What is the result on the meter reading of clamping the jaws of a clamp-on ammeter around two wires?

If the two wires are on a parallel feed you would read the current through the parallel feeders. If the two wires are "hot " to the load and return back from the load the meter will read zero. The two magnetic fields that surround the wires when a current flows through them will cancel each other.As a result of this there will be no magnetic induction induced into the sensing coil of the clamp on meter.

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