[169899] in North American Network Operators' Group
Re: L6-20P -> L6-30R
daemon@ATHENA.MIT.EDU (Jay Ashworth)
Wed Mar 19 23:00:30 2014
Date: Wed, 19 Mar 2014 23:00:05 -0400 (EDT)
From: Jay Ashworth <jra@baylink.com>
To: NANOG <nanog@nanog.org>
In-Reply-To: <532A117A.3050001@rollernet.us>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
----- Original Message -----
> From: "Seth Mattinen" <sethm@rollernet.us>
> 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.
Well, the situation were were discussing was replacing
30A CB <--> 10 AWG <--> L6-30
with
20A CB <--> 10 AWG <--> L6-20
and as I was reminded, you'd still have to derate that unless the
CB was magnetic. And you can't leave the breaker at 30, cause then the
attached 20A single device isn't protected properly by it.
So I was worng on the derating.
Cheers,
-- jra
--
Jay R. Ashworth Baylink jra@baylink.com
Designer The Things I Think RFC 2100
Ashworth & Associates http://www.bcp38.info 2000 Land Rover DII
St Petersburg FL USA BCP38: Ask For It By Name! +1 727 647 1274
