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From: John Woodgate
Subject: Re: Detecting current drawn through wire...
Date: Wed, 2 Oct 2002 23:13:48 +0100
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Thu, 3 Oct 2002 05:53:11 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Mr_Ree wrote
(in ) about 'Detecting current drawn
through wire...', on Wed, 2 Oct 2002:
> I was thinking along the lines of wrapping
>a coil of wire around the cable and detecting the increase in magnetic
You cannot detect the magnetic field by wrapping one wire round another.
You need a transformer of some variety. Run the neutral wire ONLY though
the centre hole of a toroid which has a coil wound on it. Put a LOW
value resistor across the coil. You will get a voltage proportional to
the neutral current. Change toroids and numbers of turns until you get
*enough* volts. The resistor value is immaterial but DON'T omit it: you
will get a possibly unpleasantly high voltage developed.
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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