ECN Forum Forums General Topics of the Trade General Discussion Area Circuit breakers and load calculations

Clyde:
Math 40 circuit panel....20 amp, 1 pole cb's
800 amps; divide by 2 hot legs (resi)= 400 amp max connected load. BUT, the 200 amp main would trip.

Load calcs are in the NEC

Theory is you can have an unlimited quantity of "sub-panels", the limitations are the OCP of the main, and the OCP of the feeders.

John