nanog mailing list archives
Re: L6-20P -> L6-30R
From: Seth Mattinen <sethm () rollernet us>
Date: Wed, 19 Mar 2014 14:51:54 -0700
On 3/19/14, 10:21, Jay Ashworth wrote:
It is exactly that: no one says you*can't* wire a 20A branch circuit with #10. It is even*possible*, though unlikely, that if you did so, you wouldn't have to derate it to 80%. I would have to reread the Code to be sure.
Well, I'd say it's pretty likely. However highly unlikely to be code-worthy of slapping on a 30A breaker in place of a 20. 10-20 CCCs in a raceway or cable is a 50% derating, so if those conductors were for 20A branch circuits it would have to be 10AWG, not 12 since with 10AWG you're derating from 40A. But the max protective device on 10AWG is 30A unless permitted by 240.4.
Even 7-9 CCCs in a raceway or cable derates 10AWG to 28A (70%), so while still suitable for a 20A breaker it's not for 30A. Max would be 6 CCCs to stay at 80% derating (4-6 CCCs).
~Seth
Current thread:
- Re: L6-20P -> L6-30R, (continued)
- Re: L6-20P -> L6-30R Andrei Ivanov (Mar 18)
- RE: L6-20P -> L6-30R David Hubbard (Mar 18)
- Re: L6-20P -> L6-30R Chuck Anderson (Mar 19)
- Re: L6-20P -> L6-30R Justin M. Streiner (Mar 18)
- Re: L6-20P -> L6-30R Jay Ashworth (Mar 18)
- Re: L6-20P -> L6-30R Randy (Mar 18)
- Re: L6-20P -> L6-30R Jeremy Bresley (Mar 18)
- RE: L6-20P -> L6-30R Staudinger, Malcolm (Mar 19)
- Re: L6-20P -> L6-30R Joel Maslak (Mar 19)
- Re: L6-20P -> L6-30R Jay Ashworth (Mar 19)
- Re: L6-20P -> L6-30R Seth Mattinen (Mar 19)
- Re: L6-20P -> L6-30R Jay Ashworth (Mar 19)
- Re: L6-20P -> L6-30R Rob Seastrom (Mar 19)
- Re: L6-20P -> L6-30R Lamar Owen (Mar 20)
- Re: L6-20P -> L6-30R Rob Seastrom (Mar 20)
- Re: L6-20P -> L6-30R Gary Buhrmaster (Mar 20)
- Re: L6-20P -> L6-30R Lamar Owen (Mar 20)
- Re: L6-20P -> L6-30R Gary Buhrmaster (Mar 20)
- Re: L6-20P -> L6-30R Brandon Galbraith (Mar 20)