|
|
|
0 members (),
8
guests, and
15
robots. |
|
Key:
Admin,
Global Mod,
Mod
|
|
|
|
Joined: Oct 2002
Posts: 830
OP
Member
|
According to the wire table 310-16 ( 99 Code Book, I don't have my new book with me) # 8 wire is good for 50 amps in the 75 degree column, and I know this is good only if the terminals are rated 75 degrees, which they are. Does
8/3 with ground romex qualify for this rating also? I had an inspector tell me once that it didn't, but I can't find where he would have got that from unless it was in an old code at the time. Thanks, Steve...
|
|
|
|
|
Joined: Dec 2003
Posts: 751
Member
|
He is maybe refering to 334.80, which limits the ampacity of NM cables to that of the 60 degree column.
Earl
|
|
|
|
|
Joined: Jul 2004
Posts: 9,663 Likes: 4
Member
|
Yup that is what he is talking about and you can't get away with the "round up" trick you can with #6 since 40 is a standard breaker size. Even if you decide to go for SE/SER you still can't use the 75c column because of 338.10(B)(4)
Greg Fretwell
|
|
|
|
|
Joined: Nov 2007
Posts: 763
Member
|
Hi Greg, I could be wrong, but I thought 338.10(B)4 excluded 334.80 Ampacity. 
|
|
|
|
|
Joined: Jul 2004
Posts: 9,663 Likes: 4
Member
|
You are right. I should try to read a little better before I speak. My original thought was that it was OK, then I looked it up. 
Greg Fretwell
|
|
|
|
Posts: 57
Joined: August 2003
|
|
|
|
|
|
