Posted by paul on February 19, 2010 at 11:17:02 from (66.44.132.155):
In Reply to: Electrical Grounding posted by John T on February 19, 2010 at 10:31:46:
I have the typical farm setup, 3 wires coming from the main disconnect/meter running to various buildings. Each building is considered it's own main, with groundrod. This was proffesionally installed about 2007 or so. Long runs of 200 amp wire 300-400 feet, not cheap wire.
Just put up a new building, and realize, to extend off of this system - will code allow me to continue this 3 wire setup, or do I need to start at the meter with a 4 wire now? Amounts to 500+ feet of wire to go to the meter plus routing it around exsisting stuff. Or just taping off the 3-wire box positioned about 120 feet away & in the clear.
I thought the 3-wire deal was allowed for ag buildings yet, but who knows?
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