Do you isolate the neutral bar from the ground in a pony panel in a detached garage?
Yes, you isolate the neutral bar from the ground in a pony panel. The only place the neutral is bonded to ground is at the main service.
Yes, absolutely you must isolate the neutral bar from the ground in a "sub panel".
Yes of course, nutreal but in sub panel must be insulated from ground.
Only one connection between the ground system and the neutral system, and that is at the first service disconnect. This is vital for the proper operation of overcurrent protection devices.
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