EL QAA RECREATIONAL SPACES UNDP
ELECTRICAL SPECIFICATIONS
BASIC ELECTRICAL MATERIALS AND METHODS
PART 1 - General Requirements
General
The scheme includes all work of an electrical nature connected with the electrical services . All services must be carefully coordinated to provide a complete working installation. Works, materials, equipment or services not specifically mentioned in these clauses but mentioned or implied in other must check on the exact method of connecting up to the power supply brought to the substation and allow for coordinating with and receiving approval of the Electricity Authority. The L.V. shall be 3 phase and neutral 220/380 volts, 4 wire earthed neutral system.
Scope of work
The scope covers the supply to site, complete erection and installation, site testing, commissioning, and setting to work of all the necessary materials and equipment required for this installation as detailed in the specification and as shown on the drawings comprising the following :
Main clauses of these specifications or indicated on the drawings must be included as part of the contract.
Submain distribution boards, secondary distribution panel including all fixing supports, equipment protection, instrumentation, etc...
Connections to submain distribution board, main distribution board and necessary connection to equipment.
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ELECTRICAL SPECIFICATIONS
Lighting and power including all light points and fittings, supports, wires, conduits, electrical switches, socket outlets, plugs including supply and devices to all equipment requiring power.
Earthing system, including all wires, cables, rods, pits and any expense in providing satisfactory tests for the satisfaction of the Engineer, that satisfactory earth connection has been established.
Supply and installation of isolators and electrical outlets to serve equipment.
All additional sundry equipment or materials necessary to form a complete and comprehensive installation whether specifically mentioned in the specifications or not, but which normally form part of such an installation.
Testing of installation and taking over.
Design drawings :
The drawings supplied with the specifications are indicative only. The Contractor is required to submit complete shop drawings.
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ELECTRICAL SPECIFICATIONS
Shop drawings :
Before commencing with the work, the Contractor shall prepare and submit detailed shop drawings for all equipment and distribution services described herein. The Contractor shall submit all drawings for approval within the time specified. Large scale details shall be 1/10. Signed and approved drawings shall not be departed form, unless a signed variation order or site instruction is issued in writing by the Engineer. Drawings returned to the Contractor for alteration or amendment are to be resubmitted to the Engineer for approval. The contractor shall be responsible for any discrepancies, errors, or omissions in the drawings and other particulars supplied by him whether such drawings and particulars have been approved by the Engineer or not, provided such discrepancies, errors, or omissions are not due to inaccurate information or particulars furnished in writing to the Contractor by the Engineer.
Design drawings :
The Contractor shall submit drawings showing accurately the general layout of the whole installation and equipment. The exact routing of cables, conduits, cable ducts, cable trays, etc., are to be detailed by the Contractor, together with supports, exact sizes of conduits and trunking to be used in each location, and number and sizes of cables and wires run into conduits. The exact positions of lighting fittings and equipment shall be shown. Detail drawings are required for distribution boards showing exact method of fixing and locating and showing feeder cables. Diagramatic charts showing schematically each electrical system and designation of each panel circuit breaker etc., are also required.
As built drawings :
As per conditions of contract, the Contractor shall supply the Engineer with "as installed or as built drawings" all in accordance with the requirements for "shop drawings" updated to show the exact way the equipment have been installed. These drawings shall be on reproducible negatives.
Circuit and System Layout :
Before starting on any work connected with the electrical installation, the Contractor shall secure the approval of the Engineer to the whole of the layouts and the positioning of cable and conduit runs,
GN ELEC /3 EL QAA RECREATIONAL SPACES UNDP
ELECTRICAL SPECIFICATIONS junction boxes, boards, fittings and accessories etc... It is particularly important that all requirements are complied with and full approval is obtained.
Guarantee :
The Contractor shall guarantee in writing to the Engineer that all electrical works installed by him shall be free from any and all defects in workmanship and materials, and that all equipment shall withstand variations in temperature, load and atmospheric conditions which arise under working conditions without undue distortion, deterioration or setting up of undue stresses and strains in any part of such magnitude as to offset the strength and suitability for the various parts. It shall also be guaranteed that all equipment have or will perform the capacities and characteristics indicated on the drawings or specified, and that if during a period of ONE YEAR from date of the certificate of completion and acceptance of his work, any such defects in workmanship, materials or performance appear, he will promptly remedy them to the satisfaction of the Engineer. All costs involved in carrying out this work shall be to the Contractor's expense.
Accessibility
All work shall be so designed and installed as to be easily accessible for operation, maintenance and repair.
Rejection
All work shall be carried out to the satisfaction of the Engineer. Any work refused by the Engineer shall be removed and rebuilt and replaced by the contractor at no cost to Engineer in a satisfactory manner as governed by this specification. All work disturbed, injured or destroyed in the course of removal of the said work shall be made good at the contractor's own expense.
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ELECTRICAL SPECIFICATIONS
Erection
The Contractor shall be responsible for organizing his work as shall be necessary to enable him to execute the works, keep the site reasonably clean, remove all waste material as it accumulates and as directed by the Engineer. The Contractor shall provide all lifting beams and slings for moving and erecting equipment on site, unless otherwise specified. He also shall provide, erect, alter as required and alternatively remove all temporary scaffolding required to facilitate erection of works.
Storage of Materials and Equipment
All materials and equipment are to be stored in a manner as not to obstruct the work of others. It shall be adequately protected at all times against corrosion, deterioration and the ingress of foreign matter. All equipment must be kept clear of the floor or ground by means of wooden bearers or other approved means.
Safeguard to Equipment
It shall be the Contractor's responsibility to safeguard by means of temporary or permanent supports or otherwise all cables, pipes and equipment and other materials and equipment which would be liable to suffer damage if such precautionary measures were not taken.
Safeguard to Equipment
Temporary and permanent safeguards shall be to the approval of the Engineer.
Safeguard to personnel
All "Live" parts of electrical equipment shall be protected in such a way as to adequately safeguard from injury all personnel working on or in the vicinity of equipment. Wherever possible, all protective guards shall be supplied by the equipment manufacturer. All precautioning means must be taken to safeguard all personnel against site hazards.
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ELECTRICAL SPECIFICATIONS
Standards and Regulations
All the electrical installation shall be in accordance with the International Electro-technical Commision (IEC) recommondations and the following codes :
UTE manufacturing standards. NFC 13-100 for high voltage power supply. NFC 15-100 for meduim voltage power distribution. NFC 17-100 for low voltage systems. NEC. BS 7671 (The IEE wiring regulations).
However, the Contractor may offer materials and equipment to alternative standards provided such items conform to the real intent of the specifications and approval is obtained for these alternatives. All equipment and materials to be incorporated in the works shall be brand new bearing stamped ratings as required and must be approved by the Engineer prior to their use.
Omissions
If anything necessary to the proper installation or operation of the electrical system is omitted from the drawings and specifications, or if indicated incorrectly, the Contractor shall immediately call the attention of the Engineer to this Omission or inaccuracy, before work drawings are prepared. Should the Contractor fail to do so, he shall be held responsible and shall make good at his own expense such errors or any damages caused by such Omissions.
Samples
Samples of parts, fittings and fixtures shall be submitted to the Engineer by the Contractor for approval before work commences. The parts used in the work done by the Contractor shall not vary in any manner from the samples submitted and approved.
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ELECTRICAL SPECIFICATIONS
Tests
The completed systems shall be thoroughly tested before putting into operation. Tests shall be carried out by the Contractor under the supervision of the Engineer. Any modifications or repairs necessary upon completion of the tests shall be made good at the Contractor's expense. The Contractor shall provide all testing equipment and materials. All electrical equipment shall be clean and adjusted on site before application of power.
The following tests shall be carried out :
Wire and cable continuity tests.
Insulation resistance test phase to phase, phase to neutral, phase to earth, of all circuits and equipment using a 1000 volt megger.
The megger reading shall not be less than one meg-ohm.
Earthing system and earth pits resistances and continuity. The resistance between system and earth loop must not exceed (1/2) ohm.
Operating tests of all protective relays, contactors, etc. to proove their correct operation before energizing the main equipment.
Operating tests of all circuit breakers, equipment instruments, starters etc.
Operation of all power and lighting circuits.
Operation of all emergency systems.
Polarity and phase rotation tests.
Tests of lighting fittings, lighting levels, equipment and lamps showing conformity to guaranteed performance within plus or minus five percent.
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ELECTRICAL SPECIFICATIONS
Climatic Conditions
All equipment are to be designed and tested to insure that they are suitable for the conditions prevailing on site. Due consideration should also be given to local rises of temperature in unventilated areas, and areas that will have increased temperatures due to emission of heat from equipment. All equipment and materials to be continuously rated and rated in an approved manner for the ambient temperatures in which they will be installed. Particular care should be taken to insure that any plastic components, are suitable for the high temperatures that may be involved. Unless otherwise indicated, the ambient design temperature shall be taken as 35 C.
Equipment Not Contract (NIC)
Certain items of control and other equipment are indicated on the Electrical Drawings for connection, but are specified in other sections pertaining to Special Equipment, Plumbing, Air conditioning etc... Such items are not supplied as part of the electrical works, however, all connections to such equipment shall be done under this section.
Manufacturers
The components parts of each electrical system or piece of equipment shall be the latest product of a single manufacturer unless otherwise specified, and provided that such components, manufactured by different manufacturers are of standard design and dimension, so that inter-changeability is possible. Approval of a manufacturer does not necessarily constitute approval of his product as equal to that specified. It shall be the contractor's sole responsibility to as certain that the listed approved manufacturer is capable of supplying the required materials and or equipment and in full conformity with the Engineer's specifications.
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ELECTRICAL SPECIFICATIONS
Personnel Training and Documents
The Contractor shall be responsible for training of the personnel provided by the Engineer. In this respect, he will provide for a period of one month, the necessary qualified staff to train the Engineer's personnel who will take-over responsibility and maintenance of the installation. It is understood that this will not relieve the Contractor from his duties and responsibilities stipulated under clause "Guarantee". The training will not be allowed to begin unless the contractor provides the Engineer with 5 copies of "Catalogues", "Technical Data" and "Maintenance Manuals" relevant to the installation.
PART 2 - Medium And Low Voltage Distribution
All panel boards shall be manufactured to the latest IEC recommandations, specially IEC 430 and NFC 60 410, NFC 60 412.
The equipment shall be suitably constructed for safe, proper and reliable operation without undue wear, corrosion, heating or other operating trouble. The design and arrangement details of the equipment shall be subject to the approval of the Engineer. The arrangement of the equipment within in the assemblies shall be such as to afford maximum accessibility to all parts, incoming and outgoing wires and cables. The assembly shall be completely wired and tested at the factory ready for installation when received at the site. Bracing shall be provided to prevent distortion in handling and shipping. The assembly shall be suitably braced for short circuit duty. Bolts, nuts, studs, and screws shall have threads conforming to accepted Standards, and shall be supplied in accordance with the latest approved practice for the duties involved. All bolted contact connections shall be electro-silver plated to a tickness not less than 0.1 mm. Approved name plated, permanently mounted for identification of all major and control equipment shall be supplied with each unit of assembly. Nameplates shall be laminated phenol engraved with 5mm white letters of a black background. Nameplates shall be written in English. All compartments shall be suitably sanded and rust- inhibited after fabrication, painted on coat of rust inhibiting primer and two enamel finish coats to inside and outside surfaces. Colour shall be to the approval of the Engineer.
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ELECTRICAL SPECIFICATIONS
In general, manufacturer's standardized construction is desired. All components of the assembly shall be the product of a single manufacturer who shall also perform all assembly work. Structural steel base shall be provided for securing entire assembly to floor. The contractor must of an early stage provide the Engineer with all the necessary manufacturer's details and shop drawings concerning the assembly to allow him to check the design of the concrete structure, particularly concerning the loads, the overall dimensions and the cable and grouting holes.
Construction of the Assembly :
The assembly shall be of the size, rating and arrangement to the approval of the Engineer. The complete assembly shall be ground mounting type with matching cases to form continuous internal structures. The assembly shall consist of a completely enclosed, self- supporting metal structure, containing circuit protective devices and all other associated equipment as specified, under other clauses, and/or the approval of the Engineer. The assembly shall consist of the required number of formed and welded sheet steel enclosures required to mount circuit protective devices and other equipment. Bolted frames shall be provided at the rear to support and house copper busbars, cables and other accessories. Front, side and top plates shall be steel, removable and not less than 2mm thickness. All fastenings between structural members shall be bolted, not welded, to provide flexibility during installations. Removable panels shall be provided at the front of each vertical section. The arrangements shall permit cables to enter bottom and top of the enclosure and connect to their respective terminals without interference. The assembly shall be provided with cable racks and bolting down holes. A modular individual mounting arrangement shall be used to permit inter-changing different sized device cover plates without additional drilling of structure. Structure and buses shall be arranged to permit future sections to be added. Suitable cover plate must be provided for temporary protection. The assembly shall be weatherproof to IP 433 protection. Complete maintenance shall be carried out from the front enabling the assembly to be mounted against a wall.
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ELECTRICAL SPECIFICATIONS
Busbars :
Main horizontal busbars fully rated to the approval of the Engineer shall be provided across the top or bottom of each structure. Each structure shall also be complete with vertical copper buses to distribute incoming power to each outgoing circuit protective device in the structure. Neutral shall be fully sized, and unless otherwise indicated, shall extend through the entire length of the distribution board. The board bussing shall be plated and of sufficient cross- sectional area to continuously conduct rated full load current with a maximum average temperature rise of 30° C above the ambient temperature. All bus connections shall be bolted and clamp type terminals provided for cables. All bus work and connections shall be accessible for inspection and maintenance purpose. An earthing bus bar of same rating as live conductor shall extend through the entire length of the assembly.
Shop Drawings :
The Contractor shall submit shop drawings for the boards including schematic diagrams with all protective device control instrument and dimensions of the assembly, etc... Any modification required by the Engineer of the local power authorities to allow the equipment to comply with the codes, standards and specifications called for hereinbefore shall be carried out with no extra cost.
Distribution board
The main distribution board shall be of the totally enclosed, free standing type, made of galvanized sheet steel of 2mm minimum thickness properly reinforced and braced, made up of vertical sections. Each incoming circuit shall occupy a cubicle with its own door. It shall be properly ventilated and vermin proof and specially treated for anticorrosion. The board shall be constructed to be suitable for interchangeability of breakers and for future extension. The board shall be suitable for top or bottom cable connections, and shall be provided with gland plates, removable for drilling on site.
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ELECTRICAL SPECIFICATIONS
Electrolytic copper busbars shall be of sufficient size to limit the temperature rise to 55° C and adequately braced/supported to withstand mechanical stresses/forces exerted during short circuit conditions, when directly connected to a power source having short circuit currents of Sixty Kilo amperes (60,000 amperes rms). All connections shall be tightly bolted. An earth bar, of the appropriate size extending over the entire length of the board shall also be included. The busbars shall be supported on insulators of the 1000V. grade. The board shall be provided with adequate lifting means and shall be capable of being rolled or moved into installation position and bolted directly to the floor without the use of floor sills. Each switching and protective device shall be provided with visible means of ON-OFF identification. All terminals shall be of the anti-turn solder less type suitable for copper or aluminum cables. All control wiring shall be completely protected with fully rated porcelain fuses. All live terminals and component parts under voltage shall be properly isolated from the distribution board structure. The board structure shall be securely connected to the earthing system. The board shall be supplied with all the necessary wiring, cables, boxes and fixing materials, and free from distortion and welding strains. The board shall be so designed, that inspection, maintenance and repair can be easily carried out. The board shall be of manufacturer's standard construction wired and tested at the factory before delivery to site. The incoming shall be provided with one ammeter and current transformer on each phase, one voltmeter with 7 position selector switch, three pilot lights. Ammeters and voltmeters shall be moving iron square type size 96x96mm. Current transformers shall have adequate short circuit rating. Pilot lights shall be transformer operated with low voltage incandescent lamp, with high brightness and long life lamp colors to comply with IEC standards. A clear legend plate shall be fixed to each push button, pilot light, switch etc...
Lighting and power panel board
Panel boards shall comply with NFC 63.410.
The Contractor shall supply and install lighting and power panel boards where necessary and to the approval of the Engineer.
Panel boards shall be factory assembled.
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ELECTRICAL SPECIFICATIONS
Panel boards shall be rated for 415 volt service and ampere rating as approved.
Panel boards shall be weatherproof to IP 433 protection.
The panel boards bus assembly shall be enclosed in a galvanized sheet steel cabinet. Cabinet shall be of sufficient size to provide a minimum gutter space of 100mm on all sides. The thickness of the sheet steel shall be 1mm minimum. Fronts shall include doors and have flush, brushed stainless pulls. The flush lock shall not protrude beyond the front of the door. All panel boards locks shall be keyed a like. Fronts shall have adjustable indicating trim clamps which shall be completely concealed when the doors are closed. Doors shall be mounted by completely concealed steel hinges. Fronts shall not be removable with door in the locked position. A circuit directory card shall provide a space at least 5mm high x 70mm long or equivalent, for each circuit. The directory shall be of typed to identify the load fed by each circuit. Front shall be of code gauge, full finished steel with rust-inhibiting primer and bakek enamel finish.
Joints shall be welded, galvanized and reinforced where necessary and galvanized after fabrication.
Bus for connections to the branch circuit breakers shall be of the "Distributed Phase" or "Phase Sequence" type.
Three-phase bussing shall be such that any three adjacent single pole breakers are individually connected to each of the three different phases in such a manner that two or three pole breakers could be installed at any location. All current carrying parts of the bus assembly shall be plated.
Main and neutral buses shall be minimum 90 percent conductivity rectangular copper bars, provided with bolted type lugs as necessary.
Buses shall be suitably braced for short circuit duty as required.
Buses shall be rigidly supported and insulated and be so designed that branch circuits can be removed without disturbing adjacent units or changed without additional machining, drilling or tapping.
Necessary bussing drilling and blank plates shall be provided for installation of future circuits.
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ELECTRICAL SPECIFICATIONS
All screws and bolts used for making copper connections shall be equipped with lock washers. Riveted connections will not be acceptable.
Mains shall be equipped with solderless pressure indent type connectors and have means to prevent swiveling of connector.
Neutral busbar shall be full size and shall incorporate one neutral terminal for each single pole way.
Aluminum shall not be used for any interior panel board parts.
Buses, connectors, and terminal shall be silver plated to a minimum thickness of 0.1mm.
An acceptable connection bar for equipment earthing conductors shall be provided with a minimum number of cable terminations equal to the single pole number of ways of the panel board.
A cable connection shall be made from the earth bar to the cable/ gland of the incoming feeder as applicable.
PART 3 - Circuit Breakers
Codes and Standards :
Circuit breakers shall comply with NFC 15 - 100. Short circuit performance shall comply with NFC 63-120 and IEC 157, including make-break tests at up to 50 KA RMS and 100 KA peak.
General Description :
Circuit breakers shall be arranged and mounted so that their operation is not likely to injure the operator and shall be trip free from all positions. Circuit breakers shall be indicated clearly whether they are in the closed or open position. Circuit breakers shall be marked with their rating and this marking shall be durable and visible. Short circuit breaking capacity shall also be shown on the breaker.
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ELECTRICAL SPECIFICATIONS
Circuit breakers shall have the proper terminals to accommodate the cable sizes specified and they shall have auxiliary contacts wherever required for signaling, interlocking, etc... All circuit breakers shall be properly derated for the ambient temperature and be suitable for operation on the system at 380 V., 3 phase, 4 wires, 50 Hz, with solidly earthed neutral. Three phase circuit breakers shall be designed to break all the poles simultaneously with a single mechanism and they shall have an arc quenching device on each pole. Back up fuses shall be used only if the circuit breaker for any valid reason cannot withstand what so ever the short circuit current that could occur. Air circuit breakers shall be four pole totally withdraw able type completely self-contained in an enclosed housing to be mounted in a switch-board cubicle without additional screening. It shall occupy a complete section, completely segregated from all other parts of the switchboard. Vent holes shall be provided in the side of the circuit breaker housing to provide thermal ventilation and also to permit easy air flow through the arc chutes when interrupting a short circuit. The circuit breaker shall be installed in a space greater than twice the breaker volume. The closing mechanism shall be of the independent motor operation type the speed of the closing of the breaker contacts being independent of the operator. A device shall be included to prevent a closing "misfire" if the breaker mechanism is held tripped during the closing operation. Tripping devices shall be dual characteristics series over current releases fitted to each phase, earth leakage release, minimum and maximum voltage releases. Over current current releases shall be indirect, operated by current transformer which shall have the facility to set to trip the breaker at currents between 75% and 150% of the breaker standard rated normal current. Earth leakage release shall be indirect, by means of current transformer which shall have the facility to set to trip the breaker at leakage currents varying from 0.03A to 10A. Minimum voltage release shall be indirect by means of electromagnetic coil set to trip the breaker at voltages ranging from 65% to 130% of the nominal voltage. All tripping devices shall provide appropriate remote signaling of their respective stators. All contacts subject to arcing shall be tipped with arc resistant material and shall require minimum maintenance after short circuit interruption. The main contacts shall be silver faced to ensure complete reliability in service under onerous current loading or ambient conditions.
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ELECTRICAL SPECIFICATIONS
The arc chutes shall be of special design employing steel splitter plates. The plates shall be arranged so that the arc is rapidily de-ionised while it is contained within the chute structure and the plate spacing shall be such that back pressure is minimized. The complete chute assembly shall be easily removed for routine inspection of the chute and contacts. Isolating contacts shall be multi-finger spring loaded type which shall be silver plated and shall require no attention. A front operated racking mechanism shall cause withdrawal of breaker. Access shall be via a lower front cover. Safety shutters of insulation material shall be provided to prevent access to live connections in the inspection position or when the breaker is completely withdrawn. Interlocks shall be provided to prevent the breaker being isolated unless it is in the OFF position and also to prevent the breaker being racked into the service position unless it is in the OFF position. Interlocks shall also prevent the breaker being accidentally pulled completely off the guide rail. Provision shall be made for padlocking the safety shutters when the breaker is completely withdrawn. Interlocks will be provided also to prevent parallel operation of normal and emergency air circuit breakers along with closing or opening of the bus-coupler. Locks shall be provided to prevent access to the time lag dashpots and racking mechanism, preventing unauthorised adjustment of the trip setting, also enabling the circuit breakers to be locked in the isolated position thus disconnecting the supply. An earth terminal shall be provided at the rear of the withdrawable breaker housings connecting to a plug and socket to provide an earth connection to the moving breaker portion. Contact shall be maintained in the breaker isolated position. Short circuit performance shall comply with NFC 63-120 and IEC 157, including make-break tests at up to 50 KA RMS and 100 KA peak. Mechanical endurance shall ensure over 10.000 operations with only minor maintenance. Suitable cable glands shall be provided for the support of the incoming supply cables. Molded case circuit breakers shall have quick-make, quick-break, toggle mechanisms and shall provide positive trip-free operation on abnormal overloads. Stationary and movable contacts shall be adequately protected with effective and rapid arc interruption. Each pole of the breaker shall be equipped with an inverse time delay thermal over current trip element and magnetic instantaneous over current trip elements for common tripping of all poles for multiple breakers. Multiple pole breakers shall have a single handle mechanism. Automatic tripping shall be indicated by the breaker
GN ELEC /16 EL QAA RECREATIONAL SPACES UNDP
ELECTRICAL SPECIFICATIONS handle assuming a clearly distinctive position from the manual ON and OFF position.
Molded case circuit breakers shall have frame sizes equal to or greater than their trip ratings unless otherwise indicated, with the following minimum RMS symmetrical interrupting capacities :
Frame Size 125 160 250 400 & above
Interrupting (KA) at 415V. 20 35 35 50
The bus-bar coupler shall be similar to air-circuit breaker specifications in all respects except for the interrupting capacity which shall be as indicated on the drawings.
Miniature circuit breakers shall be similar to molded case circuit breakers with respect to the mechanism of operation. They shall have minimum RMS symmetrical interrupting capacities equal to 10 KA at 415 V unless otherwise indicated.
Main Distribution Boards shall be similar to MERLIN GERIN TYPE G PANELS or approved equal.
Molded case circuit breakers shall be similar to COMPACT series of MERLIN GERIN or approved equal.
Miniature circuit breakers shall be similar to Multi-9 series of MERLIN GERIN or approved equal.
PART 4 - Conduit And Conduit Fittings (section 16111)
Metallic conduits shall comply with NFC. 121. (in machine rooms only) Non-metallic conduits and fittings shall comply with NFC 68.161 and NFC 68.121. The Contractor shall supply and install the complete system, including conduits, with all accessories fittings, boxes, etc., as required and as herein specified in an acceptable and workmanlike manner. Conduits and fittings shall be distinctively marked as manufactured for electrical purposes. The installation shall be made to avoid interference with pipes, ducts, structural members, or other equipment. The number of raceways shall not be less than that approved by the Engineer.
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ELECTRICAL SPECIFICATIONS
Non-metallic conduits shall be heavy gauge high impact rigid P.V.C., having a maximum continuous service temperature of 70 C, or more. Conduits and fittings shall comply with NFC 68.110. No conduit less than No:13 shall be used. Conduits shall be constructed from solid drawn mild steel, hot dipped galvanized both inside and out to a uniform thickness. Each conduit shall be straight, free from blisters and other defects, cut square and taper reamed. Couplings shall be galvanized both inside and outside including threading to ensure 100% galvanic protection on all surfaces. Flexible conduit shall be metallic comprising an empty spiral wire, inter-locked galvanized steel armour. Conduits shall match the rigid conduit system to which it is connected. All conduit work and plastering shall be completed before wires are pulled in unless otherwise permitted by the Engineer. Conduit shall be plugged with cork and boxes covered appropriately before plastering, to avoid filling with plaster. Conduit runs between outlets shall not contain more than three quarter bends, or the equivalent. The maximum run between two outlets shall not exceed 20 meters, for straight runs and 10 meters for run with one or more bends. Pull boxes shall be provided otherwise. Position of pull boxes shall be to the approval of the Engineer. Conduits shall be installed without causing any damage to the structural members. All bends shall be carefully made to prevent distortion of the circular cross section. Bends made on site in conduits shall have an inside radius of not less than nine diameters. Where bends of less than nine diameters are necessary, standard factory elbows shall be used. However the conduit size chosen shall be such as to permit a cable-bending radius within the factory elbow of at least eight times the cable diameter. Conduits in slabs shall be installed as close to the middle of the concrete slabs as practicable without disturbing the reinforcement. The outside diameter shall not exceed one-third of the slab thickness and conduits shall be placed not closer than three diameters on centres. Conduits in slabs shall be placed parallel to the main reinforcement steel in the slab. Top of any conduit shall be at least 20mm below the finished floor surface, unless otherwise authorized.
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ELECTRICAL SPECIFICATIONS
Conduits running parallel to beam axis shall not run above beams. Exposed conduits shall be installed parallel or at right angles to walls and ceiling beams. All changes in direction shall be made as far as possible with approved bends, elbows, and pull boxes. The spacing between parallel runs shall be uniform throughout. Unless otherwise approved conduits shall be held securely in place by standard factory spacer bar saddles, spaced at not more than 1 metre centres for non-metallic and 1.5 metre for metallic conduits. Expansion couplings shall be installed at every 8 metre run of exposed conduit work. Unless otherwise indicated, raceways concealed exposed above false ceilings shall be supported from the structure above the ceiling in the same manner as exposed raceways. Raceways shall not be supported from false ceiling supports. Couplings, expansion couplings, strap saddles, spacer bar saddles, spring clip saddles, conduits clips, adaptors, etc... shall all be standard factory conduit accessories. Adhesive used shall be a vinyl cement for fixed joints and a cement that remains flexible for expansion couplings sliding surfaces. Both cements shall provide watertight joints. Flexible conduits shall be used only for connections to motors, or to other equipment subject to vibration or adjustment. All conduits shall be carefully cleaned before and after installation. All ends shall be reamed free from burrs, and inside surfaces shall be free from all imperfections likely to injure the cable. After installation of each complete new conduit run, the run shall be snaked with a band to which shall be attached an approved tube cleaner equipped with an approved cylindrical mandrel of a diameter not less than 80 percent of the nominal diameter of the conduit. All conduits through which the mandrel will not pass shall be removed by the Contractor at his own expense. All field cuts in conduits shall be square, and cut ends shall be filed and shall have burrs removed. An insulating bushing shall be installed on each end of conduit, unless the connector is designed to prevent contact with the cut end. All connections shall be mechanically strong and tight, and made up properly with approved connectors. No running threads shall be permitted. Boxes of ample capacity shall be provided at every junction of conduit system and as required by the specifications. All boxes shall be securely fastened Blank plates shall be installed on outlet boxes in which no apparatus is installed, or the apparatus installed does not provide a suitable cover for box. Device boxes shall be used for all wiring devices.
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ELECTRICAL SPECIFICATIONS
Boxes for similar equipment shall be as approved. Device box shapes and sizes shall be determined by the type and size of wiring devices for which they serve. Lighting outlet boxes shall be circular. Outlets shall be plain with horizontal conduit connections where used exposed, or above false ceiling and shall be loop-in type where used embedded. Where so indicated lighting outlets be provided with ceiling roses of approved type and a flexible cord with a bayonet type lampholder. Metallic conduits shall be similar to ARNOULD MRB 9-PE or approved equal. Non-metallic conduits shall be similar to ARNOULD IRO APE or approved equal.
PART 5- Wires And Cables (section 16120)
Wires and cables shall comply with NFC 32.
The contractor shall supply and install all wires and cable necessary for the complete Electrical Installation, as required, and as herein specified, in an acceptable and workmanlike manner.
Conductors shall be of high conductivity annealed copper, with concentric stranding for stranded conductors.
Wires and cables for lighting and power systems in conduits shall be single core, PVC insulated, grated not less than 450/750 volts.
Cables for power system not in conduits shall be either unarmored single core.
Armored cables shall be PVC insulated, extruded PVC sheathed, multicore unless otherwise approved, galvanized steel wire or double tape armored, and overall extruded PVC sheathed and shall be of grade not less than 600/1000 volts.
Single core armored cable where used shall have a hard drawn aluminum wire armoring.
Cords used in pendant lighting points and between lighting outlet above false ceiling to lighting fixtures can be circular three core silicon rubber insulated, glass fiber braided, 300/300 V rated, and shall withstand an operating temperature of 150° C.
GN ELEC /20 EL QAA RECREATIONAL SPACES UNDP
ELECTRICAL SPECIFICATIONS
Cords used for extract fans shall be of plain annealed copper conductor, PVC insulated, circular three cores, PVC overall sheathed 300/500 V rated, and shall withstand an operating temperature of 70° C.
For the wiring of circuits consisting of wire sizes 6 mm2 and smaller such as for lighting branch circuits, self-insulated pressure type connectors shall be utilized for all splices or joints.
Cables 10 mm2 and larger shall be continuous and hence no connectors shall be used.
Connectors shall be manufactured from high conductivity copper, electro tin-plated.
Runs of trays shall be parallel or at right angles to walls. The trays shall be supported by hanger brackets every 1.5 meters.
The trays section shall have interned strenghtening flanges.
Trays shall be provided with a clipper cover.
All connectors, screws and fittings shall be manufactured from the same steel as their relative trays.
When trays is run with the cover underneath, it shall be provided with cable supports to prevent cables from failing out when covers are removed.
Cable retaining straps shall be positioned, approximately at 1.5 m. centers. The Electrical Contractor shall be responsible for ordering all necessary cable straps.
When trays is mounted horizontally, it shall be provided with cable separators for segregation of different equipment feeders and to allow for air space between cables.
Connections between trays and other types of raceways shall be made in approved manner with fittings manufactured for the purpose and application.
The earthing continuity of the trays shall be to B.S 4678.
GN ELEC /21 EL QAA RECREATIONAL SPACES UNDP
ELECTRICAL SPECIFICATIONS
Cable trays can be manufactured from mild steel sheet of a minimum thickness of 2mm. They shall be light duty type, with return flanges, and hot-dip galvanized finish. Bends corners, etc., shall be specially manufactured for the purpose. All accessories like bolts and nuts, cable ties and conduit clamps, shall be furnished as to function, to the manufacturers standards, and approval of the Engineer.
Cable glands shall be provided at the termination of armored cables, at the enclosure of a distribution board or any other equipment.
Cable glands shall be indoor or outdoor type, ordinary or weather-proof according to the location of the termination, to the approval of the Engineer.
The Contractor shall install as many wires and conduits as required and necessary for a complete electrical system, and shall provide adequately for the equipment actually to be installed.
Conductors shall be continuous from outlet and no splices shall be made except within outlet or junction boxes.
At every outlet and pull box, wires and cables passing through shall be left slack by an amount equivalent to 150 mm of cable length to allow inspection and connection to be made therein.
No cable bend shall have a radius of less than eight times its diameter.
All conductors to be contained within a single conduit shall be drawn in at the same time.
An approved wire pulling compound shall be applied to conductors being drawn through conduit.
Wires and cable for feeders, sub-feeders, control, and branch circuit wiring shall be color coded as follows :
Color Phase
Red 1 Yellow 2 Blue 3 Black Neutral Yellow/Green Equipment earth
GN ELEC /22 EL QAA RECREATIONAL SPACES UNDP
ELECTRICAL SPECIFICATIONS In no case shall wire and cable sizes be smaller than those required in the drawings.
Unless otherwise indicated, no conductor for light and Power wires shall be smaller than 1.5 mm2.
Branch circuits for lighting and appliances shall be either single conductor cables run inside conduits and for multi-conductor cables run on cable trays.
Feeders and sub-feeders shall be multi-conductor cables run on cable trays.
Single cables shall be fixed directly to walls or ceilings. Where 1 or more cables are run in parallel, thEy shall be fixed on galvanized steel perforated trays.
Cables shall be fixed to the supporting structures with approved galvanized case steel clamps at distances not exceeding 20 times the outer diameter of the cable.
No joints or splices shall be accepted on main feeders.
Each wire shall be labeled at both termination points. Individual conductor or circuit identification shall be carried throughhout with circuit numbers or other identification clearly stamped on terminal boards and printed on directory cards in distribution cabinets and panel board.
In junction boxes, cabinets, and terminal boxes where the total number of control, indicating, and metering wires is three or fewer and no terminal board is provided, each wire including all power wires, shall be properly identified by means of a plastic- coated, self-adhesive wire marker.
Wires including motor loads and other power wires too large for connection to the terminal boards shall be identified by wire markers as specified above.
In manholes, in pull boxes, in junction boxes, and at both terminals, each wire and cable shall be properly identified by a laminated plastic tag located so as to be easily seen. Wires and cables shall be identified by cable number.
Wires and Cables shall be similar to "LIBAN-CABLES" or approved equal.
Cable trays shall be similar to “Tolartois” or approved equal.
GN ELEC /23 EL QAA RECREATIONAL SPACES UNDP
ELECTRICAL SPECIFICATIONS
PART 6 - Electric Devices
All electric devices shall comply with NFC - 63.
The Contractor shall supply and install all of the electric devices as required and as herein specified.
Electric devices shall be flush mounted type, unless otherwise required and shall be installed at heights as directed by the Engineer.
Electric devices fixed on glazed tiles such as in bathrooms or kitchens shall include a rubber gasket between the cover plate and the glazed tiles for rigid fixing of the device plates. The gaskets shall not protrude beyond the plate and they shall be neatly cut in the shape of the plate.
Plates shall be rectangular or square in shape to the approval of the Engineer.
Plates shall be designed to match associated devices.
Plates for cord extension shall be provided with cord-grip bushings, threaded type, of same material and finish as of plate.
Plates for electrical devices shall be made of a colour, to the approval of the Engineer.
Plates shall be furnished with supports and shall be integrad with each other.
Fixing screws shall be chromium plated and polished. Screw heads shall be finished to suit plate.
Switches shall be mounted with the operating handle in upward position when in the "ON" position, unless otherwise directed by the Engineer. Switches shall interrupt the live wire or hot and neutral simultaneously as applicable.
Switches shall be quick-make, quick-break, with silver alloy contact, rocker-operated with quick operating mechanism, 250 V rated.
Lighting switches shall be 10 amp, unless otherwise required, fully rated to carry inductive load.
GN ELEC /24 EL QAA RECREATIONAL SPACES UNDP
ELECTRICAL SPECIFICATIONS
Lighting switches shall be to the approval of the Engineer.
Indicator pilot lights of lighting switches shall be to the approval of the Engineer.
10 amp lighting switch shall be similar to LEGRAND 76010 or approved equal.
Fused connection units shall be of the rating as indicated on the drawing. They shall be similar to ARNOULD 2554726 or approved equal.
Socket outlets shall be mounted with correct polarity such that phase, neutral and earth conductors are connected according to manufacturer's markings.
Socket outlet shall be of the standard 3-pin single phase type of molded plastic unless otherwise specified, of a minimum rating of 16 amps.
Sockets shall be of the shuttered type such that holes are blanked off by a screen which is released by the pressure from the plug insert.
In kitchen and similar damps locations, no socket outlet shall be mounted within 60 cms of any tap, sink or basin.
Socket outlets surface mounted shall be similar to LEGRAND MOSAIC 45 or approved equal.
Ceiling roses shall be designed to meet the requirements for the installation of flexible pendant cords. They shall be molded in a non-track insulating material.
Ceiling roses shall incorporate 3 terminals (one of which properly shrouded), loop-in, earth and strain. The shrouded terminal shall be used for the live wires.
Ceiling roses shall be to the approval of the Engineer.
All lighting fixtures incorporated in a false ceiling shall be connected to the ceiling lighting outlet through a ceiling rose and a flexible cord.
Ceiling roses shall be similar to LEGRAND 60192 or approved equal.
GN ELEC /25 EL QAA RECREATIONAL SPACES UNDP
ELECTRICAL SPECIFICATIONS
Switch panels shall be of the grid witch system comprising rocker-operated grid switches and cover plates of molded material unless otherwise required.
Switch panels shall comprise 10 amp lighting switches, and other units if so required.
Switches shall be to the approval of the Engineer.
Switch panel shall have the words "Danger 380 volts" engraved in it.
Cover plates shall be to the approval of the Engineer.
Stations shall incorporate two push-button stations which shall be momentary contact type devices: one for stop, colored red, and one for start, colored green.
Push-button stations shall be molded from trac-resistant material, and shall be provided with button shrouding ring.
A pilot light shall be incorporated with a green polycarbonate lens which shall light when the "Start" is actuated. Legend plates shall be incorporated with the inscriptions "ON" fot the pilot light, "START" for the start button and "STOP" for the stop button.
Pushbutton stations shall be recess mounting type provided with an enameled heavy gauge steel box. The cover shall be fully gasketed and fixed by chromium plated retaining screws.
Cable outlet shall comprise a molded cover plate with a bottom groove for multicore flexible cord, a cable clamp, 3 terminals for conductors.
Cable outlets shall be to the approval of the Engineer.
Cable outlets shall be similar to LEGRAND 76187 or approved equal.
Lighting Contactors shall switch a load at 220/380 volts, and shall have 3 poles, unless otherwise indicated.
GN ELEC /26 EL QAA RECREATIONAL SPACES UNDP
ELECTRICAL SPECIFICATIONS
Lighting Contactors shall be suitable for continuous duty with all type of lighting loads. Lighting contactors shall have totally enclosed silver alloy double break power contacts, capable of making and breaking any load within the rating of the contactor without the assistance of auxiliary arcing contacts. Auxiliary arcing contacts are not acceptable. All contacts must be removable without disturbing link or load wiring.
All contactors shall be industrial duty and rated 600 volts even though they may be used for commercial duty and/or at a lower voltage.
Switches shall be non-fusible single throw, rated as required by the Engineer and as shown on drawings.
Switches shall be capable of making, carrying and interrupting specified current and designed for operating on specified voltages.
Switches shall incorporate full size neutral solid links.
If starter control circuit of equipment is energized by an auxiliary supply such as control wires, other than the main power circuit of the motor, the corresponding disconnecting switch shall include auxiliary contacts to isolate such auxiliary supply.
Where used for motor, the switch shall have horsepower motors at least equal to the motor horsepower ratings, and shall interrupt safely stalling current.
Switches shall be supplied and installed in general purpose enclosures, when used indoors, and in weather-proof enclosures, where so indicated, or used outdoors.
Enclosures shall be treated with a rust-inhibiting phosphate, and finished in baked enamel.
GN ELEC /27