How To Test Wires For Power With Multimeter. Test the wire using a multimeter. Using CT I measure the current usage and voltages for each phase LINE wire.
In simple way you can check if a wire is live without tester and voltmeter by connecting each wire and check which one makes light to. Always check to see if the tester is working properly before using it to check for voltage. There are only two ways to ensure that electrical current is off to a set of wires.
Touch your test leads to the output terminals of the transformer.
The other is to use a circuit tester touched to the wires to indicate whether wires are hot or not. Allow the multimeter to display the voltage and then repeat the tests while probing L1 and L3 then L2 and L3. Making Sure Your Tester Works. I get 1A 05A 0A on each of the phases 15A I get 43A on the 4th wire.
