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Old 03-19-2017, 07:32 PM   #1
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Using 50A vs 30A on a 30A trailer

Trailer is a 30A setup, 2017 Grey Wolf 26DBH. Is there any advantage/disadvantage to using the adapter and plugging into the 50A receptacle on the pole vs the 30A when both are available? I am sure it has been talked about before but my google search power must be weak, all I come up with are discussions using 30A power on 50A rigs. BTW will be using an EMS-pt30x as well.....or possibly hard wired if there looks like a decent place to do it. I know the breakers in the trailer are on the opposite side from electric in so not sure which route I will end up going.

Thanks!
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Old 03-19-2017, 07:45 PM   #2
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Even if you plug your 30-amp trailer into a 50-amp outlet with an adapter, you'll still have only 30 amps. A 30-amp outlet is wired to provide 120 volts on one side, and none on the other. That will provide you with 3,600 watts 30 x 120).

A 50-amp outlet is wired with 120 volts on each side for a total of 12,000 watts (50 x 120 x 2), but your trailer is wired to accept the voltage from only one side to prevent overloading your system, making the other side effectively dead.

There's no advantage or disadvantage to plugging into a 50-amp plug, so you might as well not bother with the adapter.

There's a pretty good non-technical explanation at
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Old 03-19-2017, 07:49 PM   #3
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Except that it was discussed in a thread here not long ago that the vast majority of times people are using 30 amp, and with the constant flicking on and off of the 30 amp breakers that in some parks the 30 amp breaker becomes weaker and is more susceptible to tripping. So for that reason many prefer using the 50...seems to make sense.
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Old 03-19-2017, 07:51 PM   #4
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If you find the situation of a weak 30-amp breaker, it won't hurt to use the 50-amp side, but I'd quickly report the breaker to the park manager as well.
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Old 03-19-2017, 07:55 PM   #5
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amps are drawn, not forced. You will never get more in than your rig can handle
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Old 03-19-2017, 07:58 PM   #6
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I like to use the adapter because it seems that many of the 30 amp plugs at parks have a burnt ground terminal at the post. I have been told a few different reasons why that is but the 50 amps connections always look good. So I plug in my 50 to 30 adapter and go with it. I had to replace the end on my trailer one time because of the bad connection at the park. It melted my plug because of the high resistance.
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Old 03-19-2017, 08:22 PM   #7
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How are the power posts wired? Is the 50A receptacle fed from an entirely different circuit than the 30A receptacle? I understand that the 50A receptacle has 2 legs of 50A at 120VAC with a double 50A breaker, so plugging a 30A trailer into the 50A receptacle means that your power cable is not protected at 30A but aside from that, I just wonder if the 50A circuits would have better, more reliable power since at most campgrounds the majority of trailers connect to the 30A circuit. In the heat of the summer, the 30A circuits tend to have lower voltage because of all the high loads.

I have a 50 to 30 dog bone but try to use the 30A receptacle unless I'm have power issues with the 30A supply.
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Old 03-19-2017, 08:38 PM   #8
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You are right about the breaker being 50 amps. This summer we were hooked up through the 50 to 30 connector and we were using the a/c, water heater on electric, tvs and everything. When we turned on the microwave the main breaker in the trailer tripped. Upside to that though was that we didn't have to go out in the rain to reset it.
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Old 03-19-2017, 08:59 PM   #9
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Quote:
Originally Posted by ProCharger View Post
I am sure it has been talked about before but my google search power must be weak, all I come up with are discussions using 30A power on 50A rigs.
Here are some previous discussions on this:

Pedestal 30 amp Breaker

50A site with 30A TT

30 or 50 amp?
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Old 03-20-2017, 03:28 PM   #10
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Be Careful

Even though your 30 amp breaker in your power center SHOULD trip, your cable is only rated for 30 amps. It will melt before the 50 amp breaker will trip. I wouldn't think that would be very likely, but just wanted to point it out in case you had a dead short before the load center (critter eating the insulation and wires on your incoming power feed).
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