[Beowulf] powering up 18 motherboards

Alpay Kasal eno at dorsai.org
Fri Feb 18 02:25:22 EST 2005


I think you hit the nail on the head Bari, I'm in Brooklyn, New York. So I
suppose it should be 15amp circuits but every circuit breaker in the box is
clearly a 10. This is an old house, seems like any renovations over the
years have been only for aesthetics. The wiring in the walls is probably
disintegrating - that would explain why the new looking circuit breakers are
rated for 10 amps.

I think I can get use of 3 circuits which gives me some room to play with
all the nodes and hopefully the assortment of switches and power supply. I
have to figure out what the draw will be on the rest of the equip. Now where
the hell am I going to plug in this air conditioner????

Any advice on how to gang up 3 10amp circuits into a single 30amp? Sounds
like a job for an electrician? Thanks for the help guys.

Alpay

-----Original Message-----
From: Bari Ari [mailto:bari at onelabs.com] 
Sent: Thursday, February 17, 2005 8:00 PM
To: Jim Lux
Cc: Dean Johnson; Alpay Kasal; beowulf at beowulf.org
Subject: Re: [SPAM] [Beowulf] powering up 18 motherboards

Jim Lux wrote:

> A 10 amp circuit would be highly unusual in the U.S., but might be 
> common practice elsewhere.  In the U.S., a 15 amp circuit is standard.

I thought this was odd when I first read this as well. This may be a 
case where to save dollars or in rehabbing old buildings where you may 
have more than 3 current carrying conductors in one raceway and you have 
to derate the current protection. In this case it may be that they ran 
more than three #14 current carrying conductors (as defined by the 
NEC)in the same raceway and had to derate the usual 15 amp circuit 
protection down to 10 amps.

-Bari Ari

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