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Old 07-16-2015, 07:49 AM   #25
NN5I
Carl, nn5i
 
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Join Date: Sep 2011
Location: Tallahassee, FL
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Dick, that's scary. Do you have a way to measure voltage between the neutral (white) and the safety ground (green)? It should be very small, less than a volt -- usually way less. If it isn't small, there's an open neutral somewhere in the park. If it is small, it could still be an open neutral but more information is needed (it could also be an open safety ground, which can eliminate all your worries forever).

If there's a 50 amp supply at your spot, even if you're using only the 30 amp, you can measure the difference between each hot lead (one black, one red) and the neutral (white). When one (say red) goes up while the other (say black) goes down, this unequivocally shows an open (or high-resistance, doesn't have to be totally open) neutral somewhere if the difference is more than a couple volts; and it will do so even if the safety ground is also open, enabling you to pinpoint the open neutral (but not necessarily eliminating an open safety ground, which can occasionally exist at the same time).
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