ECN Forum Forums General Topics of the Trade General Discussion Area What changed, the wire or the breaker?

master66,
In a 3 phase 120/240 volt delta system, the grounded conductor is not current carrying and no derating would be required. If the system is 120/240 volt delta, I stand by the answer I posed on June 8. If the system was 208/120 wye, derating may be required if there is a lot of nonlinear loads.
Don