New Code Regarding Wire Size For A Load.

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GARUMACHIK

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Dose The New Code Reconise The Wire Amperage For The Lug On A Breaker Or The Load On The Breaker? That Is We Use To Size A 400a Feeder To Be # 500 Mcm Thhn Now The Inspectors Are Saying That The Wire Size Has To Be 75 Digree And You Must Use #600mcm Thhn. For A Load Of 300a On A 400a Cb.
 
Take a look at 240.4(B), 500 Kcmil CU can be protected by a 400 amp breaker but the load can not exceed the 75 C limit in 310.16
 
GARUMACHIK said:
Dose The New Code Reconise The Wire Amperage For The Lug On A Breaker Or The Load On The Breaker? That Is We Use To Size A 400a Feeder To Be # 500 Mcm Thhn Now The Inspectors Are Saying That The Wire Size Has To Be 75 Digree And You Must Use #600mcm Thhn. For A Load Of 300a On A 400a Cb.
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How the heck did you get Caps on every word like that? Did you write your question in MSWord using Title caps and copy/paste it here? Just curious, I've never seen that in a forum before.
 
Jraef said:
How the heck did you get Caps on every word like that? Did you write your question in MSWord using Title caps and copy/paste it here? Just curious, I've never seen that in a forum before.
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i wOULD aLSO lIKE tO kNOW hOW hE dOES tHAT??

sTEVE
 
Is this right then?

Is this right then?

Sooo, let me get this staight. In theory I could install 2 sets of 250kcmil copper, and fuse them @600amps as long as the total load is less than 510 amps?
 
POWER_PIG said:
Sooo, let me get this staight. In theory I could install 2 sets of 250kcmil copper, and fuse them @600amps as long as the total load is less than 510 amps?
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You got it, and that was a good example being just 10 amps over 500.
 
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