NAIROBI OPERATIONAL HUB INDEX A. Electrical Works B. General Provisions for Electrical Work C. Electric Identification D. Conduits E. Underground Electrical Service F. Cables and Wires G. Supporting Devices H. Main Distribution Equipment I. Lighting J. Earthing K. Data System L. Approved Manufacturer List UNOPS Building, UN Lane, Off UN Avenue P.O Box 783,Village Market, 00621 Nairobi, Kenya Tel: +254 20 7621120 E-mail: info@unops.org Website: www.unops.
NAIROBI OPERATIONAL HUB ELECTRICAL WORKS PART 1 - GENERAL ELECTRICAL SUB-CONTRACTOR A. The electrical work shall be carried out by an electrical sub-contractor who is on the approved list of electrical contractor's. B. The electrical sub-contractor must have, during the entire duration of the Contract, qualified electrical engineer and electrical supervisor for ensuring proper execution and supervision of work.
NAIROBI OPERATIONAL HUB 1.02 A.
NAIROBI OPERATIONAL HUB The following related service installations are specified in other divisions of the Specifications. The Contractor shall co-ordinate all his installation with the related works such as: - Plumbing - HVAC - Fire Fighting - Interior Finishes & Architectural Works - Any other sub-contractor engaged for the project. 1.03 REGULATIONS A.
NAIROBI OPERATIONAL HUB 1.05 D. The above temperatures do not take into consideration heat generated from the equipment itself or from any other equipment installed in the vicinity. E. The capacity and rating of all electrical equipment and materials given are Local rating, i.e. rating when equipment are operating under Local Climatic Conditions. Any derating factors applied should be clearly indicated. F. Where specific sizes are indicated e.g.
NAIROBI OPERATIONAL HUB - National Fire Protection Association (NFPA) 1.07 B. Standards for materials and the design of equipment are quoted throughout this specification and the Contractor shall produce copies of these Standards as required and instructed by the Engineer. If the Contractor offers equipment, which is not manufactured, in compliance with these Standards the equipment offered should be at least equal in performance and quality to that required by the relevant Standard. C.
NAIROBI OPERATIONAL HUB render the equipment suitable for the climatic conditions of the site. Full considerations shall be given to the severe climatic conditions. 1.08 FUSING AND PROTECTION A. The rating (in amperes) of circuit breakers, switch fuses and circuit ways of distribution boards given on diagrams or drawings are the maximum normal (operating) rating permissible for such circuit.
NAIROBI OPERATIONAL HUB 1. D. Prepare and submit for approval, before commencing any portion of the Contract work, complete shop drawings, which shall show: - Exact routes of cables and ducts including sizes and details of installation. - Cable trays and ladders giving routes, sizes and details of supports and hangers. - Exact runs of conduits and trunking including sizes, draw boxes and junction boxes and the number and sizes of wires in each run.
NAIROBI OPERATIONAL HUB E. F. Record Drawings / As Built Drawings 1. At the conclusion of work, prepare and submit "Record Drawings" (As Built Drawings).. 2. These drawings shall be titled "Record Drawings" and shall be prepared from the marked up progress prints. Submit "Record Drawings" to the Engineer for review and approval. 3.
NAIROBI OPERATIONAL HUB PART 2 – PRODUCT 2.01 MATERIALS A. All equipment and materials used in the electrical installation work shall be new and of the highest quality. They shall be suitable for operation the standard voltage and frequency in the area of the project. B. Unless otherwise specified, all equipment and materials shall comply as a minimum with the latest relevant recommendations of the International Electrotechnical Commission (IEC).
NAIROBI OPERATIONAL HUB 2. Relevant sheets of manufacturer's catalogues, specifications, technical data ...etc. 3. Confirmation that equipment and materials offered complies fully with relevant Clauses of the Specification and, in case of deviation from the Specification, a schedule of deviations listing all points not conforming to the Specification. 4. Short circuit study including all components shown on the Schematic Diagrams. G.
NAIROBI OPERATIONAL HUB A. The Contractor shall keep permanently on the site, a competent Senior Electrical Engineer, having an experience of not less than 10 years, as his representative fully experienced and who has executed as Superintendent of electrical installation works of the type and scale similar or larger than this Project. B. 3.03 3.
NAIROBI OPERATIONAL HUB A. On completion of the entire electrical installation work or any separate or distinct part thereof, notify the Engineer, in writing, that the completed part of the electrical work is ready for inspection. Before doing so, perform initial trial tests. Test, correct, adjust, balance, regulate, ...etc. the section concerned as necessary until required conditions are obtained. B.
NAIROBI OPERATIONAL HUB 3.05 H. Acceptance certificate will not be issued until all testing and commissioning has been carried out to the satisfaction of the Engineer and local authorities. After local authorities 's final approval microfilm of asbuilt drawing shall be given to the Engineer for permanent record. I. An amount equal to 5% of the contract value for the Electrical, Communication and Electronic works will be retained till the completion of all commissioning.
NAIROBI OPERATIONAL HUB 3.07 D. Include all routine and preventive scheduled maintenance as recommended by the equipment manufacturers to keep equipment in perfect operating condition. E. Keep all records, logbooks, log sheets, maintenance job cards ...etc. in neat order to the satisfaction of the Engineer. All records, log books, and log sheets, charts, maintenance job cards, ...etc. shall become the property of the Employer. F.
NAIROBI OPERATIONAL HUB all other damage done to areas, materials and other systems resulting from this failure. C. 3.08 Guarantee that all elements of the systems are of sufficient capacity to meet the specified performance requirements as set forth herein or as indicated. SPARE PARTS A. Spare Parts during Two years Maintenance Period: Contractor shall provide all spare parts required during the two (2) years maintenance period at NO cost B.
NAIROBI OPERATIONAL HUB General Provisions for Electrical Work Part 1-General 1.01 Work Included All electrical work shown on the drawings or mentioned in B.O.Q. 1.02 Quality Assurance A. General Provisions contained in this section, shall apply and form a part of each and every section of specification, Division 16, Electrical. B.
NAIROBI OPERATIONAL HUB E. All items of labor and material required to comply with such standards and codes in accordance with the requirements of the Contract Documents shall be included. Where quantities, sizes or other requirements indicated on the drawings or herein specified are in excess of the requirements of the standards and codes, the specifications and /or drawings shall govern. F. The electrical drawings shall serve to indicate the general layout of the various items of equipment.
NAIROBI OPERATIONAL HUB stated in the specifications and as shown on the drawings and shall show all pertinent information and data for the fabrication and complete installation. Material Submittals: Shall be made for 3 different manufacturers. Energy saving equipment /materials shall be given preference. B. Manufacturer’s Literature: Manufacturer’s data sheets shall be submitted indicating the necessary installation dimensions, weights, materials, and performance information.
NAIROBI OPERATIONAL HUB A. The Contractor shall keep all raceways and conduit system openings closed by means of plugs or caps to prevent the entrance of foreign matter and cover all fixtures, equipment and apparatus as required to protect them against dirt, water, chemical or mechanical damage both before and after installation. B. Plugs and caps shall be of such types as to prevent transmission of flood water through any duct, conduit or raceway.
NAIROBI OPERATIONAL HUB construction operations, the Contractor shall relocate said facilities in an approved manner. No wire, bus or electrical equipment which is part of any of the permanent electrical systems may be used for temporary electrical service for construction operations. Temporary connections shall be safe in accordance with accepted practices.
NAIROBI OPERATIONAL HUB B. The Contractor shall make his interface with the incoming primary telecommunications cable(s) at the site boundary in the manner shown on the Drawings. Part 2 Products 2.01General A. Except for those items as may be specified in Part 3 of this Section, refer to Part 2 of the various sections of the specification, Division 16, Electrical. Part 3 Execution 3.
NAIROBI OPERATIONAL HUB C. Individual hangers, trapeze hangers and riser clamps shall be provided for supporting conduit and all parts and hardware shall be zinc-coated (galvanized). D. Pipe straps and hanger rods shall be fastened to concrete by means of inserts or expansion bolts, to brickwork by means of expansion bolts and to hollow masonry by means of toggle bolts. Wooden plugs and shields shall not be used for fastening pipe strips and hangers. E.
NAIROBI OPERATIONAL HUB B. He shall furnish and install all sleeves and inserts required for this work. Cutting and patching of any part of the structure shall be done only after review by the Supervising Engineer. 3.05 Access Panels Access panels shall be installed where indicated and as required for access to equipment and apparatus.
NAIROBI OPERATIONAL HUB A. Prior to starting the electrical installation, the Contractor shall verify the correct voltage, phases and current consumption of all utilization equipment to be voltage, phases and current consumption of all utilization equipment to be connected. Branch circuit wiring, voltage and circuit breakers must be adequate in each case. B.
NAIROBI OPERATIONAL HUB termination points to and between motors, starters and control equipment associated with the equipment named, is included. D. Wiring for temperature control equipment is specified under this division. E. Unless otherwise specified, all wiring to motors, control equipment and related electrical equipment, shall be run in rigid metallic conduit with flexible connections where required.
NAIROBI OPERATIONAL HUB 2. Where bolted connections are made between copper or brass surfaces, the metal surfaces shall be thoroughly cleaned and coated with a corrosion thoroughly inhibiting compound. 3. The tightness of each bolt in each factory made bolted electrical connection shall be checked during erection and connection of the equipment. 4.
NAIROBI OPERATIONAL HUB 3.12 Short Circuit and Protective Device Coordination Studies A. It is the responsibility of the Contractor to check the information given in the Project Documents about voltages and frequency with the Electric Power Company and confirm the data in writing to the Supervising Engineer. B. Conductors and equipment shall be protected against overcurrent in accordance with their rated ampecities.
NAIROBI OPERATIONAL HUB characteristic. Tabulate recommended instantaneous, and time delay settings. device tap, time dial, pick-up, F. Include on the curve sheets power company relay and fuse characteristics, medium voltage equipment relay and fuse characteristics, low voltage equipment circuit breaker trip device and fuse characteristics, pertinent transformer characteristics, pertinent motor and generator characteristics, and characteristics of other system load protective devices.
NAIROBI OPERATIONAL HUB studies shall be carried out by the particular manufacturer or by the Contractor at no additional cost to the Owner. 3.13 Equipment Testing and Commissioning A. General: The testing of all electrical equipment shall include, but not be limited to, the items below. This shall be in addition to testing specified elsewhere in this specification. 1. 2. 3. 4. General Equipment check. Field wiring and ground system verification. Conductor insulation tests. Equipment adjustment.
NAIROBI OPERATIONAL HUB After connection of ground rods to each manhole’s grounding mat, the Contractor shall obtain a ground resistance measurement from a flush ground plate. These data shall be obtained, identified, and recorded and the results sent to the Supervising Engineer within five days. The ground resistance measurement data may indicate that additional ground rods are required. The Contractor shall furnish, install, and connect additional ground rods as the Supervising Engineer may direct. D.
NAIROBI OPERATIONAL HUB *** End of Section*** UNOPS Building, UN Lane, Off UN Avenue P.O Box 783,Village Market, 00621 Nairobi, Kenya Tel: +254 20 7621120 E-mail: info@unops.org Website: www.unops.
NAIROBI OPERATIONAL HUB ELECTRICAL IDENTIFICATION PART 1 GENERAL 1.01 SECTION INCLUDES A. Electrical identification to identify all electrical items for easy operation and maintenance including, but not limited to the following: 1.02 1. Nameplates and labels. 2. Wire markers. 3. Colour coding of raceways. 4. Circuit identification charts. 5. Cable identification tags. 6. Cable warning tapes. 7. Cable markers. 8. Equipment warning/danger signs. RELATED SECTIONS A. B.
NAIROBI OPERATIONAL HUB A. Submit for complete and detailed manufacturer's catalogues and data relating which shall include, but not limited to, the following: 1. Name of the manufacturer. 2. Country of origin. 3. Method of obtaining spare parts for maintenance and list of spare parts sufficient for a 2 years period. 4. Technical performance of the equipment selected. 5. Dimensional details needed for installation and maintenance. 6. Delivery time from the date of orders. 7.
NAIROBI OPERATIONAL HUB PART 2 PRODUCTS 2.01 NAMEPLATES AND LABELS A. Nameplates and labels shall be engraved on a three-layer 2 traffolyte plate having minimum thickness of 2 mm, securely screwed to the housing and have black letters on white background in Arabic and English. B. The name plates and labels shall be required for each electrical distribution board, control panels, equipment enclosures, substation equipment, disconnect switches and equipment cabinets. C.
NAIROBI OPERATIONAL HUB A. Provide color bands with printed description of each system, minimum 75 mm wide for all cable trays/ladders and trunking runs. These color bands shall be applied at each electrical distribution/panel board, low current system control panels and junction box locations and at 15 m centers within an area. B.
NAIROBI OPERATIONAL HUB 6. Sizes and types of protective devices. 7. Sizes and types of incoming and outgoing cables. 8. Contacts location references of relays and other control devices (if any). B. Charts shall be typed on A4 size sheets. They shall be enclosed in a clear plastic envelope and shall be securely fixed to the inside cover of the unit. Additional copies of the charts shall be included in the Operation and Maintenance Manuals. 2.05 CABLE IDENTIFICATION TAGS A.
NAIROBI OPERATIONAL HUB C. 2.07 For buried low current/communication cables or duct banks, use warning tapes as per the standard practice of Local Telecom Supplier and applicable international standards. CABLE MARKERS A. Buried cables shall be permanently identified by concrete markers. The markers shall be 600 mm square x 100 mm thick with impressed character; they shall be made of grade 20 concrete, with 10 mm aggregate.
NAIROBI OPERATIONAL HUB C. D. Warning/Danger signs made of red plastic (vinyl) with white letters at least 25 mm high reading "DANGER High Voltage" shall be fixed to the entrance doors of all 11 kV switchgear and transformer rooms.
NAIROBI OPERATIONAL HUB C. D. On equipment with only one access door, the danger sign and the identification number shall be centered on the vertical centerline of the door, with the horizontal centreline of the danger sign 300 mm below the top edge of the door and the horizontal centreline of the identification number 250 mm below the danger sign centerline.
NAIROBI OPERATIONAL HUB CONDUITS PART 1 – GENERAL 1.01 GENERAL A. B C D 1.02 PVC conduits shall generally be allowed in CAST-IN-SITU. Surface installed Conduits (below or above false ceiling) shall be rigid steel (GI). Where heavy protection against mechanical damage is required only rigid steel (GI) conduit shall be used. All conduits and conduit fittings shall comply with concerned local authorities Specifications In precast concrete slabs etc.
NAIROBI OPERATIONAL HUB 1.05 SUBMISSION A. B. Cut away samples with manufacturer's details. Shop drawings of proposed conduit layouts PART 2 - PRODUCTS 2.01 STEEL CONDUITS (G.I Conduit) Steel conduits shall be heavy gauge steel conduit hot dip galvanized inside and outside. The steel conduits, all junction boxes and other accessories shall be accordance with British Standard 4568 Parts 1 and 2 and shall be Class 4. The internal diameter of conduits shall be not less than 20mm.
NAIROBI OPERATIONAL HUB metal enclosures of apparatus. All conduit ends shall be reamed to remove sharp edges and threads shall be of sufficient length to enable conduits to butt within couplings or to the stop end in box spouts. Draw-in boxes on straight runs shall be provided at not more than 9000mm centers. Where right angle bends are formed in the circuit, draw-in boxes shall be provided at not more than 7500mm centers and not more than two right angled bends shall be employed in any one run.
NAIROBI OPERATIONAL HUB All joints between conduits and fittings shall be watertight using vinyl cement recommended by the manufacturer of the conduit. A vinyl solvent shall be used for permanent joints and a cement of the type that shall remain in a sticky condition shall be used for expansion couplers. A separate insulated earth wire shall be drawn into all PVC conduits. The PVC conduits shall be installed generally in accordance with the requirements set out for metal conduits.
NAIROBI OPERATIONAL HUB All boxes installed in exterior locations, plant rooms, ducts etc, shall be fitted with approved type gaskets to provide a waterproof seal between box and Cover or other item fitted to the box. PART 3 – EXECUTION 3.01 PVC conduits and fittings shall be joined by using sealing cement (vinyl solvent paint) to ensure a watertight joint. The cement shall be of a type that remains in a sticky condition.
NAIROBI OPERATIONAL HUB 3.07 Flexible conduits shall be used for connection of motors, HVAC equipment, recessed light fittings ...etc. Fixed conduits shall be terminated in a conduit box and flexible conduit shall then connect to the equipment. 3.08 For flexible conduit on earth wire shall be wound around the flexible conduit and connected at each end to earth terminal. 3.09 The conduit system shall, in general, be surface mounted in all plant rooms, electrical rooms and in Service Tunnel. 3.
NAIROBI OPERATIONAL HUB *** END OF SECTION *** UNOPS Building, UN Lane, Off UN Avenue P.O Box 783,Village Market, 00621 Nairobi, Kenya Tel: +254 20 7621120 E-mail: info@unops.org Website: www.unops.
NAIROBI OPERATIONAL HUB UNDERGROUND ELECTRICAL SERVICE PART 1 - GENERAL 1.01 A. 1.02 SECTION INCLUDES Underground Electrical Services including, but not limited to the following: 1. Trenching and backfilling. 2. Manholes, hand holes and earth rod pits. 3. Cable warning signs and tapes.
NAIROBI OPERATIONAL HUB 1.03 16772 Audio Visual, Conference, Interpretation System 16960 Building Surveillance System (CCTV) REFERENCES A. The IEE Wiring Regulations, 16th Edition (2001). B. BS 4568 Rigid Steel Conduits, Zinc Coated. C. BS 6099-2.2 / IEC 614-2-2 U.P.V.C. Rigid Conduits. 1.04 SUBMITTAL A. Submit for complete and detailed manufacturer's catalogues and data relating which shall include, but not limited to, the following: 1. Name of the manufacturer. 2. Country of origin. 3.
NAIROBI OPERATIONAL HUB B. 1.05 Provide samples of proposed devices together with the above submittal for approval of the Engineer. QUALITY ASSURANCE A. All items for underground electrical services shall be as per manufacturer's standard construction and materials except civil works such as excavation, backfilling and concreting. Where this contradicts any part of the Specifications, the Contractor shall state so at the time of tender. B.
NAIROBI OPERATIONAL HUB D. In preparing for laying the pipes in trenches, the pipes and fittings may be unloaded along the trench direct from the back of a truck. Ducts and fittings should be unloaded on the side opposite to backfill. Fittings including end bells, couplings and other accessories such as solvent cement and lubricant shall be stored at the trench site under cover to prevent loss or damage. E.
NAIROBI OPERATIONAL HUB A. Duct banks shall be either direct buried type or concrete encased type, as applicable and required on site. B. Heavy duty rigid PVC conduits shall be used for direct buried or concrete encased underground duct systems. PVC conduits and fittings shall comply with the requirements of Section 16130 C. PVC conduit shall be suitable for a temperature range of 4 °C to 90 °C.
NAIROBI OPERATIONAL HUB K. An expansion joint of 55 mm per 100 meters maximum shall be provided in the duct banks. Additionally, a construction joint shall be installed if pouring of concrete is commenced any time after initial set of adjacent concrete. Neither expansion nor construction joints shall be installed under a roadway. L. For duct banks in stable soils, the soil below the duct bank shall be compacted to 90 % of maximum density to a minimum depth of 300 mm.
NAIROBI OPERATIONAL HUB D. The duct bank manhole/interface shall include an expansion joint to take up longitudinal movement due to expansion and construction of the duct bank. This joint shall also act as water stop to prevent water from seeping inside the manhole. E. The exterior of the manhole shall be waterproofed, with a bituminous coating in accordance with Section 03300. F. Each manhole shall have two cable pulling irons opposite each duct bank entrance. G.
NAIROBI OPERATIONAL HUB C. 2.07 The cover of earth rod pits shall have appropriate marking as approved by the site Engineer. CONCRETE PADS A. Concrete pads shall be provided for all pad mounted equipment. B. Concrete pads shall be 150 mm high, unless otherwise indicated, complete with steel reinforcement and necessary bolts, anchors, etc. required for the proper installation of pad mounted equipment. C.
NAIROBI OPERATIONAL HUB B. Examine the areas and conditions under which the underground electrical services are to be installed, and correct any unsatisfactory conditions detrimental to the proper and timely completion of the work. The Contractor shall not proceed with the work until all unsatisfactory conditions have been corrected in a manner acceptable to the Engineer. 3.02 EXCAVATION AND BACKFILLING A.
NAIROBI OPERATIONAL HUB F. Changes in direction of duct bank runs shall be accomplished by using special couplings limited to 5 degrees and/or 45 degrees bends having a 1 m radius sweep with straight sections of ducts between changes of direction and `S' sweep sections having a minimum of 500 m offset. G. Where duct bank enters manholes, conduits shall terminate in end bells. Clean each conduit thoroughly before laying.
NAIROBI OPERATIONAL HUB D. 3.05 The PVC coated rigid steel transition bend or conduit shall extend minimum 150 mm above grade. A concrete envelope 100 mm high above the finished floor shall be formed around such risers to minimize corrosion at point of emergence. The top of the envelope shall be sloped for drainage. CONSTRUCTION OF MANHOLES AND HANDHOLES A. Manholes and handholes shall be constructed of precast or cast-in situ concrete to sizes shown on the Drawings.
NAIROBI OPERATIONAL HUB *** END OF SECTION *** UNOPS Building, UN Lane, Off UN Avenue P.O Box 783,Village Market, 00621 Nairobi, Kenya Tel: +254 20 7621120 E-mail: info@unops.org Website: www.unops.
NAIROBI OPERATIONAL HUB CABLES AND WIRES PART 1 - GENERAL 1.01 All cables shall be designed for operation in systems where continuity of supply is the first consideration. They shall also be satisfactory in operation under the variations of current, voltage and frequency as may be met under fault and surge conditions on the system. All materials shall be of the best quality and of the class most suitable for working under the particular condition of the systems.
NAIROBI OPERATIONAL HUB 1.06 Each end of each cable shall be provided with identification label lettered with feeder or circuit designation to the Engineer's instructions. The labels shall be permanently fixed in distribution boards, terminal boxes, isolators, etc. and shall be made of durable material ensuring permanent legibility. 1.
NAIROBI OPERATIONAL HUB All cable terminations shall comply with the concerned local authorities requirements. 1.08 TESTS - The cables shall be factory tested in accordance with the applicable standards, codes or recommendations. - For each cable type, the following test certificates, providing tests have been carried out shall be submitted to the Engineer for approval. - Mechanical properties of insulation and sheathing components. - Resistance to cracking. - Pressure test at high temperature.
NAIROBI OPERATIONAL HUB PART 2 - PRODUCT 2.01 PVC INSULATED/PVC SHEATHED CABLES These shall be 600/1000V, single or multi-core conforming to BS 6346 with high conductivity plain annealed stranded copper conductors to BS 6360, PVC insulated with an extruded layer of PVC bedding and a final outer extruded PVC sheath. The insulation and sheath shall be to BS 6746 with insulation coloured to identify phases and neutral in accordance with BS 6746 C.
NAIROBI OPERATIONAL HUB 2.04 FLEXIBLE CORDS Flexible cords shall be circular silicon rubber insulated glass fiber braided, three core 300/500 volts and shall comply with BS 6500. The conductors shall be tinned, annealed copper and the core shall be coloured Brown, Blue, Green/Yellow for identification. 2.05 MICC CABLING/WIRING In all hazardous areas the cabling/wiring shall be done with MICC cables/wires. The decision of the engineer in respect of choosing such areas will be final and binding.
NAIROBI OPERATIONAL HUB PART 3 - EXECUTION 3.1 GENERAL Cables/wires shall be installed as per the concerned local authorities regulations. Where no concerned local authorities regulations exist IEE regulations shall be followed. 3.2 EXAMINATION A. B. C. 3.3 Verify that interior of the building has been protected from weather Ensure that all raceways are thoroughly cleaned. Verify that all construction works likely to damage wires /cables have been completed. INSTALLATION A. B. C. D. E. F.
NAIROBI OPERATIONAL HUB SUPPORTING SERVICES PART 1 - GENERAL 1.01 VOLTAGE All single phase devices shall be rated for 240/V 50 Hz and all three phase devices shall be rated for 415/V 50Hz. 1.02 DESCRIPTION Provide wiring devices including switches receptacles, switchfuse units, junction boxes, control devices etc. as specified, indicated on drawings and as required for proper functioning. 1.03 RELATED WORKS SPECIFIED ELSEWHERE A. B. C. 1.
NAIROBI OPERATIONAL HUB Metal Clad Boxes BS 5733 Weather Proof Socket outlets BS 1363/1984 Sentry Socket outlet BS 7288/199 Where No reference Standard is mentioned the applicable BS standard shall apply UNOPS Building, UN Lane, Off UN Avenue P.O Box 783,Village Market, 00621 Nairobi, Kenya Tel: +254 20 7621120 E-mail: info@unops.org Website: www.unops.
NAIROBI OPERATIONAL HUB PART 2 - PRODUCTS 2.01 SOCKETS A. Sockets shall be 250V, three pin, 16A switched type to BS 1363. Safety shutters shall cover pin holes to prevent accidental contact. Contact arrangement shall be such that contact is made on two sides of the rectangular pins of plugs. B. UPS Socket outlets should be differentiated from the normal supply socket outlets by color (RED). C. Sockets shall be fixed inside galvanized stamped steel boxes which shall be flush mounted in walls. D.
NAIROBI OPERATIONAL HUB 2.02 JUNCTION BOXES The junction boxes shall be DP 250V or TP 415 with current rating as shown on drawings or indicated in schedules. DP or TP switch controlling Junction Box shall be provided with neon lamp. Floor mounted J.B. shall be of water tight design as required by the particular equipment being fed through the J.B. Indoor Wall mounted Junction box and its associated switch shall White moulded & provided with flex outlet. 2.03 2.04 SWITCHES A.
NAIROBI OPERATIONAL HUB Remote control potentiometer unit shall be used for electronic dimmable ballast shall be used. It shall have a rotary switch for ‘ON\OFF’ function and a control voltage range with “MAX” and “MIN” trimmings. 2.05 FUSED SWITCHED OUTLETS (If needed for any particular equipment) These outlets shall be to BS 4662 and provided with fuse links to BS 646 or BS 1361 or BS 1362 complete as required. 2.
NAIROBI OPERATIONAL HUB Where Skirting & dado application are involved UPVC trunking of elegant profile shall be used. The system shall be capable of accepting wide range of components offering wide range of configurations. It shall be possible to use flat tees or angles & various type of adapters to navigate. The trunking system shall be manufactured with requirements of BS 4678: Part 4 & BS 4662. Copies of test certificates shall be provided by the suppliers. 2.12 ISOLATORS AND SWITCH FUSES A.
NAIROBI OPERATIONAL HUB otherwise required for specified uses e.g. Above bench or near the equipment etc. 3.2 FIXING A. B. 3.3 Fix outlet boxes securely Fix exposed outlet boxes to permanent inserts or lead anchors with machine screws. LIGHTING SWITCHES Locate at the strike side of the door. 3.4 PULL BOXES /JUNCTION BOXES A. B. 3.5 Fix pull boxes at minimum 10 Meter spacing and to limit the number of bends in conduit to not more than two 90 deg.
NAIROBI OPERATIONAL HUB MAIN DISTRIBUTION EQUIPMENT PART 1 – GENERAL 1.01 1.02 DESCRIPTION A. The main distribution equipment shall comprise main low tension switch boards, switching metering panels, main and sub-main switch boards, distribution boards, isolators, switch fuses ...etc. B. The supply and distribution arrangement shall be as indicated on schematic diagrams in the Drawings. C. The equipment shall be assembled and tested in the factory of the approved local panel builder/manufacturer.
NAIROBI OPERATIONAL HUB IEC 947 (Part 1-7) IEC 439 (Part 1-4) 1.03 RELATED WORKS Section 16110 Section 16120 Section 16200 Section 16300 Section 16620 Section 16635 1.04 Low Voltage Switchgear & Control Gear Low voltage Switchgear & control gear assemblies Raceways Conduits Cables and Wires Supporting devices Diesel Generator Earthing SUBMISSION A.
NAIROBI OPERATIONAL HUB C. The panel shall be of the cellular cubical type class 2CC FBA and shall be of the folded sheet steel construction fabricated out of electro galvanized cold rolled sheets of minimum 2mm thickness for body and frame work and not less than 1.5mm for doors and cover plates. D.
NAIROBI OPERATIONAL HUB M. The switch boards shall contain the air circuit breakers, bus bars, bus couplers, MCCBs, instruments, earth bus, ...etc. as specified here under and as per drawings with ratings and arrangement as shown on the Drawings and shall be complete with all internal wiring and connections. N. The switch boards shall be tested at the manufacturer’s premises as well as commissioned after installation in accordance with tests stipulated in IEC 439. O.
NAIROBI OPERATIONAL HUB The bus bars shall be provided with colored PVC sleevings at regular intervals for phase identification. Painted bus bars may be acceptable in special cases when panels are manufactured/assembled in Jordan. 2.03 AIR CIRCUIT BREAKERS A. The air circuit breakers shall be of the air break trip free draw out type with the main contacts encased in a reinforced polyester casing and offer double insulation from the operators on the breaker front face.
NAIROBI OPERATIONAL HUB B) C) D) E) F) G) Main Contacts Open ‘Off’, Springs Charged, Springs Discharged Service Position, Test Position, And Isolated Position For Drawout Mechanism. D. Any attempt to withdraw or insert the breaker when it is ‘ON’ shall trip the breaker automatically. An interlocking shall be provided to prevent insertion of a circuit breaker having a rating higher than the current rating of the ACB cradle. E.
NAIROBI OPERATIONAL HUB overcurrent protection shall be adjustable from 2 times the current up to the circuit breaker electrodynamical withstand. The earth protection shall have current settings from 10 per cent of the rated current 1200 A in steps of 10 per cent. The time delay setting shall be variable 100 millisecond to 400 millisec in steps of 100 millisec. 2.04 J.
NAIROBI OPERATIONAL HUB be semi-flush mounted and shall be approximately 100 x 100mm square. Accuracy shall be one percent of full scale values. Moving elements shall be provided with zero adjustments external to the cases. 2.06 C. Ammeters shall be moving iron type, to B.S. 89 scaled 0-2000 A for main incoming supply. D. Voltmeter shall be moving iron type to B.S. 89 scaled 0-500V and provided with 6-position selector switches allowing reading of line to line and line to neutral voltages. E.
NAIROBI OPERATIONAL HUB rating to the secondary side and the counter or the meter shall be calibrated to read the primary Kwh passing through the current transformers. 2.07 L. The current transformers shall be of the ring or slide on busbar type. M. Three current transformers of 2000/5A shall be provided for each meter. N. All meters shall be handed over to the concerned local authorities for Calibration before final erection and connection. FUSE SWITCHES A. 2.
NAIROBI OPERATIONAL HUB clearly indicates the three positions ‘ON’, ‘OFF’ and ‘TRIP’ thus indicating clearly abnormal conditions of the circuit. In order to ensure suitability for isolation complying with IEC-947-2, the operating mechanism shall be designed such that the toggle or handle can only be in OFF position if the power contacts are all actually separated.
NAIROBI OPERATIONAL HUB comply with appendix B of IEC 947-2 standard. They shall be immunised against nuisance tripping as per IEC 255 and IEC 801-2 to 801-5 standards H. MCCB with ratings upto 250A shall be equipped with thermal magnetic or electronic trip units which are fully interchangeable types. The breakers with ratings over 250A shall be equipped with electronic trip units which shall remain operational for ambient temperatures upto 60°C.
NAIROBI OPERATIONAL HUB upto 80A 100A to 160A 250A to 350A 350A and above N. 2.09 100/125A frame size 250A frame size. 400A frame size. 630A frame size Each MCCB’s shall have minimum 2 pairs of NO /NC auxiliary contacts EARTH LEAKAGE RELAYS A. Earth Fault Relay a. b. c. d. e. f. g. h. B. The relays shall comply with IEC 755 The relays shall be protected against nuisance tripping caused by switching surges or by lighting surges.
NAIROBI OPERATIONAL HUB e. 2.10 The maximum link resistance from toroid to relay link must not exceed 3 ohms. Current operated earth leakage relays shall be used either in conjunction with circuit breakers for tripping the breakers or for giving alarm signal only by an indicator lamp and alarm bell in cases of earth leakage.
NAIROBI OPERATIONAL HUB 2.12 G. The earth bus shall have adequate rating and length for connecting the incoming and outgoing earth wires or tapes. H. The distribution boards shall be complete with all necessary internal wiring and connections J. High conductivity copper bars or rods covered by coloured PVC sleeving for phase identification shall be employed for connections of 200A and higher. For smaller connections PVC insulated cables to B.S.
NAIROBI OPERATIONAL HUB B. In corridors DBs enclosure shall be housed in electrical closets. All electrical closets shall be of the same size with architectural finishes as required. C. All risers falling in areas like corridors or important rooms shall be provided with an hinged access door with finishes as required by architect. D. The main isolating switch shall be of SPN or TPN air break design.
NAIROBI OPERATIONAL HUB mentioned on the drawings. MCB can be reverse fed without reduction in performance. Trip setting as indicated on the schedules of points. The MCB shall have thermal overload trip to accept 5% overload and to trip at 30% of rated current as per IEC 947-2. The instantaneous magnetic trip shall operate at 5 to 10 times the rated current for 1P, 2P, 3P or 4P breakers. It shall be possible to replace 3 single phase units with one 3 phase unit.
NAIROBI OPERATIONAL HUB RCCBs shall be available in 2 and 4 pole versions with current ratings from 16A to 100A and an earth leakage trip rating as specified in the schedule of points. They shall be suitable for operation on 415V, 3 phase, 4 wire, 50 Hz supply. They shall have an operating temperature from -5 to + 60° C. RCCB shall have a trip indication on the front face by a red mark. It shall be possible to achieve vertical discriminations with RCCBs.
NAIROBI OPERATIONAL HUB M PULSE RELAYS Pulse relays shall be suitable AC or DC operation as per system manufacturer Normal practice. The operation voltage may be 240V 50Hz or 24V DC The pulse relay shall be suitable for actuation manual through built-in Push button. 2.
NAIROBI OPERATIONAL HUB Contractor to provide complete coordination / selection table prepared by the soft starter manufacturer and indicating clearly the recommendation components such as fuses, breakers, contractors and overload relays so as to achieve Type – 2 coordination as per IEC guidelines. These components shall be from the same manufacturer for easy substitution and consistent operational reliability of the equipment. Mixing of brands is wholly unacceptable.
NAIROBI OPERATIONAL HUB Further as a minimum, the following volts-free signals shall be made available: Fault Overload Ramp-up complete Power circuit The following features shall be provided as standard: - Start and stop ramp to be achieved using reduced voltage triggering of thyristors connected in antiparallel, with each phase individually doubleprotected by adequate snubber circuits and varistors to withstand 4kV at 2.5Hz for 60 seconds or more. - Diode-thyristor paralleling in unacceptable.
NAIROBI OPERATIONAL HUB - Basic trouble-shooting guide (if not already included in the ops manual) General The equipment shall be compliant with the following wrt operation: - - 2.15 Rated installation voltage of 690Vac. Starter shall be typically for minimum 6 starts per hour (subject to application type and kW rating) For units used in continuous running with fewer starts, a bypass contactor recommended by the soft starter manufacturer shall be used to minimize heat loss.
NAIROBI OPERATIONAL HUB 2.16 D. Starters shall have in addition to the auxiliary contacts required for interlocks, alarms, BAS, and controls two additional sets of normally open and normally closed contacts. E. Motor Protection against the short-circuit shall be achieved by motor circuit breakers of moulded case type and the combination with controlcommand devices (Breaker + Contactor + Overload relay) shall be of type 2 co-ordination as defined by the IEC standards 947-4.1.
NAIROBI OPERATIONAL HUB Wherever specified/indicated, the stabilizer shall be constructed on booster transformer principle. The rating of the stabilizer shall be as indicated on drawings or as specified in the B.O.Q Technical Requirements Ambient Temp. Cooling type Input Output up to 50 °C Natural air cooled 415V AC ±15% at 50Hz 415V AC±2% at 50 Hz The stabilizer shall be equipped with filters for transients, compensator for unbalanced load in 3 phases, protection against faults and malfunctions.
NAIROBI OPERATIONAL HUB cleated in harness form, or shall be enclosed in purpose made plastic trunking or troughing. Wiring cleated to metal surfaces shall be insulated from the metal. Where wiring runs through sheet steel panels, holes shall be grommeted with suitable grommets. 3.02 G. Connect small wiring associated with external circuits to terminal strips conveniently arranged. H.
NAIROBI OPERATIONAL HUB LIGHTING SYSTEM PART 1 1.1 1.2 GENERAL GENERAL REQUIREMENTS A. The work of this Division shall be governed by the following documents: 1. Conditions of Contract. 2. Instructions to Tenderers. 3. Form of Agreement. 4. General and Special Conditions of Contract. 5. Form of Tender. 6. Appendices. 7. Applicable Divisions. B. Comply with requirements of Section 16010 electrical General Provisions. C.
NAIROBI OPERATIONAL HUB programmable low voltage switching. 1.3 E. Emergency lighting and exit signs shall be connected as shown on drawings. F. External lighting shall be contactor controlled incorporating photo electric master control. QUALITY ASSURANCE A. 1.4 Acceptable Manufacturers. 1.
NAIROBI OPERATIONAL HUB Fxture (Recessed type) i. For the lighting fixture (recessed in F.C) the contractor shall obtain from he ceiling manufacturer a 3m x 3m sample of the ceiling assembly for the Jebsum F.C. The fixture manufacturer shall finalize the details and dimensions the fixture recessed to be coordinated with and accommodate the ceiling assembly. ii. Inform the engineer fourteen (14) days in advance of the assembly being completed and obtain the consultant approval for the assembly. E.
NAIROBI OPERATIONAL HUB 1.5 DESIGN CRITERIA Generally, all luminaires have been selected to achieve the underlisted illumination levels for the reflectance’s of surfaces applicable, and a maintenance factor of 80% 90%: Min. Service Location/Function Illuminance (LUX) Archives Conference Room Corridors Entrance Hall Mechanical Plantroom Meeting room Offices Public Areas Pump Room Stairs Store L.V.
NAIROBI OPERATIONAL HUB PART 2-PRODUCTS 2.1 LUMINARIES - GENERAL A. Standards 1. IEC Standard 61 - Lamp Caps and Holders. 2. IEC Standard 64 - Tungsten Filament Lamps. 3. IEC Standard 81 - Tubular Fluorescent Lamps. 4. IEC Standard 82 - Ballasts for Tubular Fluorescent lamps. 5. IEC Standard 155 - Starters for Fluorescent Lamps. 6. IEC Standard 188 - High Pressure Mercury Vapor Lamps. 7. IEC Standard 259 - Miscellaneous Lamps & Ballasts. 8.
NAIROBI OPERATIONAL HUB luminaire, a separate terminal block shall be provided in an adjacent junction box connected back to the luminaire in heat resistant (135oC) cable of adequate size. 7. All luminaires shall be suitable for connection to rigid conduit, and/or flexible circular sheathed cable. 8. all weather-proof luminaires shall be fully suitable for outdoor use and shall not deteriorate after extended use in the ambient site conditions state. 9.
NAIROBI OPERATIONAL HUB frequency of 35-40kHz. iii) Transformer for LV Halogen lamps. Transformer operating at high frequency (approximately 35 kHz) with constant secondary voltage, built in overload and short circuit protection and automatic re-set, harmonic filter, RFI suppression clip on terminal covers with strain relief. 5. All luminaires shall be designed for operation from a 230 volt 50 Hz single phase supply, unless specifically indicated otherwise on the Drawings. 6.
NAIROBI OPERATIONAL HUB 2. All discharge luminaires used in external applications shall comply with the requirements of Standards and shall be minimum of IP 54 unless indicated otherwise in the following Luminaires Data Sheets. 3. All luminaires shall be designed for operation from a 230 volt 50 Hz single phase supply, unless specifically indicated otherwise on the Drawings. 4. all luminaires shall incorporate, within the base, a cable connector suitable for accepting 6.0 sq.mm conductors.
NAIROBI OPERATIONAL HUB Mains Frequency - 50Hz Power consumption - 7.5W/9VA Insulation Class Battery Re-charge Period Approvals - Lamps -Fluorescent 58W,8w 1 9.66V/4Ah 24 hr. BSI/IEC 598-2-22 lamps-T26-18W,36W & -Compact Fluorescent TCL 24W & 36W Lamp - TCD 18W Ballast Lumen Factor F. 18W – 0.46 36W – 0.20 58W – 0.15 24W – 0.26 36W – 0.20 18W – 0.
NAIROBI OPERATIONAL HUB 3. Lamps shall be of BI-PIN cap B15d. Lamps shall be in accordance with the following schedule. Wattage Base Intensity 50W I. J. 2000cd 2000 Normal Voltage Halogen Lamps 1. They shall be of the single ended, double enveloped type. 2. They shall be suitable for operation from 230V/50Hz, Single Phase AC. 3. They shall be suitable for universal burning positions. 4. They shall be in accordance with the following schedule. Wattage Base Lumen Life (Hrs.
NAIROBI OPERATIONAL HUB 1. They shall be single ended, with two or more narrow fluorescent tubes, as shown on luminaire schedule 2. Colour appearance shall be day light. 3. They shall be in accordance with the following schedule. L. Wattage Base Lumen 18W G24d-2 1200 Life (Hrs.) Output 5000 26W G24d-3 1800 5000 24W 36W 2GII 2GII 1800 2900 5000 5000 Discharge Lamps 1. All discharge lamps shall comply with IEC Standard 188 2.
NAIROBI OPERATIONAL HUB A. Shall be bilingual, details as shown in the following documents and to the approval of Civil Defense authorities: - Signage and Graphics - Luminaire Schedule - Electrical Drawings - Data Sheets included herein. UNOPS Building, UN Lane, Off UN Avenue P.O Box 783,Village Market, 00621 Nairobi, Kenya Tel: +254 20 7621120 E-mail: info@unops.org Website: www.unops.
NAIROBI OPERATIONAL HUB PART 3 EXECUTION 3.1 INSTALLATION GENERAL A. Refer to Section 16010. 3.2 INSTALLATION OF LIGHTING FIXTURES AND LAMPS. A. Provide all lighting fixtures and lamps shown on the drawings luminaires schedule and data sheets attached herein. B.
NAIROBI OPERATIONAL HUB I. Provide safety chains on all surface mounted or suspended fixtures. J. The final connection to all luminaries integrated into suspended ceilings shall be by means of flexible heat resisting cable terminated at a plug and sockets ceiling rose mounted in the ceiling void directly adjacent to the luminaire. All such ceiling roses shall be appropriately rated to suit the rating of the associated subcircuit protective device.
NAIROBI OPERATIONAL HUB SECTION 16620 EMERGENCY DIESEL GENERATOR PART 1 - GENERAL 1.01 1.02 GENERAL REFERENCE A. The work of this Section is integral with the whole of the Contract Documents and is not intended to be interpreted outside that context. B. Coordinate the work with all other services affecting the work of this Section. C. Diesel Generator submittal without compliance statement from the manufacturer shall not be acceptable. DESCRIPTION OF WORK A. 1.
NAIROBI OPERATIONAL HUB APPLICABLE STANDARDS REFERRED TO IN THIS SECTION A. B. 1.04 BS 5514: Engines BS 4999: Alternators QUALITY ASSURANCE A. Manufacturer's Qualification 1. The generator set shall be the product of a single manufacturer regularly engaged as a manufacturer of such equipment. The engine, alternator, control panel shall be designed, manufactured, assembled and tested by single manufacturer.
NAIROBI OPERATIONAL HUB 1.06 SUBMITTALS A. Shop Drawings 1. Submit 3 copies of shop drawings for approval. 2. Shop drawings shall be complete, as to be as-built drawings, not general outline drawings used for sales and guide layouts. 3.
NAIROBI OPERATIONAL HUB Service Facilities 1. Indicate the nearest location from which service facilities and spare parts may be obtained after the guarantee period. Test Reports 1. Submit certified copies of data obtained during factory test of the engine generator test. Operation and Maintenance Data 1. Submit certified copies of data obtained during factory tests of the engine generator test. a) Manuals for generator set. b) Detailed instruction books. c) Operator's manuals. d) Maintenance schedules.
NAIROBI OPERATIONAL HUB 2. Do not store equipment assemblies exposed to weather. 3. Physically protected all generator equipment against damage from work of other trades. 4. Cover all generator equipment with suitable material to avoid damage to finish. UNOPS Building, UN Lane, Off UN Avenue P.O Box 783,Village Market, 00621 Nairobi, Kenya Tel: +254 20 7621120 E-mail: info@unops.org Website: www.unops.
NAIROBI OPERATIONAL HUB PART 2 - PRODUCTS 2.01 EMERGENCY GENERATOR SET A. The set shall be of rugged reliable design and built for long trouble free service under the worst specified climatic conditions and made by an approved reputable manufacturer. B. The rated output shall be (as indicated on drawings) at 0.8 PF 240/415 Volts, 3 phase and 50 Hz. The rated output shall mean the net full continuous derated output in Palestine at ambient temperature up to 45 Degree C, at relative humidity 50%.
NAIROBI OPERATIONAL HUB The engine starting control equipment shall be arranged to disconnect the battery charger to prevent it from being over-loaded during starting. The starter motor shall be of adequate power of its duty ii) Batteries for starting shall be of the nickel cadmium type, 24V, and heavy-duty diesel starting type and of sufficient capacity to provide continuous cranking of 1.5-minute duration without recharging. Batteries should have sufficient capacity to provide three successive starts.
NAIROBI OPERATIONAL HUB temperature of cooling water at safe limits at all conditions of load required in the Specifications. Maximum temperature of cooling water after 10 hours of Continues running at full load at worst Palestinian climatic conditions shall not exceed the maximum temperature limits of the diesel engine. 4. e) The cooling system shall include an engine shaft driven circulating water pump.
NAIROBI OPERATIONAL HUB Carbon residue : 19750 0.01/wt diesel index : 62 Viscosity redwood seconds at 100F : 34 b) Daily Fuel Tank An integeral day tank located under the Generator set shall maintain fuel supply to the engine.
NAIROBI OPERATIONAL HUB additional valves that may be required by local regulations. iii) 5. All piping shall be provided with ground joint unions at piece of apparatus to facilitate connecting and disconnecting. iv) All piping, unless otherwise specified, shall be schedule 40 standard weight black wrought iron pipe. v) Steel vent pipelines shall run from the fuel oil storage tanks, carried to the proper height within building construction and terminating with vent fittings. Fitting as required.
NAIROBI OPERATIONAL HUB 6. 7. Exhaust System a) Exhaust pipes shall be of Schedule 40 black for easy steel and of adequate size to ensure that back pressure does not exceed the value specified by the manufacturer. b) The exhaust pipe shall be connected through airtight flexible coupling to the engine. c) Exhaust pipes shall be adequately lagged with 75 mm thick (minimum) rock wool covered with aluminum sheaths so that to take care of exhaust gas temperature in pipes exceeding 500 Deg. C.
NAIROBI OPERATIONAL HUB the element and the lubricating oil is to be replaced should be stated. c. Intake and Exhaust System Air is inducted to the engine manifold through. i) Pre-cleaner ii) Large capacity air cleaner. Both filters are required due to severity of dust suspensions in the air. The engine exhaust line shall be fitted with flexible fitting efficient silencer to give efficient silencing with minimum back pressure and terminated outside the engine room. 8.
NAIROBI OPERATIONAL HUB comply with the relevant BS. The vibratory force induced as the engine passed through resonance revolutions during starting and stopping period shall not cause any damage to the whole system. 11. Engine Monitor Panel a) Each engine shall be provided with a monitor panel adequately isolated from vibration, which shall contain facility to monitor the following: i) Engine speed. ii) Temperature. iii) Engine operation hour counter. iv) Other required items.
NAIROBI OPERATIONAL HUB 4. Distortion of no-load voltage waveform at alternator terminals shall be within 5% from the sinusoidal waveform. 5. Voltage adjustable range of the output voltage by adjusting the exciter shall be not less than 3% of rated voltage at rated load and not less than + -5% of rated under no-load conditions. This adjustment shall be able to be performed from panel mounted handle or knob. 6.
NAIROBI OPERATIONAL HUB Alternator components shall be sound electrically and mechanically in continuous operation lasting over 24 hours at the rated output. 15. Insulation Resistance Insulation resistance of the machine at strategic points shall be provided with the offer submitted with the shop drawings. 16. Dielectric Strength The dielectric strength, the voltage of testing and test procedure at various points of the machine shall be submitted with the shop drawings. 17.
NAIROBI OPERATIONAL HUB c) 2.02 connectors. Labels for wiring designation marks shall be provided on the fixed portion of the terminal boards as well as wires. No live metal shall be exposed at the back of the terminal boards. Terminal boards having pressure type terminal lusts or equivalent shall be used so that no terminal clamp is necessary. 10% spare terminals shall be provided for each terminal board assembly. CONTROL BOARD A. Cabinet 1.
NAIROBI OPERATIONAL HUB - Under speed / Over speed - loss of engine speed detection - low/ high Battery voltage - under volts/ Over volts - under freq / over freq - over current 5. The control shall be UL508 listed, CSA282-M1989 certified, and meet IEC8528 part 4. All switches, lamps and meters shall be oil-tight and dust-tight, and the enclosure door shall be gasketed. There shall be no exposed points in the control (with the door open) that operate in excess of 50 volts.
NAIROBI OPERATIONAL HUB automatically be switched off 10 minutes after the switch is depressed, or after the switch is depressed a second time. e) Generator Set AC Output Metering: The generator set shall be provided with a metering set including the following features and functions: 2.5-inch, 90-degree scale analog voltmeter, ammeter, frequency meter, and kilowatt (KW) meter. These meters shall be provided with a phase select switch and an indicating lamp for upper and lower scale on the meters.
NAIROBI OPERATIONAL HUB g) Weak battery (alarm) Low fuel-daytank (alarm) High ac voltage (shutdown) Low ac voltage (shutdown) Under frequency (shutdown) Over current (warning) Over current (shutdown) Short circuit (shutdown) Ground fault (alarm)(optional--when required by code or specified) Over load (alarm) Emergency stop (shutdown) In addition, provisions shall be made for indication of two customer-specified alarm or shutdown conditions.
NAIROBI OPERATIONAL HUB vi) Control Functions: The control system provided shall include a cycle cranking system, which allows for user selected crank time, rest time, and number of cycles. Initial settings shall be for 3 cranking periods of 15 seconds each, with 15 second rest period between cranking periods. The control system shall include an idle mode control, which allows the engine to run in idle mode in the RUN position only. In this mode, the alternator excitation system shall be disabled.
NAIROBI OPERATIONAL HUB readout to indicate setting level. The voltage regulation system shall include provisions for reactive load sharing and electronic voltage matching for paralleling applications. Motorized voltage adjust pot is not acceptable for voltage matching. Controls shall be provided to monitor the output current of the generator set and initiate an alarm when load current exceeds 110% of the rated current of the generator set on any phase for more than 60 seconds.
NAIROBI OPERATIONAL HUB vii) 2.03 Control Interfaces for Remote Monitoring: All control and interconnection points from the generator set to remote components shall be brought to a separate connection box. No field connections shall be made in the control enclosure or in the AC power output enclosure. Provide the following features in the control system: Form "C" dry common alarm contact set rated 2A @ 30VDC to indicate existence of any alarm or shutdown condition on the generator set.
NAIROBI OPERATIONAL HUB 2.04 COMMISSIONING A. B. Simulated Power Failure Test Engine - generator shall be made ready for automatic operation and started by means of the test transfer switch on the automatic transfer switch. Unit shall run for the duration of all time delays and then automatically shut-down. This test shall be made with unit operating, and twice with unit simulated for a starting failure. Testing of the Set 1.
NAIROBI OPERATIONAL HUB c) 2.05 2.06 2.07 Engineer shall be carried out at the expense of the Contractor. The performance test shall be for 24 hours under the worst climatic conditions prevailing in Jordan. The Contractor shall be fully responsible to provide all the necessary facilities for the test at his own expense. SYSTEM RESPONSIBILITY A.
NAIROBI OPERATIONAL HUB C. 2.08 The D/G Sub-Contractor shall be fully responsible for the satisfactory operation of the D/G installation during the Maintenance and Guarantee Period. He shall carry out necessary inspection, preventive maintenance and testing to keep the set ready all the time. The set shall function satisfactorily during power failures. The D/G Sub-Contractor shall carry out routine testing of the installation once in every two weeks throughout the maintenance and Guarantee Period.
NAIROBI OPERATIONAL HUB 2.09 AUTOMATIC TRANSFER SWITCH / ATS/. The panel for the diesel generator set) shall include: 1. 2 x 4 pole contactors AC1 category, complete with mechanical and electrical interlock and of suitable rating. 2. Phase failure, phase rotation, overvoltage and under voltage unit protection unit with built in adjustable time delay of 0-10Sec. 3. Set of timers for: a) delay gen. Loading b) delay return of supply. c) Delay gen. Start. d) Gen. Cool down time. 4.
NAIROBI OPERATIONAL HUB PART 3 - EXECUTION 3.1 3.02 INSTALLATION A. GENERAL 1. The engine and generator shall be properly aligned and mounted on a common steel base through resilient mountings to prevent vibrations. The whole set shall be fixed on the concrete slabs through suitable number of adjustable spring type vibration isolators. Foundation and other builder's work shall be as recommended by the manufacturer and approved by the Engineer. 2.
NAIROBI OPERATIONAL HUB 3.04 DETAILS OF PROPOSED EQUIPMENTS FOR D/G SET To be filled and signed by Tenderer and submitted with the offer with supportive engineering catalogues, otherwise the offer may not be considered: A Generating set Generating set Assembler’s Name and Address : ------------------- Diesel Engine Manufacturer's Name and Address : ------------------- Type of Engine & Model No. : ------------------- No. Offered Output : ------------------- B.H.P. at N.T.P.
NAIROBI OPERATIONAL HUB Alternator (Kg) : ------------------- Complete set (Engine + Alternator + Common bed) (Kg) : ------------------- Dimensions Overall length of set (ft) : ------------------- Overall width of set (ft) : ------------------- Overall height of set (ft) : ------------------- B. Cooling Water System i.
NAIROBI OPERATIONAL HUB B.H.P. consumed : ------------------- Method of drive : ------------------- C. Fuel Daily Service Tanks Dimensions Height- cms. : ------------------- Width - cms. : ------------------- Depth - cms. : ------------------- Storage capacity gallons : ------------------- Material : ------------------- D. Alternator Manufacturer's Name & Address. : ------------------- Model No. : ------------------- Rated voltage : ------------------- Rated frequency-Hz.
NAIROBI OPERATIONAL HUB A.C. generator of self excited & rotating rectifier : ------------------- Max. temp. rise Deg.C : ------------------- Enclosure : ------------------- Class of insulation : ------------------- Type of rectifying elements of rectifier : ------------------- F. A.T.S. 1 Manufacturer's Name and Address : ------------------- Model No.
NAIROBI OPERATIONAL HUB K. Output : ------------------- Voltage : ------------------- Rated current amp. : ------------------- L. Instruments Ammeter to read the amp.
NAIROBI OPERATIONAL HUB 16630 3 Phases Modular UPS Unit. PART 1 GENERAL This specification describes a continuous duty, solid state, Modular uninterruptible power supply system, module 20KVA expandable to 40KVA OF 10KVA each module, hereafter referred to as the UPS. The UPS shall operate in conjunction with the building electrical system and the generator to provide high quality power for Telecommunication systems.
NAIROBI OPERATIONAL HUB the batteries, up to 10 min time or until restoration of the normal power supply. The operation and control for the UPS shall be provided through the use of microprocessor controlled logic. The system shall provide an alarm indication 10 minutes before the reserve power failure and shall provide automatic shutdown of the non essential equipment at the end of a programmable time. PART 4 MODES OF OPERATION The UPS shall be designed to operate in the following modes: 4.
NAIROBI OPERATIONAL HUB Once the source is synchronized, the static bypass transfer switch shall transfer the load from the by-pass source to the UPS inverter to ramp into the load and then disconnecting the bypass input source. 4.05 Maintenance Bypass/Test Mode Internal switches shall be provided to isolate the UPS inverter output and static bypass transfer switch output from the AC bypass input source and the load.
NAIROBI OPERATIONAL HUB g. Acceptable load power factor: 0.9 lag to 1 h. Acceptable overload: 60 sec : 150% 1h : 110% i. Acceptable crest factor without downgrading: Unlimited j. Overall efficiency: up to 94% 4.10 Rectifier/Battery Charger Incoming AC power shall be converted to regulated DC output by the rectifier/battery charger. A phase controlled bridge rectifier shall provide regulated DC voltage which is subsequently filtered to provide power for the inverter and battery charging functions.
NAIROBI OPERATIONAL HUB 4.11 Low Resistance microporous glass fiber as a separator (The electrolyte is absorbed within this material ) Each battery shall provided with molded lifting handles. System Status and Control The UPS shall be provided with a system status and control panel to provide monitoring and control of the complete system. The UPS shall be equipped with a self test system identifying the faulty subassembly in the event of a problem.
NAIROBI OPERATIONAL HUB c. Load on standby mains. d. General Alarm. D. Also the following signaling shall be available. a. b. c. d. e. PART 5 Battery problem. Manual charging cycle running. End of battery autonomy. Manual bypass in maintenance position. Standby mains outside tolerance limits. Submittals: Catalog & Documents for the UPS & Batteries. Certifications. Recommended spare parts. Delivery Period. Manufacturer Training for 1 trainee. Warranty for 2 years.
NAIROBI OPERATIONAL HUB EARTHING PART 1 - GENERAL 1.01 SECTION INCLUDES A. Grounding System including, but not limited to the following: 1. Grounding rods. 3. Grounding connection bar. 2. 4. Grounding conductors. Grounding of various systems. 1.02 RELATED SECTIONS A. Electrical Works, General. B. Electrical Identification. C. LV Cables and Wires. D. Underground Electrical Services. 1.03 REFERENCES UNOPS Building, UN Lane, Off UN Avenue P.
NAIROBI OPERATIONAL HUB A. British Standard Code of Practice CP1013 - Grounding. B. BS 7671 IEE Wiring Regulations, 16th Edition. 1.04 SUBMITTALS A. Submit manufacturer’s data, illustrated leaflets, dimensions, fixing details and description of the proposed products. 1.05 QUALITY ASSURANCE A. Manufacturer’s: Firms regularly engaged in the manufacture of Grounding equipment, whose products have been in satisfactory use in similar service for not less than 10 years.
NAIROBI OPERATIONAL HUB PART 2 PRODUCTS 2.01 GENERAL A. All the materials required for Grounding system shall be furnished new and undamaged in accordance with the requirement stated in this section. B. Conduct soil electrical resistively tests at four locations (minimum) advised by the Engineer. The Grounding calculations based on the test results shall be submitted for Engineers approval, to demonstrate that the proposed design of Grounding system complies with the specifications and standards. C.
NAIROBI OPERATIONAL HUB PART 3 EXECUTION 3.01 INSPECTION A. Examine the area and conditions under which the Grounding systems are to be installed and correct any unsatisfactory conditions detrimental to the timely and proper completion of the work. Do not proceed with the work until the conditions are satisfactory in a manner acceptable to the Engineer. 3.02 GROUNDING CONDUCTORS INSTALLATION UNOPS Building, UN Lane, Off UN Avenue P.
NAIROBI OPERATIONAL HUB A. Standard sizes of stranded copper conductor used for Grounding continuity shall be according to the requirements of IEE Wiring Regulations, 16th Edition.. B. Suitable Grounding facilities, acceptable to the Engineer, shall be furnished on electrical equipment to consist of compression type terminal connectors bolted to the equipment frame or enclosure and providing a minimum of joint resistance. C. The conduit system shall not be considered as continuous for Grounding purposes.
NAIROBI OPERATIONAL HUB L. Except for sub-stations and electric rooms, the exposed Grounding conductor shall run in protective pipes for runs below 900 mm from floor level. Pipe shall also be provided at locations where conduct is likely to be subject to physical damage. M. Extensions from Grounding loop as shown on the Drawings shall be provided for connection to electrical equipment. Connect the Grounding conductor to the equipment, Grounding bus, pad or lug.
NAIROBI OPERATIONAL HUB B. Supplementary bonding conductors shall conform to the requirements of Section 547-03 of the IEE Wiring Regulations and shall have a minimum cross-sectional area of 2.5 mm2 where mechanically protected and 4.0 mm2 where not so protected. C. Main equi-potential bonding conductors shall conform to the requirements of Section 547-2 of the IEE Wiring Regulations and shall have a minimum crosssectional area of 6.0 mm2. 3.08 FIELD QUALITY CONTROL A.
NAIROBI OPERATIONAL HUB DATA SYSTEM PART 1 GENERAL 1.01 1.02 GENERAL A The data System shall comprise of Supply, installation, testing & documentation for a category 6A cabling for the mentioned project provisional. B Separate raceways shall be used for the data system. C All runs of raceways shall be accessible for modifications or maintenance. D Any additional ductwork, encasement works /raceways required shall be the responsibility of the electrical contractor.
NAIROBI OPERATIONAL HUB Not all the mentioned items specified in the specification are required in the contract, some items shall be submitted and installed by others, refer to B.O.Q. for included items. 1.
NAIROBI OPERATIONAL HUB 1.05 TESTING & COMMISSIONING Acceptance testing shall be carried out by the contractor & witnessed by the owner personnel. The contractor shall provide all necessary instruments & accessories required to perform the testing. 1.06 WARRANTY The system supplier shall warrant to repair or replace & make good at its expense any material found defective during a period of fifteen years from the date of the acceptance certificate. 1.07 1.08 RELATED SECTIONS A.
NAIROBI OPERATIONAL HUB PART 2 PRODUCT 2.01 DATA BACKBONE Technical specifications: 2.1.1 FTP CAT6A (4 PAIRS) CABLES Installation cables category 6A, Enhanced, FTP The pair-shielded 100ohm installation cables are suitable for voice, and data transmission at frequencies of up to 250 MHz. Dimensions: 4 x 2 x 0.58mm. Cable construction Sheath Material LSOH Color Grey, RAL 7035 Conductor Diameter (mm) 0.58 Insulation Diameter (mm) 1.
NAIROBI OPERATIONAL HUB Resistance unbalanced, max (%)2 Optical braid overage (%)41 Transfer impedance, IEC 96-1 1 MHz (ٱ/m) 5 10 MHz (ٱ/m) 10 Nominal velocity of propagation (NVP)c 0.75 Mutual capacitance, nominal (pF/m) 48 Capacitance unbalanced, max. (pF/m) 1000 2.1.2 FTP RJ45/3M CONNECTION MODULES (FOR DATA) The Cat. 6A connection modules are the connection modules that comply with the latest standard proposals of the international standardization bodies.
NAIROBI OPERATIONAL HUB Contact resistance < 20 milliohm (shield - shield) Insulation resistance > 500 mega ohm (500 VDC) Dielectric strength 1000 Veff. 50 Hz/1 min (conductor - conductor) Dielectric strength 1500 Veff, 50 Hz/1 min (conductor - shield) Coupling resistance IEC 96-1 1 MHz < 15 milliohm 10MHz< 100 milliohm Mechanical Data Material Polycarbonate, (UL 94V-0) Mating cycles > 1000 Wire diameter 0.5 mm (AWG 24} - 0.65 mm (AWG 22) Insulation diameter 0.8 - 1.
NAIROBI OPERATIONAL HUB PART 3 EXECUTION 3.1 All installation work shall be as per Data Transmission rules and regulations. Where no regulation is available, IEE wiring regulation shall be followed. 3.2 The maximum horizontal portion of a cabling system from work area information outlet to a mechanical termination at the patch-panel in the wiring closets must not be more than 90 meters, the cable run must be free of bridges, taps & splices. Cabling shall be as per ISO /IEC IS11801 Standards. 3.
NAIROBI OPERATIONAL HUB SECTION-16800 - APPROVED MANUFACTURER LIST Material Manufacturer Main Distribution Boards a) b) Instruments and Meters .
NAIROBI OPERATIONAL HUB Wires and Cables a) Lighting and Power,and Low voltage(FA,PAVA,..) SYNERGY(locally) DATA - Structural a) Cables and Accessories Sockets and patch panels b) CAT6A 3M,R&M,DATWYLER RJ45/3M, R&M DATWYLER c) 24PORT P.
NAIROBI OPERATIONAL HUB (White) Fire Alarm System-Analogue/ Addressible(UL) b) c) a) Simplex (USA) Edwards (Canada) Notifier (USA) Lightning System a) b) Furse (UK) Helita pulsar (France) Earthing System a) b) Locally/according to engineer approval Locally/according to local authority Builders work a) Locally/according to engineer approval ACCESS CONTROL a) b) GE or equal(enterprise) HONYWEL (Public Address & Voice Alarm (PAVA) a) TOA (Japan) b) BOSCH (Holland) CCTV (UL) a) b) a) AXIS
