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Old 05-03-2022, 10:13 AM   #1
Briarglenn
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Voltage drop

Power system worked great last week. New camp this week. Good power at post & cord. When I plug into 5vr I only have 48.6 on each leg at the circuit breaker. Knowledge is appreciated. I suspect a short in the belly of the beast.
 
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Old 05-03-2022, 11:31 AM   #2
rohrmann
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Initially, I would be making sure your power cord is plugged in to the trailer and the post properly. Can’t imagine a problem would develop inside from one location to the next. You might also check the cord for damage.
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Old 05-03-2022, 12:38 PM   #3
dieselguy
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If the campground has an open neutral, it will read good voltage at the post until you plug in and put a load on it. Then especially with the AC or microwave running, you'll have wacky voltages on each leg.
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Old 05-03-2022, 01:13 PM   #4
NCFischers
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You have a problem with the power coming from the pedestal. Let the campground know.
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Old 05-03-2022, 04:12 PM   #5
BB_TX
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Using voltmeter check voltage across the two poles of your main 50 amp breaker. Should read 240 vac. If not, then something wrong upstream from there.
If you measure 240 vac across the main breaker, then check each main breaker pole to neutral. If 240 vac across the breaker but low voltage on each leg to neutral, then you have a bad neutral.
Also measure the voltage from each main breaker pole to ground. That should also measure 120 vac. Good voltage to ground but low to neutral confirms bad neutral.
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Old 05-03-2022, 05:49 PM   #6
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If you have 240 volts across the two hot legs and have a bad neutral, you will get one leg very low and the other leg will be very high, but those two voltages will add up to 240 volts. I've measured on one occasion 180 volts on one leg and 60 volts on the other, and the lights inside the customer's house were extremely bright, which indicated the lights were on the high leg. A bad splice on the neutral at the weatherhead was the cause, and as soon as it was repaired, the voltage was 120 volts on each leg.
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