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Old 12-16-2017, 04:52 PM   #1
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Exclamation RV Park Power Testing

We have been having some power issues with 'Park Power', (I think)?

I have tested the voltage on both the 30 amp and 50 amp receptacles at the pedestal and it looks good, (both wiring and voltage).

We are using a Hughes 30 amp 'Auto-former' which is keeping the voltages fairly constant.

However, I am looking for a way to test the RV Power under both a 30 and 50 amp load to see if the Park Power under load is the problem.

Is there a way to test the load ability of the Park Power at the pedestal?
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Old 12-16-2017, 04:55 PM   #2
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If you had a power monitor to plug in to that would work.
Only way is to load the circuit and check voltage drop

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Old 12-16-2017, 05:01 PM   #3
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If you had a power monitor to plug in to that would work.
Only way is to load the circuit and check voltage drop

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I have a voltage monitor plugged in and I also have a 'Kill-A-Watt' tester to test the amperage draw of our appliances. Neither one will test the incoming power at the pedestal.
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Old 12-16-2017, 05:10 PM   #4
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check the voltage at the at the pedestal with no load. Turn on your A/C and check the voltage again.
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Old 12-16-2017, 05:44 PM   #5
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check the voltage at the at the pedestal with no load. Turn on your A/C and check the voltage again.
I am not looking for voltage drop but whether or not the Park Power can actually provide the required 30 or 50 amps at the pedestal.





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Old 12-16-2017, 05:57 PM   #6
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I believe what Cavie was saying that if the pedestal voltage dropped significantly it would show the inability to source the desired 30 or 50 amps. You will always get some voltage drop. The question is 'how much'?
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Old 12-16-2017, 06:01 PM   #7
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If you are not seeing a voltage drop, it is unlikely there is a problem providing the stated number of amps. If the current drawn is too much for the infrastructure, the voltage will drop.
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Old 12-16-2017, 06:12 PM   #8
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If you are not seeing a voltage drop, it is unlikely there is a problem providing the stated number of amps. If the current drawn is too much for the infrastructure, the voltage will drop.
Are you saying that if I have 120 VAC incoming and I plug in a 13 amp heater there should be no voltage drop and I should still have 120 volts?
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Old 12-16-2017, 06:19 PM   #9
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This is one of my favorite RV electrical sites that may have some good suggestions for you.

RV Electric

Once there, click on the "outlet testing" tab on the left hand side.

After reading that page/links..... there is another hyperlink at the very bottom of that page call "under load" that may give you some ideas on testing.
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Old 12-16-2017, 06:26 PM   #10
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Are you saying that if I have 120 VAC incoming and I plug in a 13 amp heater there should be no voltage drop and I should still have 120 volts?
You must always have no less than 5% of 117-125 volts. Things will work with fewer volts but not well. My camp in MA has only 108 volts at my site. I use a step-up transformer. My Meter shows 120 with no load. Wiring in the park is too small. They did not allow for voltage drop because of distance.

Butch. 45 year licensed Master Electrician.
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