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Ravens53
New Member

USA
5 Posts
Posted - 02/04/2010 :  10:56:34  Show Profile  Visit Ravens53's Homepage  Reply with Quote
I am feeding a 225 amp RPP in a data center. I submitted my pricing to the facility manager. I told him I am using 3# 4/0 THHN phase conductors a #4/0 neutral and #2 ground. He told me I am using to large of wire as all his others are 3/0 THHN. I told him that the breaker had 75 degree C lugs and it was not legal to use 3/0. I am wrong as I am doubting my knowledge? If I am wrong why?

rabbitgun
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USA
2035 Posts
Posted - 02/04/2010 :  11:29:54  Show Profile  Visit rabbitgun's Homepage  Reply with Quote
If it was 200a 3/0 would work but I say you are right and need 4/0 if it is 225a as you state.
An analog man in a digital world.
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rewire
Member

45 Posts
Posted - 02/05/2010 :  14:42:23  Show Profile  Visit rewire's Homepage  Reply with Quote
Why the #2 ground? If your OCD is 225 then #4 would be compliant.




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rabbitgun
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USA
2035 Posts
Posted - 02/05/2010 :  16:03:34  Show Profile  Visit rabbitgun's Homepage  Reply with Quote
quote:
Originally posted by rewire

Why the #2 ground? If your OCD is 225 then #4 would be compliant.




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Hmmmmm good point rewire.
An analog man in a digital world.
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