My problem is a 24 unit co-op building that was renovated in the late 1970s. It has three phase, 4 wire, electrical service conductors that feed a 400 Ampere 3 pole fused switch which supplies the apartments and the public areas. I am trying to work backwards from the 400 amp electrical switch...

I'm bidding on a multi-building apartment complex where there are two kinds of buildings: - Building 1: occupancy type R-2, construction type 5-B (all apartments) - Building 2: occupancy type A-3, B and R-2, construction type 5-B (community center, main office, and apartments) Are there any...