I'm going to wire a detached garage and grounding the panel in the
garage is subject to much confusion to me with respect to the 2002
NEC. The detached garage will also have telephone and coax cable
coming from the house.
I was planning on running a 2/2/2/6 feeder cable from the main 200 amp
panel at the house to a 100 amp subpanel with main breaker at the
detached garage. Subpanel would have a floating neutral and separate
ground bus. Also would sink a ground ground rod at the garage and
connect it to the ground bus of the subpanel.
After researching this forum this appears the safest method to wire
the garage panel.
The local permit office says I only need a 3 wire feeder, bond the
neutral and ground at the garage panel, and sink a ground rod and
connect to panel at the garage, In other words, he said this was just
like another service panel since the garage is detached. I don't need
a fourth ground wire from the main panel. He said the telephone/coax
wire isn't an issue.
Sorry for the long explanation, but do I have a potential safety issue
here if I go with the permit office advice and use 3 wire for the
What if I use 4-wire for the feeder? It would be contrary to what the
permit office said. It meets NEC code, so technically it would pass