From: Bruce Griffiths

You'd need a rather thick copper jacket to shield effectively against the 50Hz magnetic field.
Bruce
==============================

Would mu-metal be any use?

 https://en.wikipedia.org/wiki/Mu-metal
 http://mumetal.co.uk/

Cheers,
David
--
SatSignal Software - Quality software written to your requirements
Web: http://www.satsignal.eu
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