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Old 11-10-2010, 03:08 PM   #1
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100 amp service conduit size


My city is on NEC 2008.
I just had a 60amp panel replaced with a 100 amp breakers.
The electrician did not replace the 1" conduit.
He claims this is allowed by NEC.
If memory servs me correct he used #2 aluminum.

I thought 100 amp SEC required 1-1/4 conduit minimum.

Who is correct here?
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Old 11-10-2010, 04:52 PM   #2
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So you have (3) #2 alum going thru 1" conduit ?
PVC conduit or ?
Fill calc I found seems to indicate that 1" is the min allowed
But not 100% sure



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Old 11-10-2010, 04:57 PM   #3
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at least 1 1/4,but 1 1/2 better.over fill with 1"

Last edited by oleguy74; 11-10-2010 at 05:04 PM.
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Old 11-10-2010, 06:08 PM   #4
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According to table C.10 in chapter 9 of the Code, one can install up to (3) #2 type XHHW conductors in a 1" PVC schedule 40 conduit.

Same allowable for installation in a 1" rigid metal conduit (table C.8(A).

However, table C.9(A) for schedule 80 PVC only allows two such conductors.

DO you know which type of conduit was used here?
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Old 11-10-2010, 06:23 PM   #5
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yep...read for #1xhhw.
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Old 11-10-2010, 10:16 PM   #6
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It's a metal conduit.
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