Accidently pinch off a sealtite cable containing a 480 volt branch circuit and what happens? It tripped the 15amp breaker protecting this circuit but it also tripped the 400amp breaker protecting the feeder to the panel containing the 15 amp breaker. Is this normally what would occur in a direct line to line to ground fault such as this? I did not check the AIC ratings on the breakers. Could the breakers having two different ratings have caused the 400 amp to trip? Or is anything to be expected in a situation like this?
