new ring main installation tripping out

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photo is here for my secret helper ;) he knows who he is

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photo is here for my secret helper ;) he knows who he is...
Attempting to undertake insulation resistance tests with a multimeter are pretty futile (and potentially dangerous, since the results can easily give 'false reassurance/confidence'), since many faults will only show up with a much higher test voltage (500V is the 'normal') than the very low voltage used for resistance measurement by a battery-powered multimeter.

Kind Regards, John
 
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Attempting to undertake insulation resistance tests with a multimeter are pretty futile (and potentially dangerous, since the results can easily give 'false reassurance/confidence'), since many faults will only show up with a much higher test voltage (500V is the 'normal') than the very low voltage used for resistance measurement by a battery-powered multimeter.

Kind Regards, John

So I've read. Not the only dead test though is it..
 

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