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Re: [Amps] 240V Outlet

To: "jimsmitheguard-a@yahoo.com" <jimsmitheguard-a@yahoo.com>, "amps@contesting.com" <amps@contesting.com>
Subject: Re: [Amps] 240V Outlet
From: Scott McGrath <mcgrath@fas.harvard.edu>
Date: Wed, 12 Aug 2009 20:54:00 -0400
List-post: <amps@contesting.com">mailto:amps@contesting.com>
Yes - but an amp at contest time usually runs more than 3 hours at a shot.

When I rewired the shack I used EMT so that in the event electical needs 
changed I could just pull new wires.  Installing EMT was a pain but it was 
worth it along with the halo ground with rods every 10'

I installed a bunch of 240 volt circuits for amps as the all seem to be happier 
when running on 240 nominal

And there are 240 volt wiring devices which are not twist lock like the 6-20 
which is used for air conditioners.   Twist lock is best applied in vibration 
scenarios OR when you don't want the cleaning people plugging in neither 
situation applies to the average shack

Scott N1JIN

-----Original Message-----

From:  "jimsmitheguard-a@yahoo.com" <jimsmitheguard-a@yahoo.com>
Subj:  Re: [Amps] 240V Outlet
Date:  Wed Aug 12, 2009 20:39
Size:  1K
To:  "amps@contesting.com" <amps@contesting.com>

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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