Need advice, I have not done this type of upgrade before. Customer is having an addition to home. Current loadcenter is is 100 amp, does not have enough available circuits. 150 Amp panel would be sufficient for finished dwelling. The utility service drop is overhead to a customer-owned pole. Meter socket and a enclosure mounted 150A 2 Pole OCPD mounted on pole feeding rigid conduit (3 conductors) running underground (100') to a 2 pole fused disconnect in the basement. Then from the disco to existing breaker panel.
Does the NEC require 3 conds. & a grounded conductor from pole mounted OCPD to disco in basement? I think existing underground conductors are sized properly for 150 amp but I'm thinking that there aren't enough of 'em.
I'm visiting site tomorrow to fill in missing details.
Don
