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 - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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