Re: O/T Electric wireing

Posted by John T on March 29, 2006 at 14:26:04 from (66.244.90.98):

In Reply to: O/T Electric wireing posted by VADAVE on March 29, 2006 at 11:30:17:

Dave, that wiring method is as old as my mother in law and hasnt been NEC code legal for yearsssssssssssss. The proper NEC and state of the art and trade name/reference for modern house wiring is 120/240 Volt, Single Phase, 3 wire. It is an earth grounded system NOT a floating service. At the service transformer the Neutral is earth grounded (also grounded on high voltage primary side if a Y service) then again at the service entrance. ONLY at the main service entrance are the Neutral and Ground Busses bonded together (NOT at sub panels) and the Neutral is bonded to a grounding electrode which leads to the earth ground reference like a made ground such as a driven ground rod.

Nowwwww 3 phase can be either Wye (which is usually earth grounded) or Delta (which is usually floated although I have corner grounded them).

A 3 Phase 4 Wire Wye circuit carries 3 hots, a Neutral, and an equipment ground. At the service entrance the Neutral and Ground busses are bonded, same as in the 1 Phase 3 Wire home system. Typical of voltages are 208 Y 120 or 480 Y 277.

A 3 Phase 3 Wire floating Delta circuit carries 3 hots and an equipment ground (has no Neutral). Typical of voltages are 240 or 480. There can also be a hot or high leg 120/240 volt 3 phase 4 wire Delta configuration in which one transformer has a center Neutral which is earth grounded and off that transformer one gets 120 volt single phase (2 legs) or 240 volt single phase.

Hope this helps yall

John T (retired electrical engineer who designed secondary power distribution systems)

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