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 - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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