deliver, unload, hoist, fix, test, commission and hand-over in satisfactory working order the complete installations specified hereinafter and/or as shown on the Contract Drawings attached hereto, including the provision of labour, transport and plant for unloading material and storage, and handling into position and fixing 1 Item Sub Total carried to next page 7 RATE SHS. AMOUNT SHS. QTY UNIT ITEM DESCRIPTION Sub-Total B/F from Previous Page 9 Contractors office in Kenya clause - It shall be the Subcontractor’s responsibility to procure work permits, entry permits, licences, registration, etc., in respect of all expatriate staff. The Sub-contractor shall prepare a substantial proportion of his Working Drawings at his office in Kenya. No reasons for delays in the preparation or submission for approval or otherwise of such drawings or proposals will be accepted on the grounds that the Subcontractor’s Head Office is remote from his office in Nairobi or the site of the Sub- contract Works or otherwise. 1 Item 10 Identification of plant components clause - Sub-contractor shall supply and fix identification labels to all plant, starters, switches and items of control equipment etc with white traffolyte or equal labels engraved in red lettering denoting its name, function and section controlled. 1 Item 11 Working drawings clause - Sub-contractor shall prepare such Working Drawings as may be necessary. The Working Drawings shall be complete in such detail not only that the Sub-contract Works can be executed on site but also that the Engineer can approve the Subcontractor’s proposals, detailed designs and intentions in the execution of the Sub- contract Works. 1 Item 12 Records Drawings (As Installed) and instructions clause Record Drawings, will be subject to the approval of the Engineer, include approved Working Drawings adjusted as necessary and certified by the Sub-contractor as a correct record of the installation of the Sub-contract Works. 1 Item 13 Maintenance Manual clause - Upon Practical Completion of the Sub-contract Works, the Subcontractor shall furnish the Engineer four copies of a Maintenance Manual relating to the installation forming part of all of the Sub-contract Works. 1 Item Sub Total carried to next page 8 RATE SHS. AMOUNT SHS. QTY UNIT ITEM DESCRIPTION Sub-Total B/F from Previous Page 14 Hand over clause - The Sub-contract Works shall be considered complete and the Maintenance and Defects Liability Period shall commence only when the Subcontract Works and supporting services have been tested, commissioned and operated to the satisfaction of the Engineer and officially approved and accepted by the Employer, provided always that the handing over of the Sub-contract Works shall be coincident with the handing over of the Main Contract Works. 1 Item 15 Testing and inspection - manufactured plant clause - The Engineer reserves the right to inspect and test or witness of all manufactured plant equipment and materials. The right of the Engineer relating to the inspection, examination and testing of plant during manufacture. Subcontractor shall give two weeks’ notice to the Engineer of his intention to carry out any inspection or tests and the Engineer or his representative shall be entitled to witness such tests and inspections. 1 Item 16 Testing and inspection - installation clause - Allow for testing each section of the Sub-contract Works installation. 1 Item 17 Initial Maintenance Clause - The sub-contractor shall make routine maintenance once a month during the liability for the Defects Period and shall carry out all necessary adjustments and repairs, cleaning and oiling of moving parts. A monthly report of the inspection and any works done upon the installation shall be supplied to the Engineer. Shall allow in the sub-contract Sum of the initial maintenance, inspection and break-down service 1 Item Sub Total carried to next page 9 RATE SHS. AMOUNT SHS. QTY UNIT ITEM DESCRIPTION 18 Sub-Total B/F from Previous Page Local and other authorities notice clause - The contractor shall comply with and give all notices required by any Regulations, Act or by Law of any Local Authority or of any Public Service, Company or Authority who have any jurisdiction with regard to the works or with those systems the same are or will be connected and he shall pay and indemnify the Government against any fees or charges legally demandable under any regulation or by-law in respect of the works; provided that the said fees and charges if not expressly included in the contract sum or stated by way of provisional sum shall be added to the contract sum. 1 Item 19 Temporary Works clause - The contractor shall include for the cost of and make necessary arrangements with the Project Manager for such temporary works. 1 Item 20 Patent Rights clause - The contractor shall fully indemnify the Government of Kenya; against any action, claim or proceeding relating to infringement of any patent or design rights, and pay any royalties which may be payable in respect of any article or any part thereof, which shall have been supplied by the contractor to the Project Manager. 1 Item 21 Mobilization and Demobilization clause -No claim will be entertained where the contractor has not made any provision for mobilization and demobilization of labour, plant and equipment in the preliminary bills of quantities. 1 Item Sub Total carried to next page 10 RATE SHS. AMOUNT SHS. QTY UNIT ITEM DESCRIPTION RATE SHS. AMOUNT SHS. Sub-Total B/F from Previous Page 22 Supervision by Engineer and site meetings clause - A competent Project Engineer appointed by the Chief Engineer as his representative shall supervise the Contract works. The Project Engineer shall be responsible for issuing all the site instructions in any variations to the works and these shall be delivered through the Contractor with the authority of the Project Manager. Any instructions given verbal shall be confirmed in writing. The Sub Contractor shall in his tender allow for the provision of management meetings and site inspections, as instructed by the Engineer, and also profit and attendance on these funds. The funds shall be expended according to Project Manager’s instructions to the Contractor. 1 Item 23 Allow for VAT, Profit and Attendance for the above Item % Item 24 Contract obligation and employers obligation clause - No claims will be entertained for pre-financing of the project by the sub-contractor, or for loss of profit (expectation loss) in case of premature termination, reduction or increase of works as the sub-contractor shall be deemed to have taken adequate measures in programming his works and expenditure and taken necessary financial precaution while executing the works. 1 Item 25 Any other preliminaries 1 Item TOTAL C/F TO MAIN SUMMARY PAGE 11 60,000.00 60,000.00 BILL NO. 2 : SCHEDULE 1:ABLUTION BLOCK ELECTRICAL INSTALLATION WORKS DESCRIPTION ITEM QTY UNIT RATE AMOUNT SHS. SHS. Supply, Install, Test and commission the following: 1.01 1.02 1.03 LIGHTING POINTS 2 Lighting point wired in 3x1.5mm SC-PVC-Cu cables drawn in 20mm diameter HG PVC conduits concealed inside the ceiling complete with all necessary accessories excluding switches i) One way Switching 22 No. 10A moulded ivory switch plates as Crabtree or approved equivalent as follows: i) One gang One way switching ii) Two gang One way switching 2 5 No. No. a) 8Watts, 2 feet (L600), 800Lm LED Batten as philips or approved equivalent 16 No. b) Glass Rectangular Bulkhead Outdoor light 6 No. 1 No. 1 No 30 Lm. LIGHTING FITTINGS Light fittings complete with all accessories and lamps as follows:- CONSUMER UNIT 4 Ways SPN, flush mounted Consumer Unit completewith 100A 1.04 integral SPN isolator as Schneider or approved equivalent complete with all accessories but excluding MCBs. 1.05 Miniature Circuit Breakers to fit into the above consumer unit as follows: (i) 10A SP 1.06 SUB-MAINS CABLES 3 core 2.5mm² armored PVC copper cables burried in ground to Ablution Block CLB 1.07 Standard Cable Loop-in Box complete with 20A MCB (DP) mounted on a rail as schneider or approved equivalent. 1 No. 1.06 3x2.5mm² armored PVC copper cables in 32mm HG PVC Conduits from the Cable Loop in Box to the Consumer Unit 20 LM TOTAL C/F TO COLLECTION PAGE 12 ITEM 2.01 2.02 BILL NO. 2 : SCHEDULE 2: GATE HOUSE ELECTRICAL INSTALLATION WORKS DESCRIPTION QTY UNIT RATE AMOUNT SHS. SHS. Supply, Install, Test and commission the following: LIGHTING POINTS Lighting point wired in 3x1.5mm2 SC-PVC-Cu cables drawn in 20mm diameter HG PVC conduits concealed inside the ceiling complete with all necessary accessories excluding switches i) One way Switching 7 No. 10A moulded ivory switch plates as Crabtree or approved equivalent as follows: i) One gang One way switching 3 No. 1 No. 4 No. 1 No. 2 No. SOCKET OUTLETS Socket outlet point comprising wiring in 3x2.5mm2 PVC-SCCu cables in concealed in trunking/in conduit. 3 No. 13A switched twin socket outlet mounted on trunking as Crabtree or approved equivalent 3 No 1 No. ii) IP66 10A weather proof switch as schneider or equal and approved equivalent 2.03 LIGHTING FITTINGS Light fittings complete with all accessories and lamps as follows:a) IP65, Base type:E27, 90º Black Ornamental Outdoor Gate Lamp mounted 2 meters above the ground on the masonry column of the gate (two inside and two outside). b) 1200mm,19W, 2500lm, TrueLine Surface mounted as Philips TrueLine ceiling mounted or equal and approved equivalent. c) 8Watts, 2 feet (L600), 800Lm LED Batten as philips or approved equivalent 2.04 2.05 CONSUMER UNIT 4 Ways SPN, flush mounted Consumer Unit completewith 2.06 100A integral SPN isolator as Schneider or approved equivalent complete with all accessories but excluding MCBs. Sub total carried to next page 13 ITEM QTY UNIT RATE SHS. DESCRIPTION Sub total carried from previous page 2.07 Miniature Circuit Breakers to fit into the above consumer unit as follows: (i) 10A SP (ii) 32A SP 1 1 No No SOLAR POWER 2.08 Solar Panel 575 watts c/w solar connecting cables 2 No. 2.09 12VDC, 200AH deep cycle AGM Solar batteries (Maintenance Free) c/w battery connector/cables and mounting structure 2 No. 2.10 850 watts hybrid inverter with inbuilt charge controller 1 No. SUB-MAINS CABLES 2.11 3x2.5mm² SC PVC/PVC copper cables strapped on a cable tray/ inside an electrical duct . 50 LM Item Item 2.12 Any other items necessary to complete the above installation as per the system you propose to install. a) b) TOTAL C/F TO COLLECTION PAGE 14 AMOUNT SHS. BILL NO. 2 : SCHEDULE 3:SERVANT QUARTERS ELECTRICAL INSTALLATION WORKS DESCRIPTION ITEM QTY UNIT RATE AMOUNT SHS. SHS. Supply, Install, Test and commission the following: 3.01 3.02 3.03 LIGHTING POINTS Lighting point wired in 3x1.5mm2 SC-PVC-Cu cables drawn in 20mm diameter HG PVC conduits concealed inside the ceiling complete with all necessary accessories excluding switches i) One way Switching 8 No. 10A moulded ivory switch plates as Crabtree or approved equivalent as follows: i) One gang One way switching 4 No. 4 No. 4 No. LIGHTING FITTINGS Light fittings complete with all accessories and lamps as follows:a) 1200mm,19W, 2500lm, TrueLine Surface mounted as Philips TrueLine ceiling mounted or equal and approved equivalent. b) Glass Rectangular Bulkhead Outdoor light 3.04 SOCKET OUTLETS Socket outlet point comprising wiring in 3x2.5mm2 PVC-SCCu cables in concealed in trunking/in conduit. 5 No. 3.05 13A switched twin socket outlet mounted on trunking as Crabtree or approved equivalent 5 No 1 No. 1 1 No No 50 LM CONSUMER UNIT 3.06 4 Ways SPN, flush mounted Consumer Unit completewith 100A integral SPN isolator as Schneider or approved equivalent complete with all accessories but excluding MCBs. 3.07 3.08 Miniature Circuit Breakers to fit into the above consumer unit as follows: (i) 10A SP (ii) 32A SP SUB-MAINS CABLES 3 core 4mm² armored PVC copper cables burried in ground from the existing meterboard to Cable Loop in Box at the SQ Sub total carried to next page 15 ITEM DESCRIPTION QTY UNIT RATE AMOUNT . SHS. SHS. Sub-Total B/F from Previous Page 3.09 3x2.5mm² armored PVC copper cables in 32mm HG PVC Conduits from the Cable Loop in Box to the Consumer Unit 20 Lm. 3.10 Standard Cable Loop-in Box complete with 32A MCB (DP) mounted on a rail as schneider or approved equivalent. 1 No. 3.11 Excavate trenches for the above duct average depth 600mm, remove soft earth, lay duct, cover with "DANGER-HATARI" tape, back-fill with soil and compact to natural ground level and to KPLC approved design layout. 50 Lm. 3.12 600x600x600mm Power manhole, PMH complete with E.A.F.W heavy duty steel cover engraved POWER- DANGER 4 No. TOTAL C/F TO COLLECTION PAGE 16 BILL NO. 2 : SCHEDULE 4: TICKETING OFFICE ELECTRICAL INSTALLATION WORKS DESCRIPTION ITEM QTY UNIT RATE AMOUNT SHS. SHS. Supply, Install, Test and commission the following: 4.01 4.02 4.03 4.04 4.05 LIGHTING POINTS 2 Lighting point wired in 3x1.5mm SC-PVC-Cu cables drawn in 20mm diameter HG PVC conduits concealed inside the ceiling complete with all necessary accessories excluding switches i) One way Switching 1 No. 10A moulded ivory switch plates as Crabtree or approved equivalent as follows: i) One gang One way switching 1 No. a) 1200mm,19W, 2500lm, TrueLine Surface mounted as Philips TrueLine ceiling mounted or equal and approved equivalent. 1 No. b) Glass Rectangular Bulkhead Outdoor light 4 No. SOCKET OUTLETS Socket outlet point comprising wiring in 3x2.5mm2 PVC-SC-Cu cables in concealed in trunking/in conduit. 3 No. 13A switched twin socket outlet mounted on trunking as Crabtree or approved equivalent 3 No 1 No. 1 2 No No LIGHTING FITTINGS Light fittings complete with all accessories and lamps as follows:- CONSUMER UNIT 4.06 4 Ways SPN, flush mounted Consumer Unit completewith 100A integral SPN isolator as Schneider or approved equivalent complete with all accessories but excluding MCBs. 4.07 Miniature Circuit Breakers to fit into the above consumer unit as follows: (i) 10A SP (ii) 32A SP TOTAL C/F TO COLLECTION PAGE 17 BILL NO. 2 : SCHEDULE 5: GALLERY ELECTRICAL INSTALLATION WORKS DESCRIPTION ITEM QTY UNIT RATE SHS. Supply, Install, Test and commission the following: 5.01 5.02 5.03 LIGHTING POINTS Lighting point wired in 3x1.5mm2 SC-PVC-Cu cables drawn in 20mm diameter HG PVC conduits concelaed inside ceiling and steel galvanised conduits to switching outlet box complete with all necessary accessories excluding switches i) One way Switching ii) Two way Switching 8 2 No. No. 10A moulded ivory switch plates as Crabtree or approved equivalent as follows: i) One gang One way switch ii) One gang Two way switch iii) Intermediate switch 6 2 1 No. No. No. a) 1200mm,19W, 2500lm, TrueLine Surface mounted as Philips TrueLine ceiling mounted or equal and approved equivalent. 10 No. b) Glass Rectangular Bulkhead Outdoor light 4 No. LIGHTING FITTINGS Light fittings complete with all accessories and lamps as follows:- SOCKET OUTLETS 5.04 Socket outlet point comprising wiring in 3x2.5mm2 PVC-SCCu cables in concealed in 32mm galvanised steel conduit complete with all necessary accessories excluding sockets. 17 No. 5.05 13A switched twin socket outlet mounted on trunking as Crabtree or approved equivalent 17 No 1 No. 1 1 No No CONSUMER UNIT 5.06 5.07 4 Ways SPN, flush mounted Consumer Unit completewith 100A integral SPN isolator as Schneider or approved equivalent complete with all accessories but excluding MCBs. Miniature Circuit Breakers to fit into the above consumer unit as follows: (i) 10A SP (ii) 32A SP Sub total carried to next page 18 AMOUNT SHS. ITEM DESCRIPTION QTY UNIT RATE . SHS. Sub-Total B/F from Previous Page METER BOX 5.08 IP46 powder coated (L30W30H15) cm lockable meter box with space to house 1No. Single phase meters, space to accommodate 4No. MCB (DP) outgoers TOTAL C/F TO COLLECTION PAGE 19 1 No. AMOUNT SHS. ITEM 6.01 BILL NO. 2 : SCHEDULE 6: AREA LIGHTING INSTALLATION WORKS DESCRIPTION QTY UNIT RATE AMOUNT SHS. SHS. Supply, Install, Test and commission the following: AREA LIGHTING COLUMNS LIGHTING COLUMNS 6m rooted galvanized steel column powder coated, stepped (with decorative waist finial) , complete with 60mm Spigot designed to the EN40 as Thorn PLURIO columns and brackets or equal and approved equivalent. No. 5 6.02 Brackets to be used on the above able to mount four flood lights together with four solar panels No. 5 6.03 9m rooted galvanized steel column powder coated, stepped (with decorative waist finial) , complete with 60mm Spigot designed to the EN40 as Thorn PLURIO columns and brackets or equal and approved equivalent. No. 2 6.04 Brackets to be used on the above able to mount four flood lights together with four solar panels No. 2 6.05 Allow for Earthing. The contractor to ensure that the earth resistance does not exceed 10 Ohms. Item 7 6.06 Excavate holes to a depth of 1000mm by L600mm by W600mm to take area/security light poles and backfill after installation of the poles No. 7 6.07 Mix and place 1:3:6 concrete pad at the base of every pole No. 7 6.08 LIGHTING FITTINGS 200 W, 4188lm, 6500K LED solar flood lights with street No. distribution. Class I electrical, IP66, IK08 as Thorn Avenue F2 LED or equal and approved equivalent TOTAL C/F TO SUMMARY PAGE 20 28 SUMMARY PAGE Item Description 1.00 BILL NO.1: SUB-CONTRACT PRELIMINARIES 2.00 BILL NO. 2 : SCHEDULE 1: ABLUTION BLOCK ELECTRICAL INSTALLATION WORKS 3.00 BILL NO. 2 : SCHEDULE 2: GATE HOUSE ELECTRICAL INSTALLATION WORKS 4.00 BILL NO. 2 : SCHEDULE 3:SERVANT QUARTERS ELECTRICAL INSTALLATION WORKS 5.00 BILL NO. 2 : SCHEDULE 4: TICKETING OFFICE ELECTRICAL INSTALLATION WORKS 6.00 BILL NO. 2 : SCHEDULE 5: GALLERY ELECTRICAL INSTALLATION WORKS 7.00 BILL NO. 2 : SCHEDULE 6: AREA LIGHTING INSTALLATION WORKS 8.00 CONTIGENCY SUM Amount (Ksh) 100,000.00 GRAND TOTAL C/F TO MAIN SUMMARY (VAT INCLUSIVE) TOTAL AMOUNT IN WORDS TENDERER'S NAME & STAMP( DOMESTIC SUB CONTRACTOR) SIGNATURE ………………………………… DATE……………………………………...….. P.I.N No.…………………………………V.A.T CERTIFICATE No………………………. WITNESS………………………………………………... SIGNATURE OF WITNESS……………………...…DATE………………………………… 21 SECTION II - SPECIFICATIONS Notes for preparing Specifications 1. Specifications must be drafted to present a clear and precise statement of the required standards of materials, and workmanship for tenderers to respond realistically and competitively to the requirements of the Procuring Entity and ensure responsiveness of tenders. The Specifications should require that all materials, plant, and other supplies to be permanently incorporated in the Works be new, unused, of the most recent or current models, and incorporating all recent improvements in design and materials unless provided otherwise in the Contract. Where the Contractor is responsible for the design of any part of the permanent Works, the extent of his obligations must be stated. 2. Specifications from previous similar projects are useful and may not be necessary to re-write specifications for every Works Contract. 3. There are considerable advantages in standardizing General Specifications for repetitive Works in recognized public sectors, such as high ways, urban housing, irrigation and water supply. The General Specifications should cover all classes of workmanship, materials and equipment commonly involved in constructions, although not necessarily to be used in a particular works contract. Deletions or addenda should then adapt the General Specifications to the particular Works. 4. Care must be taken in drafting Specifications to ensure they are not restrictive. In the Specifications of standards for materials, plant and workmanship, existing Kenya Standards should be used as much as possible, otherwise recognized international standards may also be used. 5. The Procuring Entity should decide whether technical solutions to specified parts of the Works are to be permitted. Alternatives are appropriate in cases where obvious (and potentially less costly) alternatives are possible to the technical solutions indicated in tender documents for certain elements of the Works, taking into consideration the comparative specialized advantage of potential tenderers. 6. The Procuring Entity should provide a description of the selected parts of the Works with appropriate reference to Drawings, Specifications, Bills of Quantities, and Design or Performance criteria, stating that the alternative solutions shall be at least structurally and functionally equivalent to the basic design parameters and Specifications. 7. Such alternative solutions shall be accompanied by all information necessary for a complete evaluation by the Procuring Entity, including drawings, design calculations, technical specifications, breakdown of prices, proposed construction methodology, and other relevant details. Technical alternatives permitted in this manner shall be considered by the Procuring Entity each on its own merits and independently of whether the tenderer has priced the item as described in the Procuring Entity's design included with the tender documents. 22 A. GENERAL SPECIFICATIONS 1.1 General 1.2 Standard of Materials 1.3 Workmanship 1.4 Procurement of Materials 1.5 Shop Drawings 1.6 Record Drawings 1.7 Regulations and Standards 1.8 Setting out Works 1.9 Position of Electrical Plant and Apparatus 1.10 M.C.B Distribution Panels and Consumer Units 1.11 Fused Switchgear and Isolators 1.12 Conduits and Conduit Runs 1.13 Conduit Boxes and Accessories 1.14 Labels 1.15 Earthing 1.16 Cables and Flexible Cords 1.17 Armored PVC Insulated and Sheathed Cables 1.18 Cable Supports; Markers and Tiles 1.19 PVC Insulated Cables 1.20 Heat Resisting Cables 1.21 Flexible Cords 1.22 Cable Ends and phase Colors 1.23 Cable Insulation Colors 23 1.24 Sub-circuit Wiring 1.25 Space Factor 1.26 Insulation 1.27 Lighting Switches 1.28 Sockets and Switched sockets 1.29 Fused Spur Boxes 1.30 Cooker Outlets 1.31 Connectors 1.32 Lamp holders 1.33 Lamps 1.34 lighting Fittings Street lighting Lanterns 1.35 Position of Points and Switches 1.36 Street/Security Lighting Columns 1.37 Timing Control Switch 1.38 Wiring System for Street Lighting 1.39 Metal control Pillar 1.40 Current Operated Earth leakage circuit breaker 1.41 MV Switchboard 1.42 Steel Conduits and Steel Trunking 1.43 Testing on Site 24 1.1. GENERAL This specification is to be read in conjunction with the drawings which are issued with it. Bills of quantities shall be the basis of all additions and omissions during the progress of the works. 1.2. STANDARD OF MATERIALS Where the material and equipment are specifically described and named in the Specification followed by approved equal, they are so named or described for the purpose of establishing a standard to which the sub-contractor shall adhere. Should the Sub-contractor install any material not specified herein before receiving approval from the proper authorities, the Engineer shall direct the Sub-contractor to remove the material in question immediately. The fact that this material has been installed shall have no bearing or influence on the decision by the Engineer. All materials condemned by the Engineer as not approved for use, are to be removed from the premises and suitable materials delivered and installed in their place at the expense of the Sub-contractor. All materials required for the works shall be new and the best of the respective kind and shall be of a uniform pattern. 1.3. WORKMANSHIP The workmanship and method of installation shall conform to the best standard practice. All work shall be performed by a skilled tradesman and to the satisfaction of the Engineer. Helpers shall have qualified supervision. Any work that does not in the opinion of the Engineer conform to the best standard practice will be removed and reinstated at the Sub-contractors expense. Permits, Certificates or Licenses must be held by all tradesmen for the type of work; in which they are involved where such permits, certificates or licenses exist under Government legislation. 1.4. PROCUREMENT OF MATERIALS The sub-contractor is advised that no assistance can be given in the procurement or allotment of any materials or products to be used in and necessary for the construction and completion of the work. Sub-contractors are warned that they must make their own arrangements for the supply of materials and/or products specified or required. 1.5. SHOP DRAWINGS Before manufacture or Fabrication is commenced the sub-contractor shall submit Two copies of detailed drawings of all control pillars, meter cubicles, medium voltage switchboards including their components showing all pertinent information including sizes, capacities, construction details, etc, as may be required to determine the suitability of the equipment for the approval of the Engineer. Approval of the detailed drawings shall not relieve the subcontractor of the full responsibility of errors or the necessity of checking the drawings himself or of furnishing the materials and equipment and performing the work required by the plans and specifications. 25 1.6. RECORD DRAWINGS These diagrams and drawings shall show the completed installation including sizes, runs and arrangements of the installation. The drawings shall be to scale not less than 1:50 and shall include plan views and section. The drawings shall include all the details which may be useful in the operation, maintenance or subsequent modifications or extensions to the installation. Three sets of diagrams and drawings shall be provided, all to the approval of the Engineer. One coloured set of line diagrams relating to operating and maintenance instructions shall be framed and, mounted in a suitable location. 1.7. REGULATIONS AND STANDARDS All work executed by the contractor shall comply with the current edition of the “Regulations” for the Electrical Equipment of Buildings, issued by the Institution of Electrical Engineers, Electric Power Act, Kenya Bureau of Standards (KEBS), Institution of Electrical Engineers (I.E.E) Wiring Regulations, Current recommendation of CCITT and CCIR, and with the Regulations of the Local Electricity Authority and the Communications Authority of Kenya (CA) Where the two sets of regulations appear to conflict, they shall be clarified with the Engineers. All materials used shall comply with relevant Kenya Bureau of Standards Specification. 1.8. SETTING OUT WORK The sub-contractor at his own expenses; is to set out works and take all measurements and dimensions required for the erection of his materials on site; making any modifications in details as may be found necessary during the progress of the works, submitting any such modifications or alterations in detail to the Engineer before proceeding and must allow in his Tender for all such modifications and for the provision of any such sketches or drawings related thereto. 1.9. POSITIONS OF ELECTRICAL PLANT AND APPARATUS The routes of cables and approximate positions of switchboards etc, as shown on the drawings shall be assumed to be correct for purpose of Tendering, but exact positions of all electrical Equipment and routes of cables must be agreed on site with the Engineer before any work is carried out. 1.10. MCB DISTRIBUTION PANELS AND CONSUMER UNITS All cases of MCB Panels and consumer units shall be constructed in heavy gauge sheet with hinged covers. Removable undrilled gland plates shall be provided on the top and bottom of the cases. Miniature circuit breakers shall be enclosed in moulded plastic with the tripping mechanism and arc chambers separated and sealed from the cable terminals. The operating dolly shall be tripfree with a positive movement in both make and break position. Clear indication of the position of the handle shall be incorporated. The tripping mechanism shall be on inverse characteristic to prevent tripping in temporary 26 overloads and shall not be affected by normal variation in ambient temperature. A locking plate shall be provided for each size of breaker; A complete list of circuit details on typed cartridge paper glued to stiff cardboards and covered with a sheet of perspex, and held in position with four suitable fixings, shall be fitted to the inner face of the lids of each distribution panel. The appropriate MCB ratings shall be stated on the circuit chart against each circuit in use: Ivorine labels shall be secured to the insulation barriers in such a manner as to indicate the number of the circuits shown on the circuit chart. Insulated barriers shall be fitted between phases, and neutrals in all boards, and to shroud live parts. Neutral cables shall be connected to the neutral bar in the same sequence as the phase cables are connected to the MCB’s. This shall also apply to earth bars when installed. 1.11. FUSED SWITCHGEAR AND ISOLATORS All fused switchgear and isolators whether mounted on machinery, walls or industrial panels shall conform to the requirements of KS 04 – 226 PART: 1: 1985. All contacts are to be fully shrouded and are to have a breaking capacity on manual operations as required by KS 04 – 182: 1980. Fuse links for fused switches are to be of high rupturing capacity cartridge type, conforming to KS 04 – 183: 1978. Isolators shall be load breaking/fault making isolators. Fused switches and isolators are to have separate metal enclosures. Mechanical interlocks are to be provided between the door and main switch operating mechanism so arranged that the door may not be opened with the switch in the ‘ON’ position. Similarly; it shall not be possible to close the switch with the door open except that provision to defeat the mechanical interlock and close the switch with the door in the open position for test purposes. The ‘ON’ and ‘OFF’ positions of all switches and isolators shall be clearly indicated by a mechanical flag indicator or similar device. In T.P & N fused switch units, bolted neutral links are to be fitted. 1.12. CONDUITS AND CONDUIT RUNS Conduit systems are to be installed so as to allow the loop-in system of wiring: All conduits shall be black rigid super high impact heavy gauge class ‘A’ PVC in accordance with KS 04 – 179: 1988 and IEE Regulations. No conduit less than 20mm in diameter shall be used anywhere in this installation. Conduit shall be installed buried in plaster work and floor screed except when run on wooden or metal surface when they will be installed surface supported with saddles every 600mm. Conduit run in chases shall be firmly held in position by means of substantial pipe hooks driven into wooden plugs. The Sub-contractors attention is drawn to the necessity of keeping all conduits entirely separate from other piping services such as water and no circuit connections will be permitted between conduits and such pipes. All conduits systems shall be arranged wherever possible to be self-draining to switch boxes and conduit outlet points for fittings: The systems, when installed and before wiring shall be kept plugged with well-fitting plugs 27 and when short conduit pieces are used as plugs, they shall be doubled over and tied firmly together with steel wire; before wiring all conduit systems shall be carried out until the particular section of the conduit installation is complete in every respect. The sets and bends in conduit runs are to be formed on site using appropriate size bending springs and all radii of bends must not be less than 2.5 times the outside diameter of the conduit. No solid or inspection bends, tees or elbows will be used. Conduit connections shall either be by a demountable (screwed up) assembly or adhesive fixed and water tight by solution. The tube and fittings must be clean and free of all grease before applying the adhesive. When connections are made between the conduit and switch boxes, circular or non-screwed boxes, care shall be taken that no rough edges of conduit stick out into the boxes. Runs between draw in boxes are not to have more than two right angle bends or their equivalent. The sub-contractor may be required to demonstrate to the Engineers that wiring in any particular run is easily withdrawable and the sub-contractor may, at no extra cost to the contract; be required to install additional draw-in boxes required. If conduit is installed in straight runs in excess of 6000mm, expansion couplings as manufactured by Egatube shall be used at intervals of 6000mm. Where conduit runs are to be concealed in pillars and beams, the approval of the Structural Engineer, shall be obtained. The sub-contractor shall be responsible for marking the accurate position of all holes chases etc, on site, or if the Engineer so directs, shall provide the Main Contractor with dimensional drawings to enable him to mark out and form all holes and chases. Should the sub-contractor fail to inform the main contractor of any inaccuracies in this respect they shall be rectified at the sub-contractors expense. It will be the Sub-contractors responsibility to ascertain from site, the details of reinforced concrete or structural steelwork and check from the builder’s drawings the positions of walls, structural concrete and finishes. No reinforced concrete or steelwork may be drilled without first obtaining the written permission of the Structural Engineer. The drawings provided with these specifications indicate the appropriate positions only of points and switches, and it shall be the Sub-Contractors responsibility to mark out and centre on site the accurate positions where necessary in consultation with the Architect and the Engineer. The sub-contractor alone shall be responsible for the accuracy of the final position. 1.13. CONDUIT BOXES AND ACCESSORIES All conduit outlets and junction boxes are to be either malleable iron and of standard circular pattern of the appropriate type to suit saddles being used or super high impact PVC manufactured to KS 04 – 179 : 1983. Small circular pattern boxes are to be used with conduits up to and including 25mm outside diameter. Rectangular pattern adaptable boxes are to be used for conduits of 32mm outside diameter and larger. For drawing in of cables in exposed runs of conduit, standard pattern through boxes are to be used: Boxes are to be not less than 50mm deep and of such dimensions as will enable the largest appropriate number of cables for the conduit sizes to be drawn in without excessive bending. Outlet boxes for lighting fittings are to be of the loop-in type where conduit installation is concealed and the sub-contractor shall allow one such box per fitting, except where fluorescent fittings are specified when two such boxes per fitting shall be fitted flush with 28 ceiling and if necessary fitted with break joint rings. Pattresses shall be fitted where required to outlets on surface conduit runs. Adaptable boxes are of PVC or mild steel (of not less than 12swg) and black enameled or galvanized finish according to location. They shall be of square or oblong shape location. They shall be of square or oblong shape complete with lids secured by four 2 BA brass roundhead screws; No adaptable box shall be less than 75mm x 75mm x 50mm or larger than 300mm x 300mm x 75mm and shall be adequate in depth in relation to the size of conduit entering it. Conduits shall only enter boxes by means of conduit bushes. 1.14. LABELS Labels fitted to switches and fuseboards;(i) Shall be Ivorine engraved black on white. (ii) Shall be secured by R.H brass screws of same manufacturing throughout. (iii) a) Shall be indicated on switches:Reference number of switch b) Special current rating c) Item of equipment controlled (iv) a) b) c) d) Shall indicate on MCB panels Reference number Type of board, i.e; lighting, sockets, etc, Size of cable supplying panel where to isolate feeder cable (v) Shall be generally not less than 75mm x 50mm. 1.15. EARTHING The earthing of the installation shall comply with the following requirements;(i) It shall be carried out in accordance with the appropriate sections of the current edition of the Regulations, for the Electrical Equipment of Buildings issued by Institute of Electrical Engineers of Great Britain. (ii) At all main distribution panels and main service positions a 25mm x 3mm minimum cross sectional area Copper tape shall be provided and all equipment including the lead sheath and armoring of cables, distribution boards and metal frames shall be bonded thereto. The earth tape in Sub-clause (ii) shall be connected by means of a copper tape or cable of suitable cross sectional area to an earth electrode which shall be a copper earth rod (see later sub-clause). (iii) (iv) All tapes to be soft high conductivity copper, untinned except where otherwise specified and where run underground on or through walls, floors, etc., it shall be served with corrosion resisting tape or coated with corrosion compound and braided (v) Where the earth electrode is located outside the building a removable test link shall be provided inside the building as near as possible to the point of entry to the tape, 29 for isolating the earth electrode for testing purposes. (vi) Earthing of sub-main equipment shall be deemed to be satisfactory where the submain cables are M.I.C.S. or conduit with separate earth wire, and installation is carried out in accordance with the figures stated in the current edition of the I.E.E Regulations. (vii) Where an earth rod is specified (see Sub-clause (iii) it shall be proprietary manufacture, solid hand drawn copper of 15mm diameter driven into the ground to a minimum depth of 3.6M. It shall be made up to 1.2m sections with internal screw and socket joints and fitted with hardened steel tip and driving cap. (viii) Earth plates will not be permitted (ix) Where an earth rod is used the earth resistance shall be tested in the manner described in the current edition of the IEE Regulations, by the Sub-Contractor in the presence of the Engineer and the Sub-Contractor shall be responsible for the supply of all test equipment. (x) Where copper tape is fixed to the building structure it shall be by means of purpose made non-ferrous saddles which space the conductor away from the structure a minimum distance of 20mm. Fixings, shall be made using purpose made plugs; No fixings requiring holes to be drilled through the tape will be accepted. (xi) Joints in copper tape shall be tinned before assembly riveted with a minimum of two copper rivets and seated solid. (xii) Where holes are drilled in the earth tape for connection to items of equipment the effective cross sectional area must not be less than required to comply with the IEE regulations. (xiii) Bolts, nuts and washers for any fixing to the earth tape must be of non-ferrous material. (xiv) Attention is drawn to the need for the earthing metal parts of lighting fittings and for bonding ball joint suspension in lighting fittings. 1.16. CABLES AND FLEXIBLE CORDS All cables used in this Sub-Contract shall be manufactured in accordance with the current appropriate Kenya standard Specification which are as follows:P.V.C. Insulated Cables and Flexible Cords --Ks 04-192:1988 P.V.C Insulated Armored Cables --- Ks 04-194:1990 Armoring of Electric cables --- Ks 04-290:1987 The successful Sub-Contractor will, at the Engineers discretion be required to submit samples of cables for the Engineers approval; the Engineer reserves the right to call for the cables of an alternative manufacture without any extra cost being incurred. P.V.C. insulated cables shall be 500/1000-volt grade. No cables smaller than 1.5mm² shall be used unless otherwise specified. The installation and the finish of cables shall be as detailed in later clauses. The color of cables shall conform to the details stated in the “Cable Braid and insulation Colors” Clause. 30 1.17. ARMOURED P.V.C. INSULATED AND SHEATHED CABLES: Shall be 600/1000-volt grade manufactured to Ks 04-194:1988 and Ks 04-187/188 with copper stranded conductors. The wire armor of the cable shall be used wholly as an earth continuity conductor and the resistance of the wire armor shall have a resistance not more than twice of the largest current carrying conductor of the cable. P.V.C./S.W.A./P.V.C. cables shall be terminated using “Telecom” “B” type or approved equal or approved equal glands and a P.V.C. tapered sleeve shall be provided to shroud each gland. 1.18. CABLE SUPPORTS, MARKERS AND TILES All PVC/SWA/PVC cables run inside the building shall be fixed in rising ducts or on ceilings by means of die cast cable hooks or clamps, of appropriate size to suit cables, fixed by studs and back nuts to their channel sections. Alternatively, fixing shall be by BICC claw type cleating system with die-cast cleats and galvanized mild steel back straps or similar approved equal method. For one or two cables run together the cleats shall be fixed a special channel section supports or backstraps described above which shall in turn be secured to walls or ceilings of ducts by raw bolts. In excessively damp or corrosive atmospheric conditions special finishes may be required and the Sub-contractor shall apply to the Engineer for further instructions before ordering cleats and channels for such areas. The above type of hooks and clamps and channels or cleats and black-straps shall also be used for securing cables in vertical ducts. Cables supports shall be fixed at 600mm maximum intervals, the supports being supplied and erected under this Sub-contract. Saddles shall not be used for supporting cables nor any other type of fixing other than one of the two methods described above or other system which has received prior approval of the Engineer; Cables are to be kept clear of all pipe work and the Sub-contractor shall work in close liaison with other services Sub-contractors. The Sub-Contractor shall include for the provision of fixing of approved type colored slip on cables end markers to indicate permanently the correct phase and neutral colors on all ends. Provision shall be made for supplying and fixing approved non-corrosive metal cable markers to be attached to the outside of all PVC/SWA/PVC cables at 15mm intervals indicating cable size and distinction. Where PVC/SWA/PVC cables are outside the building they shall be laid underground 750mm deep with protecting concrete interlocking cover tiles laid over which shall be provided and laid under this Sub-contract. All necessary excavations and reinstatement of ground including sanding or trenches will be carried out by the Sub-Contractor, unless otherwise stated. 31 1.19. PVC INSULATED CABLES Shall be of non-braided type as CMA reference 6491 x 600/1000/1000 volt grade cables, or equal approved. PVC cables shall conform to the details of the “Cables and Flexible cords” and “Cable Braid and Insulation Colors” clauses. 1.20. HEAT RESISTING CABLES Final connections to cookers, water heaters, etc., shall be made using butyl rubber insulated cable as CMA reference 610 butyl (Single core 600/1000 Volt). This type of cable shall be used in all instances where a temperature exceeding 100°F, but not exceeding 150°F is likely to be experienced. Final connections to all lighting fittings (and other equipment where a temperature in excess of 150°c likely to be experienced) shall be made using silicon rubber insulated cable or equal and approved. 1.21. FLEXIBLE CORDS Shall be in accordance with the “Cable and Flexible Cords” clause. No cord shall be less than 24/0.2mm in size unless otherwise specified. Circular white twin TRS flex shall be used for plain pendant fittings up to 100 watts. For all other types of lighting fittings, the flexible cable shall be silicone rubber insulated. No polythene insulated flexible cable shall be used in any lighting fitting or other appliance (see “Heat Resisting Cables” Clause 30). 1.22. CABLE ENDS AND PHASE COLOURS All cable ends connected up in switchgear, MCB panels etc;, shall have the insulation carefully cut back and the ends sealed with Hellerman rubber slip on cable end markers. The markers shall be of appropriate phase color for switch and all other live feeds to the details of the “Cable Insulation Colors” clause. Black cable with black end markers shall only be used for neutral cables. 1.23. CABLE INSULATION COLOURS Unless otherwise stated in later clauses the insulation colors shall be in accordance with the following table. Where other systems are installed the cable colors shall be in accordance with the details stated in the appropriate clause. 1. SYSTEM CABLE END INSULATION COLOUR MARKER 1) Main and Sub-Main a) Phase Red Red b) Neutral Black Black 32 2) Sub-Circuits Single Phase a) Phase b) Neutral Red Red Black Black 1.24. SUB-CIRCUIT WIRING For all lighting and sockets wiring shall be carried out in the “looping in” system and there shall be no joints whatsoever. No lighting circuits shall comprise more than 20 points when protected by 10A MCB. Cables with different cross-section area of copper shall not be used in combination. Lighting circuits P.V.C. cable. (i) 1.5mm² for all lighting circuits indicated on the drawing. Power circuits P.V.C cable (minimum sizes). (ii) 2.5mm² for one, two or three 5Amp sockets wired in parallel. (iii) 2.5mm² for one 15Amp socket. (iv) 2.5mm² for maximum of ten switched 13 Amp sockets wired from 30 Amp MCB. The wiring sizes for lighting circuits and sockets are shown on the drawings. In such cases, the sizes shown on the drawings shall prevail over the sizes specified. Wiring sizes for other appliances shall be shown on the drawing or specified in later clauses of this specification. 1.25. SPACE FACTOR The maximum number of cables that may be accommodated in a given size of conduit or trunking or duct is not to exceed the number in Tables B.5 and B.6 or as stated in Regulation B.91, B.117 and B.118 of the I.E.E Regulations whichever is appropriate. 1.26. INSULATION The insulation resistance to earth and between poles of the whole wiring system, fittings and lumps, shall not be less than the requirements of the latest edition of the I.E.E Regulations. Complete tests shall be made on all circuits by the Sub-contractor before the installations are handed over. A report of all tests shall be furnished by the Sub-Contractor to the Engineer. The Engineer will then check test with his own instruments if necessary. 1.27. LIGHTING SWITCHES These shall be mounted flush with the walls, shall be contained in steel or alloy boxes and shall be of the gangs’ ratings and type shown in the drawings. They shall be as manufactured by M.K. Electrical Ltd., or other equal and approved to KS 04 – 247: 1988 33 1.28. SOCKETS AND SWITCHED SOCKETS These shall be flush pattern in steel/pvc box and shall be of the gangs and type specified in the drawings. They shall be 13- Amp, 3-pin, shuttered, switched and as manufactured by “M.K. Electrical Co. Ltd.”, or other approved equal to KS 04 – 246:-. FUSED SPUR BOXES These shall be flush, D.P switched as in steel/pvc box and of type and make specified in the drawings complete with pilot light and as manufactured by “M. K. Electrical Company Ltd”, or other approved equal. KS 04 – 247:-. COOKER OUTLETS These shall be flush mounted with 13-A switched socket outlet and neon indicator Lamps. The cooker control units shall be as manufactured by “M.K. Electrical Company Ltd”, or other approved equal KS 04 – 247:-. CONNECTORS Shall be specified in the drawings and appropriate rating. These shall be fitted at all conduit box lighting point outlets for jointing of looped P.V.C cables with flexible cables of specified quality. 1.32. LAMPHOLDERS Shall be of extra heavy H.O skirted and shall be provided for every specified lighting fitting and shall be B.C;, E.S;, or G.E.S as required. All E.S. and G.E.S. holders shall be heavy brass type (except for plain pendants where the reinforced bakelite type shall be used). The screwed cap of the E.S and G.E.S. holders shall be connected to the neutral. Where lampholders are supported by flexible cable, the holders shall have “cord grip” arrangements and in the case of metal shades earthing screws shall be provided on each of the holders. The Sub-Contractor must order the appropriate type of holder when ordering lighting fittings, to ensure that the correct types of holders are provided irrespective of the type normally supplied by the manufacturers. 1.33. LAMPS All lamps shall be suitable for normal stated supply voltage and the number and sizes of lamps detailed on the drawings shall be supplied and fixed. The Sub-Contractor must verify the actual supply voltage with the supply authority before ordering the lamps. Tungsten filament lamps shall be manufactured in accordance with KS 04 – 112:1978 for general service lamps and KS 04 – 307:1985 for lamps other than general services. Tubular fluorescent lamps shall comply with KS 04 – 464:1982 Pearl lamps shall be used in all fittings unless otherwise specified. 34 1.34. LIGHTING FITTINGS AND STREET LIGHTING LANTERNS This Sub-Contract shall include for the provision, handling charges, taking the delivery, safe storage, wiring (including internal wiring) assembling and erecting of all lighting fittings shown on the drawings. All fittings and pendants shall be fixed to the conduit boxes with brass R/H screws. These to be in line with metal finish of fittings. The lighting fittings are detailed for the purpose of establishing a high standard of finish and under no circumstances will substitute fittings be permitted. In case of rectangular shaped ceiling fittings, the extreme ends of the fittings shall be secured to suitable support in addition to the central conduit box fittings. Supports shall be provided and fixed by the Sub-Contractor. The whole of the metal work of each lighting fittings shall be effectively bonded to earth. In the case of ball and/or knuckle joints short lengths of flexible cable shall be provided, bonded to the metal work on either side of the joints. If the above provisions are not made by the manufacturers -, the Sub-contractor shall include cost of additional work necessary in his tender. See “Flexible Cords” clause for details of internal wiring of lighting fittings. Minimum size of internal wiring shall be 20/0.20mm (23/0067). Each lighting fitting shall be provided with number type and size of lamps as detailed on the drawings. It is to be noted that some fittings are suspended as shown on the drawings. Where two or more points are shown adjacent to each other on the drawings, e.g socket outlet and telephone outlet, they shall be lined up vertically or horizontally on the centre lines of the units concerned. Normally, the units shall be lined up on vertical centre lines, but where it is necessary to mount units at low level they shall be lined up horizontally. 1.35. POSITIONS OF POINTS AND SWITCHES Although the approximate positions of all points are shown on the drawings, enquiry shall be made as to the exact positions of all M.C.B panels, lighting points, socket outlets etc, before work is actually commenced. The Sub-contractor must approach the Architect with regard to the final layout of all lights on the ceiling and walls. The Sub-contractor must consult with the Engineer in liaison with the Clerk of Works, or the General Foreman on site regarding the positions of all points before fixing any conduit etc. The Sub-Contractor shall be responsible for all alterations made necessary by the noncompliance with the clause. 1.36. STREET/SECURITY OUTDOOR LIGHTING COLUMNS: The column shall be at a minimum of 225mm in the ground on 75mm thick concrete foundations and the pole upto 150mm shall be surrounded with concrete. The top bracket and plain section of the columns shall be common to and interchangeable with all brackets with maximum mismatching tolerance of 3mm between any pole and bracket. After manufacture and before erection the columns shall be treated with an approved mordant solution which shall be washed off and the whole allowed to dry. Thereafter, the columns shall be painted with one undercoat and two coats of gloss paint to an approved colour. All columns shall be complete with fused cut-outs. 35 1.37. TIMING CONTROL SWITCH These shall be installed where shown on the drawings. Photocell timing control circuits which will operate ‘on’ with a specified level of darkness and ‘off’ with a given level of light. The initial adjustment will be done with approval of the Electrical Engineer. 1.38. WIRING SYSTEM FOR STREET LIGHTING Cables shall be as indicated on the drawings, and shall be laid in a cable trench 450mm deep along the road sides and 600mm deep across the roads and 900mm away from the road kerb or 1500mm away from the edges of the road. ‘Loop-in’ and ‘Loop-out’ arrangement shall be used at every pole. Wiring to the lanterns on each pole shall be with 1.5mm² PVC twin insulated and sheathed cable with earth wire shall be laid at least 600mm below the finished road level on a compact bed of murram at least 50mm thick and covered with a concrete surrounded 150mm thick. 1.39. METAL CONTROL PILLAR These shall be metal clad and fabricated as per contract drawings and specification. The SubContractor shall supply, install, test and commission control pillars including supplying, fixing connecting switchgears as detailed on the appropriate drawings. 1.40. CURRENT OPERATED EARTH LEAKAGE CIRCUIT BREAKER Current operated earth leakage circuit breaker shall conform to B.S.S. 4293:68 rated at 240 volts D.P. 50 cycles A.C. Mains. The breaker shall be provided with test switch and fitted in weather proof enclosure for surface mounting. The rated load current and earth fault operating current shall be as specified in the drawings. These shall be as manufactured by Crabtree, Siemens or other equal and approved. 1.41. M.V. SWITCHBOARD AND SWITCHGEAR The switchboard shall be manufactured in accordance with KS04-226 which co-ordinates the requirements for electrical power switchgear and associated apparatus. It is not intended that this K.S. should cover the requirements for specified apparatus for which separate Kenyan Standard exist. All equipment and material used in the switchboard shall be in accordance with the appropriate Kenya Standard. The switchboard shall comprise the equipment shown on the drawings together with all current transformers, auxiliary fuses, labels, small wiring and interconnections necessary for the satisfactory operation of the switchboard. The Switchboard shall be of the flush fronted, enclosed, metal clad type with full front or rear access as called for in the particular specifications, suitable for indoor use, sectionalized as necessary to facilitate transport and erection. The maximum height of the switchboard is to be approximately 2.0 metres. A suitable connection chamber containing all field terminals shall be provided at the top or bottom of the switchboard as appropriate. Before manufacture, the Sub-Contractor shall submit to the consulting Engineer for approval of detailed drawings showing the layout, construction and connection of the switchboard. All bus-bars and bus-bar connections shall consist of high conductivity copper and be provided in accordance with KS 04-226: 1985. The bus-bars shall be clearly marked with the appropriate phase and neutral colours which should be red, yellow, blue for the phases and 36 black for neutral. The bus-bars shall be so arranged in the switchboard that the extensions to the left and right may be made in the future with ease should the need arise. Small wiring, which will be neatly arranged and cleated, shall be executed in accordance with B.S. 158 and the insulation of the wiring shall be coloured according to the phase or neutral connection. Switches and fuse switches, shall be in strict accordance with KS04-183:1978 Class 2 switches. Means of locking the switch in the “OFF” position shall be provided. All fuse switches shall comply with KS04-183:1978, PARTS 2 and 3 a fault rating at least equal to the fault rating of the switchboard in which they are installed. Cartridge fuse links to KS 04-183:1978 category A.C. 46, class Q1 and fusing factor not exceeding 1.5 shall be supplied with each fused switch. Mounting arrangements shall be such that individual complete fuse switches may be disconnected and withdrawn, when necessary, without extensive dismantling work. When switches are arranged in their formation all necessary horizontal and vertical barriers shall be provided to ensure segregation from adjacent units. Means of locking the switch in the “OFF” position shall be provided. 1.42. STEEL CONDUITS AND STEEL TRUNKING Conduits shall be of heavy gauge class “B” welded to Standard specification KS 04-180:1985. In no case will conduit smaller than 20mm diameter be used on the works. Conduits installed within buildings shall be black enamelled finish except where specified otherwise. Where installed externally or in damp conditions they shall be galvanised. Conduit fittings, accessories or equipment used in conjunction with galvanised conduits shall also be galvanised or otherwise as approved by the service engineer. Metal trunking shall be fabricated from mild steel of not less than 18 swg. All sections of trunking shall be rigidly fixed together and attached to the framework or fabric or the building at intervals of not less than 1.2m. Joint trunking shall not overhang fixing points by more than 0.5m. All trunking shall be made electrically continuous by means of 25 x 3mm copper links across each joint and where the trunking is galvanised, the links shall be made by galvanised flat iron strips. All trunking fittings (i.e. Bends, tees, etc) shall leave the main through completely clear of obstructions and continuously open except through walls and floors at which points suitable fire resisting barriers shall be provided as may be necessary. The inner edge of bends and tees shall be chamfered where cables larger than 35mm² are employed. Where trunking passes through ceilings and walls the cover shall be solidly fixed to 150mm either side of ceilings and floors and 50mm either side of walls. Screws and bolts securing covers to trunking or sections of covers together shall be arranged so that damage to cables cannot occur either when fixing covers or when installing cables in the trough. Where trunking is used to connect switchgear of fuseboards, such connections shall be made by trunking fittings manufactured for this purpose and not by multiple conduit couplings. 37 Where vertical sections of trunking are used which exceed 4.5m in length, staggered tie off points shall be provided at 4.5m intervals to support the weight of cables. Unless otherwise stated, all trunking systems shall be painted as for conduit. Where a wiring system incorporates galvanised conduit and trunking, the trunking shall be deemed to be galvanised unless specified otherwise. The number of cables to be installed in trunking shall be such as to permit easy drawing in without damage to the cables, and shall in no circumstances be such that a space factor of 45% is exceeded. Conduit and trunking shall be mechanically and electrically continuous. Conduit shall be tightly screwed between the various lengths so that they butt at the socketed joints. The internal edges of conduit and all fittings shall be smooth, free from burrs and other defects. Oil and any other insulating substance shall be removed from the screw threads; where conduits terminate in fuse-gear, distribution boards, adaptable boxes, non-spouted switchboxes, etc., they shall, unless otherwise stated, be connected thereto by means of smooth bore male brass bushes, compression washers and sockets. All exposed threads and abrasions shall be painted using an oil paint for black enameled tubing and galvanizing paint for galvanised tubing immediately after the conduits are erected. All bends and sets shall be made cold without altering the section of the conduit. The inner radius of the bed shall not be less than four (4) times the outside diameter of the conduit. Not more than two right angle bends will be permitted without the inter-position of a draw-in-box. Where straight runs of conduit are installed, draw-in-boxes shall be provided at distances not exceeding 15mm. No tees, elbows, sleeves, either of inspection or solid type, will be permitted. Conduit shall be swabbed out prior to drawing in cables, and they shall be laid so as to drain of all condensed moisture without injury to end connections. Conduits and trunking shall be run at least 150mm clear of hot water and steam pipes, and at least 75mm clear of cold water and other services unless otherwise approved by the services engineer. All boxes shall conform to KS 04 – 668: 1986, to be of malleable iron, and black enamelled or galvanised according to the type of conduit specified. All accessory boxes shall have threaded brass inserts. Box lids where required shall be heavy gauge metal, secured by means of zinc plated or cadmium plated steel screws. All adaptable boxes and lids of the same size shall be interchangeable. Boxes used on surface work are to be tapped or drilled to line up with the conduit fixed in distance type saddles allowing clearance between the conduit and wall without the need for setting the conduit. Where used in conjunction with mineral insulated copper sheathed cable, galvanized boxes shall be used and painted after erection. Draw-in boxes in the floors are generally to be avoided but where they are essential they must be grouped in positions approved by the services engineer and covered and by the suitable floor traps, with non-ferrous trays and covers. 38 The floor trap covers are to be recessed and filled in with a material to match the floor surface. The Sub-contractor must take full responsibility for the filling in of all covers, but the filling in material will be supplied and the filling carried out by the main building contractor. Where buried in the ground outside the building the whole of the buried conduit is to be painted with two coats of approved bitumastic composition before covering up. Where run on the surface, unpainted fittings and joints shall be painted with two coats of oil bound enamel applied to rust and grease free metalwork. 1.43. TESTING ON SITE The Sub-contractor shall conduct during and at the completion of the installation and, if required, again at the expiration of the maintenance period, tests in accordance with the relevant section of the current edition of the Regulations for the electrical equipment of buildings issued by the I.E.E of Great Britain, the Government Electrical Specification and the Electric Supply Company’s By-Laws. (a) Tests shall be carried out to prove that all single pole switches are installed in the ‘live’ conductor. (b) Tests shall be carried out to prove that all socket outlets and switched socket outlets are connected to the ‘live’ conductor in the terminal marked as such, and that each earth pin is effectively bonded to the earth continuity system. Tests shall be carried out to verify the continuity of all conductors of each ‘ring’ circuit. (c) Phase tests shall be carried out on completion of the installation to ensure that correct phase sequence is maintained throughout the installation. Triplicate copies of the results of the above tests shall be provided within 14 days of the witnessed tests and the Subcontractor will be required to issue to the service engineer the requisite certificate upon completion as required by the regulations referred to above. (d) Any faults, defects or omissions or faulty workmanship, incorrectly positioned or installed parts of the installation made apparently by such inspections or tests shall be rectified by the Sub-contractor at his own expense. (e) The Sub-contractor shall provide accurate instruments and apparatus and all labour required to carry out the above tests. The instruments and apparatus shall be made available to the services engineer to enable him to carry out such tests as he may require. (f) The Sub-contractor shall generally attend on other contractors employed on the project and carry out such electrical tests as may be necessary. (g) The Sub-contractor shall test to the services engineer’s approval and as specified elsewhere in this specification or in standards and regulations already referred to, all equipment, plant and apparatus forming part of the works and before connecting to any power or other supply and setting to work. (h) Where such equipment, etc., forms part of or is connected to a system whether primarily or of an electrical nature or otherwise (e.g. air conditioning system) the Sub-contractor shall attend on and assist in balancing, regulating testing and commissioning, or if primarily an electrical or other system forming part of works, shall balance, regulate, test and commission the system to the service engineer’s approval. 39 APPENDIX TO GENERAL SPECIFICATIONS OF MATERIALS AND WORKS The electrical sub-contractor shall comply with the following: 1. Government Electrical Specifications No. 1 and No. 2. 2. All requirements of Kenya Power Company Limited, and Communications Authority of Kenya (CA). 40 B. PARTICULAR SPECIFICATIONS FOR ELECTRICAL WORKS 1.00 SITE LOCATION The site of the proposed works is at Hyrax Hill Pre-historic site, Nakuru. 2.00 SCOPE OF WORKS The works to be carried out under this sub-contract comprise supply, installation, testing and commissioning of the following: a) 3.00 Electrical Works This shall include conduiting, cabling, fittings and accessories. MATERIALS FOR THE WORKS Materials shall be as specified in General Specifications and in the Bills of Quantities of this document which shall be read in conjunction with contract drawings. Alternative materials shall be accepted only after approval by the Project Manager. MINIMUM TECHNICAL SPECIFICATIONS FOR LED LAMPS/ LIGHTING FITTINGS LED TUBES, PANELS & BULBS LIGHT FITTING TECHNICAL SPECIFICATIONS IEC Compliant Item Minimum Specifications Proposed solution Brand State the brand, model and attach Technical Brochure (Mandatory) Operating ➢ Voltage range: 130-300 V ac ➢ Frequency range: 50-60Hz ➢ Power factor ≥ 0.9 lagging ➢ Total Harmonic Distortion (THD)<15% ➢ Ambient temperature range -10 to +35 °Operating ➢ Colour Consistency ≤ 5SDCM Performance Standards Compliance ➢ ➢ ➢ ➢ System efficacy ≥= 100lm/W Lamp colour temperature: 4000K - 6500K Colour Rendering Index >=80 Median useful life >= 30000 h CB/EMC/CE ➢ Driver/power unit/transformer - PSU-E General ➢ Optical cover/lens type bowl/cover prismatic - Polystyrene ➢ Protection class IEC - Safety class II (II) 41 C. PARTICULAR SPECIFICATIONS FOR SOLAR INSTALLATION WORKS 1.00 LOCATION OF SITE The site for the proposed Contract Works is at Hyrax Hill Pre-historic site, Nakuru.Kenya. 2.00 MINIMUM REQUIREMENTS This specification defines minimum requirements, but tenderers who offer superior facilities will be considered. Any tender which does not comply with the minimum requirements will be rejected. 3.00 BATTERY BANK Each battery in the battery bank shall be Lead Acid battery of the flooded type. The Electrolyte shall be Concentrated Sulphuric Acid while the anode (Positive) plate shall be a grid type with each grid holding lead oxide paste as the active electrochemical ingredient and the grid mesh made of pure lead as current conductor to the terminal. The Cathode (negative) plate shall be of similar construction with the plate being of pure lead paste. Several parts of positive and negative plates the minimum being suitably interlinked shall form a cell. The battery shall be composed of minimum six cells all interlinked with positive plate connected to negative plates and all terminations of positive and negative plate brought to single termination of positive and negative respectively. Each battery shall have a voltage rating 12 V as specified and have a rated charge capacity of 200Ampere Hour as specified when fully charged. Each battery shall be of such construction that during its operation its rate of discharge shall reach a minimum of 80% within 1seconds and 100% within 10 seconds respectively, when operated on full load. The batteries shall be long lasting, maintenance free and capable of a 3 year optimal operation with little or no change of Electrolyte. The number of batteries in the bank shall be predetermined taking into consideration the load requirement, climatic factor, Electricity supply panel’s specification, and the type of battery to be supplied. The tenderer is required to supply batteries as specified. 4.00 SOLAR PANEL Each panel shall be capable of providing maximum power output at maximum solar input (at midday). The minimum power output at the lowest level of sunlight (sunset or cloudy weather) shall not be below the specified output. All panels shall be fixed securely on a platform as shown in Drawings showing the position, and layout of the panel. They shall be installed tilted at the specified angle designed for maximum sunlight at the lowest point and such that the entire sun rays are approximately directly perpendicular to the panel throughout the day. 5.00 CONDUIT AND TRUNKING 42 All cables shall be drawn in Heavy gauge PVC conduit concealed in the fabrics of the Building or in Trunking. The conduit runs shall be close from the distribution point to the lighting or power point. The minimum size of conduit shall be 20mm and maximum 32mm. Not more than two right angle bends shall be allowed in any conduit run without a draw box. Conduit runs shall terminate on boxes for switches and socket outlets or circular boxes for lighting points. Terminal boxes with knockouts shall be terminated to the conduit by means of PVC Half Threaded couples with smooth male bushes. Circular Boxes with insitu sprout shall be terminated to the conduit by means of adhesive as Ega weld or equivalent. Conduit work including all accessories must be installed first before wiring commences. The conduit shall be free from moisture, burrs, and debris. Where single cables of the opposite poles are to run in the same direction they should not be drawn in the same conduit while cables from another pole shall be segregated and drawn in separate conduit and these conduit runs shall be installed parallel up to the conduit and Trunking .The distribution board, conduit system shall be separate from KPLC supply system but the installation shall be similar to AC system. All cabling and associated ancillary equipment shall be selected and installed in accordance with the general requirements of KS 662(Kenya wiring Regulations). 6.00 ISOLATORS Modules shall be arranged and interconnected to form an array. Each has inbuilt diode to prevent reverse current flowing to any of the module. Each Array shall have an isolator separating the array from each additional array or string of series connected modules. The drawing indicates the position of the isolators among the arrays of modules. At the isolator point the open circuit voltage (VOC) and short circuit current (ISC) for each array can be measured. Both positive and negative poles of each shall be simultaneously isolated. The isolator shall be of quick make and break time to avoid appreciable arcing at the terminals of the isolator. The contactors of the isolator shall be of copper alloy heat resistant type. All live and neutral terminals shall be shrouded and terminals firmly supported by appropriate insulation material (porcelain Bakelite etc). The isolator shall be rated to isolate currents not exceeding its maximum operating isolator current. (e.g 30A rated DC current to isolate 30A maximum current). The isolator shall conform to KS IEC 60947 – 3:1999 (Specification for Low-Voltage switchgear and control gear) specifications and requirements. 7.00 CABLES The DC cable length from the panel to the battery or inverter or distribution point shall be as short as possible. It should be noted that the short circuit current from a PV module is limited by the internal resistance of the module and is only slightly higher than the normal operating current so fuses are of little use in protecting 43 apparatus, cables, distribution, lighting points or power points supplied from the modules directly. Thus, when short circuit occurs in such a system it can continue undetected for a long time as long as the panel is exposed to light and can cause fire. Precaution must be taken to ensure safety for the installed solar system. Minimum lengths of DC cable shall ensure low cost and low voltage drop. The installation shall be ground fault proof and short circuit proof. Cables from the modules shall be drawn into conduits and terminated at Distribution Board terminal Blocks. Cables from the batteries shall also be linked to this cable at the terminal blocks. From the distribution board short lengths of cable shall supply a Consumer Unit. All lighting points and power points final sub-circuits shall be from this consumer unit. All final sub-circuits shall have isolator switches at the start of the final sub-circuit. All cables conduits, junction boxes need to be suitable for environment and load carried. Where the cables are to run outdoor, they shall be resistant to chemical and ultraviolet (UV) light and when run in wet places or dump atmosphere, they shall be marine type of cables. The cables shall be protected against sunlight and mechanical damage. The size and type of the cable shall be such as to operate and withstand the operating temperature range, to withstand the rated current and have acceptable voltage drop. Single core cable with non-metallic sheath shall be drawn as a bunch with negative and positive drawn in the same conduit. Single core cables with basic insulation shall be drawn singularly in conduit. Cables with basic insulation only and earth screened shall be drawn singularly together with cables of the same poles in the same conduit. Cables of opposite pole shall not be drawn in those conduits but segregated and drawn in separate conduits The cable size shall be such as to comply with requirements of IEC 60304 and KS 04 187 -1987 (Specification for conductors of insulated cables, 2nd Edition) specification for conductors for nominal cross –section 0.5 mm sq. to 2000mmsq., which also specifies resistance value of conductors as well as flexible cord. The number of junctions and interconnections in the final circuit shall be as low as possible. AC cables shall be run or drawn in separate conduits or ways. AC cables shall have different coloring of the insulation from DC. The color scheme of insulating materials of various cables is shown in the drawing. All cable conductors shall be of copper unless otherwise specified. The current carrying capacity of a cable is largely determined by operating temperature range shall be 25ºC to 65ºC.Wiring system components including cables and wiring accessories shall be handled only at temperatures within the limits stated in the relevant product specification or as given by the manufacturers. Cables used for string wiring must be selected taking into account higher ambient temperatures than other cables at temperatures behind the modules may exceed 44 80ºC.The voltage drop from the array to inverter or Distribution board shall not exceed 2.5% of the nominal voltage at the Distribution board or inverter. 8.00 PHOTO-VOLTAIC ARRAY The Photovoltaic (PV) cell shall either be of the three types: a) Mono crystalline silicon – made using a slice from a single crystal of silicon b) Polycrystalline silicon cell made from silicon cast in a mould and cells are larger than above c) Thin film amorphous silicon deposited as coating only a few microns thick. The installer shall state the type of cell the PV module is made from. Each solar panel shall be composed of silicon cell of size 100mm x 100mm capable of producing 3A at 0.5volts in bright sunshine (1.5watts). These cells are then interconnected in series to make a module panel. It is preferred that each panel shall have a minimum of 36 cells while a panel of 72 cells shall be of added advantage (more power). The cells are protected by encapsulating them between a transparent front cover and a backing sheet to form a PV module. The front cover shall be of low-iron toughened glass and the backing sheet shall be glass or an opaque material. The cells shall be hermetically sealed using silicon (for transparent module or ethylene vinyl acetate (EVA) – (This sandwich is called a laminate) A flexible PV can be produced by encapsulating the cells in plastic material, the cell being made of amorphous silicon. The module or laminate sheet can either be framed to form framed modules or remain unframed (laminates) or constructed as to be Roof tile or cladding of a building. The PV shall either be opaque type semi – transparent – with cells sandwiched between two sheets of glass and spaced to allow light through between the cells. Or Be translucent (of amorphous cell which are pervious to or allows light to diffuse through. Cells shall either be blue or black in color for better efficient light to power conversion. Note colored cells reflect more light. Panels shall be tested under Standard Test Conditions (STC) at 1000W/ M² at air mass of 1.5KG/M3 and cell temperature of 25ºC. The result shall be presented in a current/voltage curve or graph. The nominal peak power for each module as measured in the test in watts peak (WP) shall not be below 16 – 18 Volt range. Each module shall have at its output terminals Blocking diodes connected in series with a string to protect the module from reverse current flow from either the adjacent module or battery bank. 45 The panels shall be protected from lightning and surges. The surge protecting devices shall be Circuit Breakers, fuses or surge diverters installed at the final output of PV array. It shall protect the array from reverse surges from battery bank or inverters. Bypass diodes may be placed around a module that is likely to have localized shading. It provides a current path around such a shaded module. 9.00 SOLAR RADIATION Though Geographical location determines the performance of the solar Energy, the installer shall ensure his panels are properly installed tilted appropriately and oriented such as to maximize receipt of solar radiation.The tilt and orientation shall ensure at least 90% of the maximum energy is received by the panels. 10.00 SHADING Shading is unethical and shall be avoided as much as possible. Shading results in significant loss of energy from the panels. 11.00 MISMATCH All cells in the module must have similar characteristic. Similarly, all modules must have similar characteristic as poor-quality modules leads to significant loss of energy since the inferior module determines the current. 12.00 TEMPERATURES Any radiation not converted into electricity is converted to heat. The waste heat can cause temperatures around the modules to rise. At 90ºC EVA encapsulate will be damaged. The panel shall be installed raised at least 150mm above roof, façade etc to allow for natural ventilation of the panel both on the front side and the back side. The efficiency of the PV cells drops significantly as the temperature of the cell rises: ▪ 0.45% for every degree rise in temperature for mono crystalline silicon ▪ It is less for amorphous silicon cell – 0.25%. Care shall be taken to ensure the panels are well ventilated and where this cannot be achieved naturally then mechanical ventilation shall be provided. 13.00 CLEANLINESS The panels shall be installed tilted to reduce dust accumulation and allow for self cleaning. Tilt angle should be selected to optimize the energy collection during the worst month i.e the month with the lowest ratio of monthly mean daily irradiation to the monthly man daily load. Generally, the following formula shall be used. Tilt (degrees)|Ø| + 150;0} where Ø is the latitude of the installation Dust may cause power reduction of about 10%.Tilts also allow for rain cleaning of the panels. However the panels shall be cleaned every month during the 6 months liability period. 46 14.00 DISTRIBUTION BOARD – NON-INVERTER SYSTEM The Distribution Board shall be suitable for DC current application with high rapture cartridge (HRC) fuses installed to offer class 1 protection. The rating of each fuse shall be equal to the current rating of the final circuitcable it protects. The supply cable from the PV array to the Battery bank and from the battery bank a sub-main cable of the size shown in the drawing shall supply the distribution board. Isolators shall be placed immediately at termination point of the array and another isolator shall be placed between the Battery Bank and the Distribution board. 15.00 WIRING The live conductor of the final circuit for lighting point or power point shall emanate from one way of the Distribution board, protected by HRC fuses and looped to switches as switch line. From the switches, the live conductor shall be looped to various lighting points controlled by the switch. For Ring Main power points the Final circuit shall originate from one way of the Distribution board protected by HRC fuses, looped in each socket outlet and return to the same way thus making a ring circuit. For lighting point the neutral conductor shall be drawn in separate conduit and looped directly to the terminal of each lighting point controlled by several switches. For Ring main power points, the neutral conductor shall be looped in similar way to the live conductor. 16.00 INVERTER Where the PV array are to generate and supply DC power which is to be converted to AC before utilization, then the supply cable from the PV array shall be terminated to an inverter or inverters through DC isolator/Isolators. The inverter shall have in built maximum power point tracker (MPPT) which varies the input voltage to try and ensure that it operates close to maximum power point (MPP). The Inverter shall be protected by Surge Arresters and input over voltage relay or circuit breakers. The Inverter shall be a power conditioning unit (PCU) which covert the DC power to AC power and associated control and protection equipment. One of the two types of Inverters shall be installed: a) Line commutated – This a single inverter where the PV array are connected. Care must be taken to improve the power factor and harmonics. b) Self-commutated- This type uses their own internal switching (pulse width modulated (PWM). 47 All shall comply to electromagnetic compatibility BS EN 50081 standard and Generic emission standard as well as BS EN- INVERTER PROTECTION Inverter shall be protected from PV by either; a) Surge protectors. b) Circuit Breakers placed between the PV and Inverter. c) Over-voltage protection between the PV and Inverter to protect the inverter against voltage higher than the rated input. 18.00 PV SYSTEM WITH BATTERY BANK Where the Battery Banks shall be the source of Solar Energy after being charged by PV array, the installation for Distribution of the power supply shall be as follows:From the battery bank the sub-main supply cable shall be drawn in Heavy gauge PVC conduits or in trunking as described in clause 2.06 and the cables shall terminate at suitable DC fuse board specified below. The cable shall be protected by a suitable Double pole switch fuse of rating as specified in the drawings. The minimum supply voltage shall be 50V and maximum 150V. 19.00 DISTRIBUTION BOARD – INVERTER SYSTEM The Distribution shall have adequate ways for Distribution to the various final subcircuits. The minimum number ways shall be 4 ways. Power points shall be supplied from final sub-circuits that are separate from Lighting point final sub-circuit. Each lighting final circuit shall be protected by an appropriately rated protective device to the total current demand of lighting fittings supplied by the circuit. Each socket outlets final circuit shall also be protected by a protective device rated at 30A/32A for ring final sub-circuit. However the rating of Radial power point final circuit shall depend on the power requirement of the appliance, apparatus or equipment it is supplying. The power requirement of the whole installation has been predetermined and no additional lighting points, appliances, or apparatus or equipment shall be added as load to the installation. 20.00 LIGHTING POINTS FINAL CIRCUIT Live conductors shall be looped to switches controlling lighting points while neutral conductors shall be looped to each light fitting supplying the final sub-circuit. See drawing showing the recommended wiring system of DC supply. No termination of cables shall be allowed in junction boxes, inspection boxes etc and all pointing, termination, looping shall be at the either the switch terminals, or lighting fitting terminals. 48 Lighting point supply cable from the switch shall be drawn in separate or same conduit as the switch supply (switch line) and shall terminate at the lighting point. The installation shall be such that no terminals at the lighting point shall be “Live” when the switch is on “off” position. 21.00 RADIAL FINAL CIRCUIT All cables in the Radial final circuit shall be of basic insulation or insulated and sheathed copper conductor of appropriate current rating at supply voltage (50-150V). The rating of the cable shall not be less than the current demand of the equipment apparatus alliance, etc being supplied by the cable. All the cables, neutral and live shall be drawn as described in clause 2.06. The conduit shall terminate at the conduit box where the socket outlet, fused spur, or a connection plate with cord outlet shall be fixed. 22.00 RING FINAL CIRCUIT The installation shall be similar to the Radial final circuit except the live and neutral cable will leave one way from Distribution Board looped at each power point and return to the same way. 23.00 EARTHING – BATTERY BANK SYSTEM All switches, socket outlets including their boxes, that are metallic shall be bonded to an earth protective conductor. All metal enclosure of protective switchgear shall be bonded to the earth continuity conductor. The supporting structure for the PV array shall also be bonded to earth continuity conductor when the PV system is framed with metallic frame, unless the PV is double insulated in accordance with the current edition of “Requirements of Electrical Installations” (IEE Regulations). The output of the array under any circumstance shall not be connected to earth continuity conductor. The neutral conductor shall not be connected to earth continuity conductor in a Battery Bank supply system. The earth continuity conductor shall be drawn in separate conduit from line and neutral conductors if it is of basic insulation, and in the same conduit if it is insulated and sheathed. At the Distribution board all earth continuity conductors shall be terminated on an Earth bus-bar in the same sequence as that of the live and neutral conductors of the final circuit which the earth continuity conductor is part. Earth lead shall be drawn in a separate conduit concealed in the fabric of the building and terminate at Earth Inspection Chamber. The earth lead shall be as per the current edition of “Requirements of Electrical Installations” (IEE Regulations). The earth lead shall be clamped to the copper earth electrode rod to be driven to the ground. The Earth Inspection Chamber shall be special purpose concrete construction minimum size 300mm x 300mm as shown in the drawing. 49 24.00 EARTHING –INVERTER SYSTEM The normal AC earthing method shall be followed when the system is an inverter type. Earthing shall be in accordance to Requirements of Electrical Installations. 50 MINIMUM TECHNICAL SPECIFICATIONS FOR SOLAR POWER FITTINGS A. INVERTERS-850W Item- Minimum Specifications Rated Continuous Output 850W Pure sine wave for power – Power Inverter Surge Power Capability 200% of rated continuous Power Peak Efficiency (Minimum) 85% Frequency 50HZ Nominal Input voltage 24VDC Output Voltage Range 220 - 240V AC (RMS) Output Voltage Regulation +/- 5% Battery low shut down (10.5+/-0.5) VDC Protection (electrical) Overload and short circuit Low battery disconnect Power factor capability -1 to +1 Charging algorithm of Constant voltage charger Charger input voltage range 200V to 250V AC Minimum rated Charging 20A Current Guarantee 5 years 51 Proposed Solution B. CHARGE CONTROLLER Item 1 Main features 2 3 4 Minimum Specifications Series or Shunt type, constantvoltage, pulse width modulation (PWM) charging, with battery type (sealed/gel and flooded lead acid) selection provision and temperature compensation. Nominal Voltage 24V DC Rated solar charging current As per description in the Bills of Quantities Earthing Negative earth Item 5 Metering 6 7 8 9 10 Minimum Specifications Digital metering for currents and voltages Operating temperature 40 to + 60o C Protection Reversed polarity protection, Overload and short circuit protection, lightning and transients surge protection, Night reverse current protection (blocking diode or equivalent.) Self- Consumption 0.5% (Maximum) of rated current Status Indicators (minimum) Charging and low battery visual indicators Guarantee 5 years 52 Proposed Solution Proposed Solution C. STORAGE BATTERIES - 12V/200AH Item 1 Rated capacity 2 3 Minimum Specifications As per Description in the Bills of Quantities 4 Deep Cycle Discharge rate to 1.75V/Cell for the Specified Capacities Battery Type 5 6 7 Plate type Electrolyte Nominal Voltage 8 Minimum Cycle Life 9 Casing material 10 11 Minimum charge retention Monthly self-discharge ratio Proposed Solution Maximum 20 Hours Dry sealed batteries (Maintenance Free) Flat plate or Tubular acceptable Gel Type 12V. Supply may be in 12V or 6V mono-blocks 1,500 cycles at 50% daily depth of discharge Polypropylene or similar translucent/transparent case 60% in 8 months <3% D. SOLAR PV MODULES- 575W Item Minimum Specifications 1 Cell type Mono crystalline 2 Originality Verification Barcode or Serial number System with batch number 3 Solar cells encapsulated in EVA (ethylene-vinyl acetate); antireflection coating; Module on the front side protected by tempered, highly translucent glass. 4 Dimensions 2385x1122x35mm 5 Weight 30.3kg 6 Glass-foil laminated in anodized aluminum-frame 7 Wind load certification 0.024 bars 8 Front glass High transmission, low iron, Tempered glass 9 Weather resistant Junction box with 3 Bypass-diodes on the backside of the modules with protection class min. IP 65 53 Proposed Solution 10 - 30 31 32 Wiring of the modules with pin-and-socket connector according to EN 50521 Quantity of cells 156 (2x78) Temperature coefficient PMAX: <=-0.35%/C Temperature coefficient Voc: <=-0.28%/C Temperature coefficient Isc: <=0.048%/C Operating temperature range: -0°C < =T< =45 °C Nominal operating cell 45+/- 2 °C temperature (NOCT) Module efficiency at STC-conditions > 21.49% Current at maximum power 12.88A point (A) (maximum) Voltage at maximum Power 44.67V Point (V) (minimum) Open Circuit voltage (Voc) 53.20V Short circuit current (Isc) 13.74A Minimum rating 575W 10 years product warranty 25 years linear performance guarantee (90% up to 12 years and 80% up to 25 years) CE- conformity, DVE GS, TUV quality certified for product Horizontal and vertical assembly possible High Mechanical load (acc. IEC 61215 (5400Pa superimposed load and 2400Pa suction load)) Pre-cabled with MC4 Plug –connectors (IP 67) Nominal power at IEC-Conditions (radiation 1000W/m2, AirMass 1.5 25°C) Product certification Protection class Salt mist corrosion test IEC 61215 (Ed.2) II/ IEC 61730 IEC 61701 (Ed. 2) 1.0 BROCHURES AND TECHNICAL LITERATURE Tenderers must enclose together with their submitted bids brochures detailing technical Literature and specifications of the active components of the access control system. The brochures shall be used to evaluate the suitability of these components. Any bid submitted without the brochures shall be considered technically non-responsive, and may subsequently be disqualified. 54 SECTION III – TECHNICAL SCHEDULE 1. The technical schedule shall be submitted by tenderers to facilitate and enable the Project Manager to evaluate the tenders, especially where the tenderer intends to supply or has based his tender sum on equipment which differs in manufacture, type or performance from the specifications indicated by the Project Manager. 2. The filling of this schedule forms part of Technical Evaluation of the tenders, and bidders shall therefore be required to indicate the type/make and country of origin of all the materials and equipment they intend to offer to the employer in this schedule. 3. This schedule shall form part of the technical evaluation criterion, and tenderers are therefore advised to complete the schedule as they shall be considered responsive. 55 TECHNICAL SCHEDULE OF ITEMS TO BE SUPPLIED (To be completed by the Tenderer) ITEM 1 DESCRIPTION TYPE/MAKE MODEL COUNTRY OF ORIGIN LIGHTING FITTINGS i. 2 feet (L600), LED Batten ii. TrueLine Surface mounted LED Light iii. Solar flood light iv. Black Ornamental Outdoor Gate Lamp v. Glass Rectangular Bulkhead Outdoor light 2 Lighting Switches 3 Socket outlet plates 4 Consumer Units/ Distribution Boards 5 MCBs 6 7 Cables ❖ single core PVC Copper ❖ Armoured Copper (PVC/SWA/PVC) 8 HG PVC conduits 9 PVC Conduits 10 Cable Trunking 11 Cable Accessories 12 Solar Inverter 13 Charge Controller 14 Storage Battery 15 Solar PV Module Detailed manufacturer’s Brochures detailing Technical Literature and specifications on the above items MUST be attached and Items to be supplied highlighted (Model and Make) 56 SECTION IV – SCHEDULE OF UNITS RATES 1. The tenderer shall insert unit rates against the items in the following schedules and may add such other items as he considers appropriate. 2. The unit rates shall include for supply, transport, insurance, delivery to site, storage as necessary, assembling, cleaning, installing, connecting, profit and maintenance in defects liability and any other obligation under this contract. 3. The unit rates will be used to assess the value of additions or omissions arising from authorized variations to the contract works. 4. Where trade names or manufacturer’s catalogue numbers are mentioned in the specification, the reference is intended as a guide to the type of article or quality of material required. Alternative brands of equal and approved quality will be accepted. The prices quoted shall be deemed to include for all obligations under the sub-contract including but not limited to supply of materials, labour, delivery to site, storage on site, installation, testing, commissioning and all taxes (including V.A.T, Withholding tax and all other taxes applicable at the time of tender). 5. 6. Any bid returned with unfilled Schedule of Unit Rates shall be considered technically non- responsive, and the bidder shall automatically be disqualified. 57 SCHEDULE OF UNIT RATES (To be completed by the Tenderer) UNIT RATE NO DESCRIPTION QTY UNIT (KSHS) 1 2 3 4 5 6 7 PVC/SWA/PVC Armoured Copper cables per metre a) 10.0mm sq. 2 core b ) 10.0 mm sq 4 core c) 16.0 mm sq 2core d) 16.0 mm sq 4core 1 1 1 1 M M M M IP 65 rated Isolators as KATKO, 3 Phase a) 20A b) 6 3 A c) 100A 1 1 1 NO NO NO IP 65 rated Isolators as KATKO, single phase a) 32A b) 6 3 A c) 100A 1 1 1 NO NO NO Emergency shutdown switch 1 NO Cables: a) Single Core PVC Cables i) 10mm2 ii) 16mm2 iii) 25mm2 Consumer Units and Distribution Boards: Lockable 12 Way TPN Consumer Unit/Distribution Board as Merlin Gerlin or an approved equivalent a) 10 Way SPN with integral 100A Isolating Switch b) 10 Way TPN with integral 125A Isolating Switch c) 12 Way SPN with integral 100A Isolating Switch d) 12 Way TPN with integral 150A Isolating Switch IP65 rated Isolators as KATKO: a)63TPIsolator b) 6 3 A SP Isolator c) 100A TP Isolator d) 1 0 0 A SP Isolator 58 1 1 1 M M M 1 NO 1 NO 1 NO 1 NO 1 1 1 1 NO NO NO NO (CTS) UNIT RATE NO DESCRIPTION QTY UNIT (KSHS) 9 10 Cable Trunking Two compartment powder coated steel trunking manufactured in14 SWG galvanized mild steel sheet and finished in cream powder coating with the following dimensions; a) 50x25mm b) 75x50mm c) 200x50mm 1 1 1 M M M Cable Trunking Two compartment powder coated HG PVC trunking manufactured in heavy gauge material and finished in cream powder coating with the following dimensions; a) 50x25mm b) 75x50mm 1 1 M M 59 (CTS)