[66533] in North American Network Operators' Group
Re: Looking for power metering equipment...
daemon@ATHENA.MIT.EDU (David Lesher)
Thu Jan 15 09:12:33 2004
From: David Lesher <wb8foz@nrk.com>
To: nanog@merit.edu (nanog list)
Date: Thu, 15 Jan 2004 09:17:47 -0500 (EST)
In-Reply-To: <Pine.LNX.4.44.0401150845390.17526-100000@ls04.fas.harvard.edu> from "Scott McGrath" at Jan 15, 2004 08:57:46 AM
Reply-To: wb8foz@nrk.com
Errors-To: owner-nanog-outgoing@merit.edu
Speaking on Deep Background, the Press Secretary whispered:
>
>
>
> Concur with you need wattage not amperage. There is a 'relatively' cheap
> method of doing this however local electrical codes may put a damper on
> this type of project.
>
> You put a current transformer on each branch circuit. A 'typical' current
> transformer will generate 1Millivolt per Milliampere. You then install a
> A/D board in a PC and write a simple application to query each channel of
> the A/D. or purchase a commercially available SMNP datalogger.
>
I assume Alex is looking for a boxed solution. If not concur
it's Not Rocket Science [TM-Click&Clack] to build a system. You
can do the voltage sensing safely. {My too-early AM thinking is
that there will be too little phase shift in an unloaded Voltage
Transformer to worry about.}
You'd need a VT per panel leg, but a CT per branch circuit.
--
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