Correct, but I was trying not to complicate the matter more. This applies to
continuous loads. That's something intended to run more than 3 hours straight.
The data centers usually have 100% rated breakers on the feeders to avoid this
derating, but not on the branch circuits.
Jim Smith, EE
KQ6UV
--- On Wed, 8/12/09, Scott McGrath <mcgrath@fas.harvard.edu> wrote:
From: Scott McGrath <mcgrath@fas.harvard.edu>
Subject: Re: [Amps] 240V Outlet
To: "jimsmitheguard-a@yahoo.com" <jimsmitheguard-a@yahoo.com>,
"amps@contesting.com" <amps@contesting.com>
Date: Wednesday, August 12, 2009, 5:28 PM
One fact lost in the 15 vs 20 amp outlet discussion is the NEC requires you to
derate any circuit to 80pct of its full load capacity for loads which are
steady state. So a 20A circuit is allowed only to have 16A drawn. In data
centers we have to abide by this rule
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