I recently had my main service professionally upgraded to 200A and had a 60A subpanel installed in my master suite to support future additions. All work passed city inspection, for whatever that's worth. I'm just now noticing some things about the work that I'm not so sure about.
The main panel is in an separate-attached garage. The majority of circuits enter the house through a covered breezeway between the garage and house. The new 60A subpanel in the master suite is fed by wires in a buried conduit run through the backyard from the garage.
Only one ground rod was driven for the 200A panel. Is this sufficient?
There are only 3 conductors between the main and sub. 2 hot and 1 neutral, no separate ground. There is a ground bar installed in the panel, but no wires connect to it. When I asked the electrician about this after the fact, he said that the neutral wire also serves as the ground, and that it is ok to do this in a subpanel. Is he correct? I've read that ground and neutral bars should not be bonded in a subpanel, but in this case there isn't even a ground wire - neutral and ground share the same wire.