Posted by buickanddeere on January 08, 2013 at 09:51:23 from (184.151.61.237):
In Reply to: OT 110 from 220 posted by old on January 08, 2013 at 08:38:07:
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That is why the proper supply out to a remote panel is four wires and float the neutral bar.Problem we are stuck with a hang over from the early 1900's with a three wire overhead triplex supply.
The proper connection at a remote panel supplied with a triplex. Is a floating neutral bar connected to earth through a tingle voltage filter. Or if legal, float the neutral and run a proven working ground system with no neutral to earth bond.
The only reason neutral has a connection to earth is to keep the neutral at earth potential. And limit line touch voltage to a max of 120,240,277 or 600.
The ground bond to neutral which is only supposed to occur at the transformer and at the first panel depending. This is to limit the possible shock to earth to less than 120,240,277 or 347 V. Incase the service transformer fails .
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