On 17 November 2011 21:12, Wayne Stallwood <ALUGlist@digimatic.co.uk> wrote:

The current transformer needs to be attached to a cable carrying a single pole (Live) of a single phase...If you attach it to say a mains flex feeding a 4 way extension bar then the two poles (Live and Neutral) of a single phase in the flex have opposing fields and therefore cancel each other out.

That's a very good point, and I really should know better!

Since we're on the subject, is there a good reason why the CT should be put around the live feed from the main meter to the consumer unit, rather than the incoming live to the meter? It only fits around the latter...

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