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For N (Neutral cable)
Turn the digital multimeter to 750V AC, use your one hand to hold the
metal end, and then the other hand insert the pen to the N port of the
socket. See the following figure. If the multimeter shows 0, then you can
see current N cable connection is standard. If the value is more than 10,
then you can see there is inductive current and the neutral cable
connection is not proper. If the value is 120, then you can know
misconnected the neutral cable to the live cable.
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