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Re: O/T Electric wireing
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Posted by John T on March 29, 2006 at 10:45:26 from (66.244.90.98):
In Reply to: O/T Electric wireing posted by 37 chief on March 29, 2006 at 08:49:40:
Chief, its NOT safe or NEC Code permissible to use that 240 volt 3 conductor (L1, L2, Equipment Ground) circuit to feed a 120 volt circuit, even though it would indeed measure 120 from either hot leg to that safety bare/green equipment grounding conductor. Like the other gents told ya, you need to run a hot and a Neutral (a white grounded conductor) plus a safety equipment ground (green/bare grounding conductor) to serve a 120 volt 1 phase 3 wire circuit. To have either 120 or 240 volt NEC code proper circuits, you need to run 4 wires: 2 hots, Neutral (white grounded conductor), Equipment Ground (green/bare grounding conductor) ALSO in the event you want to set up a sub panel in a garage fed from say the main panel in the house, you need to run the 4 wires PLUS at the sub panel the Neutral Buss and the Ground Buss MUST BE SEPERATE AND ISOLATED unlike at the main service where they are bonded together and also bonded to a grounding electrode (such as a made ground like a driven ground rod). The safety equipment ground (grounding conductor) is used ONLY to provide a low impedance circuit path for fault current back to the main panel to clear the fault by tripping a breaker. The Neutral (grounded conductor) is used to carry the normal return current to operate the load. John T Nordhoff, retired EE in Indiana
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