bids are invited for 415v power distribution board indoor type 3 phase 4 wire, 415v + / - 10%, 50hz + / - 5%, short time rating 50ka for 1 sec, complete with 2 nos. 250a mccbs for incomers, 1 no. 250a mccb for buscoupler, and 10 nos. outgoing feeders having 4 nos. 100a mccbs, 3 nos. 63a mccbs & 3 nos. 32 a mccbs. detailed specification mccb: 250a tp+n ( 3 pol e + neutral link ) 50ka with overcurrent, short circuit protection, operating handle mechanism, on / off indication lamp. panel should be complete with analog ammeter & voltmeter with selector switch for incomers only. material of construction-crca sheet steel, thick ness of material-2mm for all load bearing members including gland plates and 1.6mm for non load bearing section like partitions, doo rs etc. with necessary stiffeners as required, support-free standing, self supported, floor mounting, single front, compartmented, p rovision for lifting arrangement, cable entry-bottom with undrilled detachable gland plate & separate cable alley. cable termination chamber shall be fully separated from live busbars, cable terminals shall have full rating of mccb. space heaters to be provided, 50x6 mm gi earth strip, neutral solidly grounded, paint: green of shade 221 of is-5, system , phase & neutr al busbar-tp / tpn aluminum electrolytic grade busbar shall be provided, with dmc / frp busbar supports & fully insulated with heat sh rinkable sleeve.enclosure protection: ip54, compartmentised design, minimum clearance ph-ph:25mm, ph-e: 19mm, power wiring will be with 1.1 kv grade pvc multistrand copper flexible cable. pdb shall conform to is 8623 part 1-3:1993 ( q3 ) total quantity : 2