[169861] in North American Network Operators' Group
Re: L6-20P -> L6-30R
daemon@ATHENA.MIT.EDU (Rob Seastrom)
Wed Mar 19 09:32:37 2014
To: Alex Rubenstein <alex@corp.nac.net>
From: Rob Seastrom <rs@seastrom.com>
Date: Wed, 19 Mar 2014 09:32:13 -0400
In-Reply-To: <2D0AF14BA6FB334988BC1F5D4FC38CB843A094D9D0@EXCHMBX.hq.nac.net>
(Alex Rubenstein's message of "Wed, 19 Mar 2014 08:00:18 -0400")
Cc: Niels Bakker <niels=nanog@bakker.net>, "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Alex Rubenstein <alex@corp.nac.net> writes:
> But my point remains. Appliance/load wire size is often, and many
> times smaller than the ampacity of the circuit.
>
> Heck, how many times have you plugged in a 14 gauge extension cord
> to a 5-20R?
I do this all the time. In (all our) defense, lamp cord is the
closest thing to conductors in free air that most people will ever run
into, and although the insulation isn't high temperature stuff, the
heat buildup isn't the same as a few dozen THHN conductors in EMT.
If you want something that will make your head explode a little (until
you think it through and realize that "ampacity" is just another way
of expressing "i^2r losses plus dissipation rate), read NEC table
630.11(A), and then 630.12(A) and noodle on just how skinny a wire you
can use for hooking up a (home, low duty cycle) welder that's
breakered at 50 amps. 12 AWG anyone?
-r
