INDOOR TRANSFORMER SWGR UNIT;12KV;2000A 25KA;2000A BUS;METAL ENCLOSED SWGR & CONTROL GEAR ASSEMBLY; C/W 110V DC AUX SUPPLY, CURRENT TRANSFORMERS FOR TRANSFORMER AND BUS PROTECTION SCHEMES & METERING & WITHDRAWABLE THREE PHASE VOLTAGE TRANSFORMER COMPRISING OF THREE SINGLE PHASE UNITS, CAPABLE OF BEING CONNECTED TO THE BUS (PREFERRED) OR ALTERNATIVELY TO THE CABLE COMPARTMENT;