iggy2
Senior Member
- Location
- NEw England
I have a project where there is a 2,000 ampere switchboard, with bolted pressure main switch, and seven 400A fused switches. It's a large, floor-mounted board, stuffed in a basement, with limited access, inadequate working space (22") and rusting out. The peak demand over the last 12 months was 384 amperes. I don't think a replacement 2,000 ampere switchboard would even fit through the access door, and then drop down into this basement space.
I would like to 'split' the service into (2) 1,000 ampere, wall-mounted panelboards, and serve 1/2 the loads from each panelboard. The incoming service lateral is 6 sets of something (probably 500 kcmils) from a pad mount transformer, so I would take three sets and run to each panelboard. There would be two main disconnects, allowed per 230.71, and they would be grouped per 230.72
See any issues with this approach? Would this make it "two services", in violation of 230.2? (I can and will ask for special permission if so - 230.2(C)(3).) Any other issues?
If this approach flies, what about then reducing from (2) 1,000 A panelboards to (2) 800 ampere? or (2) 600 ampere? The demand certainly does not warrant 2,000 amperes, but we have not calc'd the load per 230.79 as we don't have all the loads.
Thanks.
I would like to 'split' the service into (2) 1,000 ampere, wall-mounted panelboards, and serve 1/2 the loads from each panelboard. The incoming service lateral is 6 sets of something (probably 500 kcmils) from a pad mount transformer, so I would take three sets and run to each panelboard. There would be two main disconnects, allowed per 230.71, and they would be grouped per 230.72
See any issues with this approach? Would this make it "two services", in violation of 230.2? (I can and will ask for special permission if so - 230.2(C)(3).) Any other issues?
If this approach flies, what about then reducing from (2) 1,000 A panelboards to (2) 800 ampere? or (2) 600 ampere? The demand certainly does not warrant 2,000 amperes, but we have not calc'd the load per 230.79 as we don't have all the loads.
Thanks.
