Re: [cobalt-users] Colocation Electric Question

["E.B. Dreger" <eddy+public+spam@xxxxxxxxxxxxxxxxx>]

> Date: Sat, 30 Mar 2002 12:24:51 -0500
> From: Gerald Waugh <gwaugh@xxxxxxxxxxxxxxxxxxxxxxx>

> 20 * 120 ~ 2400 watts

20A * 120V = 2400VA = ???? Watts

You assumed a power factor of 1.00 -- which is true when voltage
and current are in phase, which is probably not the case.

Watts = VA * pf


> All equipment has a power rating.
> 120 watts is roughly equivalent to 1 amp
> thus 20 amps would power roughly 20 120 watt appliances.

Assuming that the actual current draw is 1A.  Chances are that
it's less.

Look at your home breaker box -- chances are that you have a
100A, 150A, or 200A main, but your individual breakers total a
number much higher.  Sort of the same idea.


To the OP:  Does your colo provide battery backup?  If not, you
should probably hook up your own 2400VA UPS... when it complains
about overload, you know that you have too much connected. :-)

Note also that current draw is highest when powering up
equipment.


--
Eddy

Brotsman & Dreger, Inc. - EverQuick Internet Division
Phone: +1 (316) 794-8922 Wichita/(Inter)national
Phone: +1 (785) 865-5885 Lawrence

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