GAIL (India) Limited

5TECHNICAL SPECIFICATIONS1. Scope:CHAPTER 1INTERNAL WIR1NGThis specification is intended to cover the requirements of supply, installation testing and commissioningof electrical wiring installation and other accessories required for its satisfactory operation This covers theessential requirements or precautions regarding wiring installations for ensuring satisfactory and reliableservice.2. Standards:The Electrical wiring installations and other accessories shall comply with latest IS - 732 -1989 andNational Electrical code - 1985.3 ConstructionWall mounted lighting switch boards shall be installed such that the bottom is at a minimum height of1.35 m above finished floor level wherever applicable, as indicated in the drawing.Equipment which is on the front of a switchboard shall be so arranged that inadvertent personnel contactwith live parts is unlikely during the manipulation of switches, changing of fuses or similar operation.In every case in which MCBs are fitted on the same pole, these MCBs shall be so arranged that the MCBsare not live when their respective switches are in ‘OFF’ position.No MCBs other than MCBs in instrument circuit shall be fixed on the back or behind a switchboard panelor frame.4. Capacity of circuitLighting Circuits shall not have more than a total of ten points of fans, 5A socket outlets and light pointsand its total load shall not exceed 800 watts. Lights, fans, and 5A socket outlets can be wired on a singlecommon circuit. If fan circuit is drawn separately, circuit shall not be used more than eight points andload shall not exceed more than 800 watts. In the circuit, the neutral and earth wires can be looped up to l0points (.) From distribution boards Neutral & Earth wires shall be run for every circuit.The power circuits shall not have more than two outlets per circuit if load to he fed by each outlet is lessthan 1 KW and if load is more than 2 KW each outlet shall be connected to a separate circuit.NOTE : ALL SWITCHES/ SOCKETS ETC. SHALL BE MODULAR TYPE IRRESPECTIVE OFDESCRIPTION IN THIS SPECIFICATIONSSwitches: All switches shall be placed in the live conductor of the circuit and no single pole switch or fuseshall be inserted in the earth or earthed neutral conductor of the circuits. Single pole switches(other than for multiple control carrying not more than 15 amperes may be of the piano flushtype and the switch shall be ‘ON’ when the knob is down.Lamp holders:Lamp holders for use on brackets and the like shall have not less than 1.3 cm nipple and all thosefor use with flexible pendant shall be provided with cord grips. All lamp holders shall beprovided with shade carriers Where center contact Edison screw lamp holders are used, the outeror screw contact shall be connected to the ‘middle wire’ or the neutral or to the earthed conductorof the circuit.Lamps: All incandescent lamps, unless otherwise specified shall be hung at a height of not less than 2.5 m abovethe finished floor level.