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Does NEC allow two or more wires in the same neutral or ground buss hole? Or do I have to put one wire per hole? Thanks.

NEC 250.50 says a service panel should be grounded to a metal/copper water pipe. In my case, PEX was installed between the water meter and house. Four inches of copper pipe is exposed on both sides of the foundation wall. PEX is used in the house. Am I getting a sufficient ground for the...

Does URD cable need to be in conduit from the LB to the subpanel inside the garage?

Building new detached garage and needed a 100A subpanel. The subpanel is being feed from the house’s 200A service panel with 100A breaker for the subpanel feeder wire. The electrician was going to install a 100A Square D panel with 20 breakers spaces. I told him I needed more breakers. He...

The electrician ran a 2-2-4 URD feeder to my detached garage 100A subpanel. After reading several posting on this site, I realized it's wrong and needs to be brought up to latest NEC. So now the electrician wants to bury a #4 ground wire between the house and garage. I’m assuming it's...