Sparking Earthing Conductor

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Penfield

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Aug 12, 2015
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Bournemouth
Hi,

Whilst carrying out a ZE test I noticed that the earthing conductor sparked when re-inserted into the earth bar. Any ideas/solutions to what may be happening.  The installation was isolated from the main switch onwards. The property is a studio flat within a block above commercial premises. 

 
I would have put the clamp meter on it to see how much current it was passing. Also measured the voltage difference when not connected.

 
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