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How do you use clamp meter?
Do you just clamp the line? Or line and neutral?

Also been working with a couple of guys that have earth leakage meters and one clamps the line and neutral and the other clamps the earth?
Can someone tell me the correct ways?
Thanks
 
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PEG

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Do we know what they trying to learn,with these various methods?
 

davesparks

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To measure the leakage from a circuit you need to clamp around all live conductors of that circuit.

To measure the load current you need to clamp around the line conductor.

Clamping around the earth will only tell you the current flowing through the earth, this is not equal to the leakage of a circuit except in unusual circumstances.
 
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To measure the leakage from a circuit you need to clamp around all live conductors of that circuit.

To measure the load current you need to clamp around the line conductor.

Clamping around the earth will only tell you the current flowing through the earth, this is not equal to the leakage of a circuit except in unusual circumstances.
Spot on thanks
 

Lucien Nunes

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Lots of people seem to clamp the earth to measure leakage but if any parallel paths exist, as they often do, the result is meaningless. It might be too low if some leakage is taking a different route to earth, or too high (maybe much too high) if the same is true of a fraction of the load current arriving at the origin of a TN-C service.

As per DS, clamping L&N detects the leakage in exactly the sane way as the balance transformer in an RCD, by subtracting one from the other.
 

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