DELHI TRANSCO LIMITED

20.13 The Contractor shall furnish all wire, conduits and terminals for the necessaryinter-phase electrical connections (where applicable) as well as between phasesand common terminal boxes or control cabinets.20.14 All input and output terminals of each control cubicle shall be tested for surgewithstand capability in accordance with the relevant IEC Publications, in bothlongitudinal and transverse modes. The Contractor shall also provide all necessaryfiltering, surge protection, interface relays and any other measures necessary toachieve an impulse withstand level at the cable interfaces of the equipment21.0 Lamps and Sockets21.1 LampsAll incandescent lamps shall use a socket base as per IS-1258, except in the caseof signal lamps.21.2 SocketsAll sockets (convenience outlets) shall be suitable to accept both 5 Amp & 15Amp pin round Standard Indian plugs. They shall be switched sockets withshutters.21.3 Hand LampA 240 Volts, single Phase, 50 Hz AC plug point shall be provided in the interiorof each cubicle with ON-OFF Switch for connection of hand lamps.21.4 Switches and Fuses21.4.1 Each panel shall be provided with necessary arrangements for receiving,distributing, isolating and fusing of DC and AC supplies for various control,signalling, lighting and space heater circuits. The incoming and sub-circuits shallbe separately provided with switch-fuse units. Selection of the main and Subcircuitfuse ratings shall be such as to ensure selective clearance of sub-circuitfaults. Potential circuits for relaying and metering shall be protected by HRCfuses.21.4.2 All fuses shall be of HRC cartridge type conforming to IS:9228 mounted on plugintype fuse bases. Miniature circuit breakers with thermal protection and alarmcontacts will also be accepted. All accessible live connection to fuse bases shall_____________________________________________________________________T.No. DTL/DGM(T)SSC-II/GPL/09-10/GIS/GT-02Page 282 of 566