Re: Help, I need a electrician!

Posted by John T on February 01, 2010 at 05:53:17 from (71.55.31.109):

In Reply to: Help, I need a electrician! posted by Mark Warden on February 01, 2010 at 05:06:50:

Mark, let me get your questions first:

Where would I be getting voltage back through this wire?

That equipment ground condutor is running closely in paralell with the hot phase conductor and as such its possible to impart a voltage on the equipment ground conductor slightly higher then mother earth potential. Back at the service entrance the Neutral is bonded to mother earth via the grounding electrode conductor (big No 4 bare copper wire) to earth via a grounding electrode (big copper rod driven into earth) and the Equipment Ground Buss is bonded to the Neutral Buss, and absent the long paralell conductor runs the equipment ground is pretty well at earth potential there UNLIKE out at the barn

I disconnect it and the waterer is fine no stray voltage?

Thats because your no longer raising the waterer to that higher then earth potential

OR ELSE THERES A MINOR (high resistance) SHORT SOMEWHERE

I dont have the NEC handy (down in Florida for the winter) but as I recall theres an NEC exception FOR REMOTE BUILDINGS USED TO HOUSE LIVESTOCK that allows you to drive an extra mother earth ground rod and bond the waterers metal frame to that which takes it back down to earth potential so old Bossy isnt shocked when she drinks from the fountain

Hopefully others can add to this and even quote the NEC exception to address and correct this "shocking" condition

John T

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