resistance in the neutral?


Old 06-25-12, 06:03 PM
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Join Date: May 2010
Location: USA
Posts: 21
resistance in the neutral?

I got a voltmeter and found that the voltage at one outlet increases by 1 V when the 1 KW microwave goes on. This outlet is on the other side of the electrical service from the microwave.
Also, one side of the electrical service has higher voltage than the other side, by about 4 V.
I've heard that if the neutral isn't well grounded it can cause such problems. But are small differences like this normal, or something that needs fixing?
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Old 06-25-12, 07:24 PM
Tolyn Ironhand's Avatar
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Join Date: Nov 2007
Location: Twin Cities, MN
Posts: 12,285
Voltage is nominal (kind of like a 2x4) and a variance of +/- 10% is considered normal. So, on a 120 volt circuit anything between 108 - 132 volts is fine.

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