I have been retired for a while and am not up on the current codes but 6 or 7 years ago we could use a ground rod at a sub panel as long as there was no other conductor running between the building containing the main service and the outbuilding that could act as a ground fault path. In other words if there was a metal gas pipe, metal water pipe, metal conduit, or according to our local state inspector even a telephone line, you had to pull a 4th conductor for a ground fault conductor. In the 2002 code that was spelled out in the code section 250:32
Whether you use a ground rod or a 4th conductor as a grounding conductor (NEC calls this the Equipment Grounding Conductor) the ground and the neutral (NEC calls this the grounded conductor) have to be isolated in the subpanel.
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Today's Featured Article - Memories of an IH Super A When I was ? up to 10, I worked on my Papaw's farm in Greeneville, TN every summer. As I grew older (7), it was the thrill of my day to ride or drive on the tractor. My Papaw had a 1954 IH Super A that he bought to replace a Cub. My Papaw raised "baccer" (tobacco) and corn with the Super A, but the fondest memory was of the sawmill. He owned a small sawmill for sawing "baccer" sticks. The Super A was the powerplant. When I was old enough (7 or 8), I would get up early and be dressed to
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