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Earth Leakage Clamp Meter - Great Tool!

Foffer
Maybe I'm behind the times and you've all known about these for years!


I've just started using a Megger DCM305E clamp meter which can measure current from 0.001mA to 100A, meaning that its prime application is measuring earth leakage.  Clamping around both meter tails together or around the cores of a specially made extension lead test rig quickly helps track down the offending item causing RCD/RCBO tripping.  This tool speeds up fault finding a great deal and causes minimum disruption in a working environment.


Just wanted to bring this tool to the attention of anyone who like me hadn't heard of it before!


Also, I don't know if there are similar tools made by other manufacturers.....
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    yup - very good for those 'how close is this RCD to tripping' tests and also if used with care for pairing up  single phase lives and related neutrals in an energised board when the spaghetti monsters have wired it. One live at 15.2A must pair with the neutral carrying the same value. Or if not then  there is a shared neutral somewhere.

    I presume you have now noticed that L-N does not always equal the current in the CPC, as some electrons escape via other paths like the TV antenna or the phone line or the plumbing.. The other trick is to put the wire through the loop twice to increase the sensitivity if need be.
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    yup - very good for those 'how close is this RCD to tripping' tests and also if used with care for pairing up  single phase lives and related neutrals in an energised board when the spaghetti monsters have wired it. One live at 15.2A must pair with the neutral carrying the same value. Or if not then  there is a shared neutral somewhere.

    I presume you have now noticed that L-N does not always equal the current in the CPC, as some electrons escape via other paths like the TV antenna or the phone line or the plumbing.. The other trick is to put the wire through the loop twice to increase the sensitivity if need be.
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