You say this is to be run from the main to the new panel? I thought feeders always needed a ground wire, that the conduit was not sufficient. Am I wrong here?
As far as branch circuits are concerned, it was oce exlained to me that the connections on conduit just might have little sparks, wherever a connection might not be perfect- and that this would create some "noise" that sensitive electronics (such as found in a recording studio) might pick up. If there is a wire run in addition to the conduit, this issue is prevented, as the wire is a much better conductor than the pipe.
True? I don't know. The guy who was so anal about having a ground wire also had some pretty basic errors in his wiring.
