Posted by John T on June 10, 2014 at 15:16:46 from (216.249.72.121):
In Reply to: Re: Wiring a Shop posted by Jiles on June 10, 2014 at 14:47:55:
No problem Jiles, your good questions show youre trying to learn and do it right.
QUESTION "I have no problem with running the fourth wire, but what would be the purpose if it is connected to the same buss in the main home panel?"
MY PROFESSIONAL OPINION No warranty it may be right or wrong and Im not saying its either, feel free to take it or leave it as you choose
The Equipment GroundING Conductor is designed to carry ONLY Fault Current, NEVER normal Neutral return current. That's why its a dedicated and isolated conductor soley to return fault current.
The Neutral is a Grounded yet live current carrying conductor and you see its insulated and I bet you would walk up to it and peel off the insulation and touch it when the appliance is on cuz you may be placing your old ticker in a parallel path with a live current carrier.
The Equipment GroundING conductor is carried out to the sub and is ONLY there to conduct fault current and that's why at the sub its NOT tied to the Neutral. The Neutral is for carrying all the normal return current AND THE TWO SHOULD NOT BE MIXED AND MATCHED AND SUBSTITUTED otherwise the ground may be carrying return current (ONLY supposed to carry fault current).
The equipment GroundiNG Conductor is often wired to the outer conductive metallic case of a tool or appliance and you touch that. Would you want to touch the insulated Neutral that's hot and carrying current??? NOOOOOOOO but if you mix n match and sub one for the other that can happen. Also the wrong set of accidental shorts or opens could end up energizing the case of a tool if Neutrals and Grounds are mixed n matched.
Neutral is insulated and carries return current Ground is bare and may be wired to a tool case so do not mix n match and substitute one for the other.
When you run 4 wires out to a sub the Neutral carries ONLY normal return current while Ground is dedicated to carry ONLY fault current.
Nuff for now were headed to Square Dance Lessons where each year we teach the new students, I will check back tomorrow if more questions
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