![]() An electrical cable usually contains three copper wires. Detailed instructions on using the tester are given in this article. The ability to use a multimeter is useful for a home craftsman and for checking the voltage at the outlet. Before installing electrical devices yourself, we recommend that you learn to use either an indicator screwdriver or a multimeter – you should not rely only on the color of the cores. On sale there are both digital, modern devices, and outdated ones, with arrows and value scales. It will always be higher than the phase-ground pair. The combination of phase-zero conductors should give a result close to 220 V.
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