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Country Talk Discussion Board

Re: 3 wire verses 4 wire [question for jimbob]


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Posted by Willy-N on March 03, 2003 at 15:18:28 from (216.64.163.125):

In Reply to: 3 wire verses 4 wire [question for jimbob] posted by fredo on March 03, 2003 at 13:01:34:

What a 4 wire system is 2 hots, 1 Isolated Neutral and a ground. The Isolated Neutral is just that isolated from the ground in the panel. No grounds hooked into the neutral bar. When you wire in barns where Cows are you are supposed to use a insulated ground wire not regular romex. This way there is less chance of stray voltage getting into the wire on the way to the device being grounded by it. The neutral and Ground will come together only back at the service meter area and then the whole system is all bonded together as one. Haveing a good ground potential will drain off the the stray voltage in the metal stuff in the barn and it you lose the neutral you won't heat up all the things conected to it and shock the cows as long as the ground is still good. You need to read about grounding and bonding it would take pages and pages of typing to explane all the different ways and reasons for it in barns and this is why electricians go to school for 4 years to learn it. Even then there are lots of them who do not understand it too!!! Mark H.


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