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Old 05-30-2016, 08:49 AM   #1
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80 Amp Service

We have three ACs along with an electric clothes dryer and can only run two ACs or one AC and the dryer at one time. A dealer has offered to install 30 amp service to supplement our 50 amp service and says that if we do that we can run everything we need to at any time. Campground managers have told me that plugging in and using both services will not overload the power pedestal and one has told me he has seen the setup used. Has anyone done this and, if so, what results have you seen, what problems endured.

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Old 05-30-2016, 09:35 AM   #2
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Its going to depend on how the pedstal is wired whether it would work or not. If the 30A is simply one leg off the 50A circuit, then nope, wont work. If there is a seperate 30A circuit to the pedstal then sure, would work fine. But I would find it doubtful camp grounds would run 80 or 100A circuits to each pedistal. More like they ran one 50A circuit, and simply branch the 20A and 30A legs.
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Old 05-30-2016, 09:40 AM   #3
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Originally Posted by donniedu View Post
Its going to depend on how the pedstal is wired whether it would work or not. If the 30A is simply one leg off the 50A circuit, then nope, wont work. If there is a seperate 30A circuit to the pedstal then sure, would work fine. But I would find it doubtful camp grounds would run 80 or 100A circuits to each pedistal. More like they ran one 50A circuit, and simply branch the 20A and 30A legs.
I've considered this and I'm asking campground managers as I move from campground to campground.

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Old 05-30-2016, 10:01 AM   #4
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A separate circuit wired to your dryer and or third AC should work fine.
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Old 05-30-2016, 10:19 AM   #5
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Quote:
Originally Posted by donniedu View Post
Its going to depend on how the pedstal is wired whether it would work or not. If the 30A is simply one leg off the 50A circuit, then nope, wont work. If there is a seperate 30A circuit to the pedstal then sure, would work fine. But I would find it doubtful camp grounds would run 80 or 100A circuits to each pedistal. More like they ran one 50A circuit, and simply branch the 20A and 30A legs.

I think if the intention was to prevent the person from using more than one source, the pedestal would have to have interlocks between breakers. They don't fit them. The first protection above the pedestal would be a breaker in a locked sub panel. Some CG's have one only 50, some one only 30 amp service. That's how they economize.
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Old 05-30-2016, 10:37 AM   #6
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A separate circuit wired to your dryer and or third AC should work fine.
I'd hate to do this, not knowing if the OP possibly has a 240 volt clothes dryer, which some RV's do. A separate 30 amp would not provide 240 volts to the clothes dryer, if that is indeed what he has, and only a 50 could do this.

To the OP, it is going to depend on how the campground pedestals are wired, as to if you can get 130 amps. I know you are asking about 80 amps, but actually you are asking about 130 amps. (100+30)

I know you may be wondering how, but you need to actually understand what exactly a 120/240 volt split phase 50 amp service is to begin with.

The 50 amp service is actually TWO (yes two) 120 volt 50 amp legs...so you have 100 amps total....and why you have a double pole breaker, which is in reality two 50 amp breakers tied together so if one side gets more than 50 amps, then both sides trip...which helps protect the common neutral shared between them.

As long as the outlets are correctly run off the bus bar in the pedestal, you should be OK...and I say 'should'. If the campground for some reason slaved the 30 amp outlet directly from one of the legs going to the 50 amp outlet..then you are going to have problems, but should be able to tell this from the circuit breakers and if each outlet has a separate breaker for each one.

Are we more confused than ever?

Here is a link which explains it better, and what is called load balancing:

Electrical Tutorial - Chapter 3 - 30 Amp versus 50 Amp

RV Electric

and here are some pics to help:





and then when you get inside your RV, you can either get 120 volts if you keep L1 and L2 as separate circuits to your appliances....or you could get 240 volts if your clothes dryer possibly draws from both L1 and L2.

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Old 05-30-2016, 10:58 AM   #7
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With all these high amperage "take every home amenity with you" coaches becoming more prevalent at "old school" campgrounds they will soon raise their prices to cover the cost of electricity.

I mean the average 1500 sq ft home has a 200A service and people are driving around with the need of 100A for 500 sq ft.

Hmmm, maybe this is a business opportunity for high class coach only campgrounds with wide flat access. Could be a win, win for all.
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Old 05-30-2016, 11:06 AM   #8
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Based on the OP's original post the close dryer would seem to be 110V, must be something new 240v dryers in RVs, are there campgrounds supplying 240V power at the pedestals boy this industry is changing fast.
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Old 05-30-2016, 11:09 AM   #9
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Based on the OP's original post the close dryer would seem to be 110V, must be something new 240v dryers in RVs, are there campgrounds supplying 240V power at the pedestals boy this industry is changing fast.
Yes, it highly likely he has a 120 volt dryer, but there is always the possibility he doesn't, which is why I try to stay away from absolutes.

ANY campground offering a 50 amp outlet, is offering 240 volts at the pedestal. This is nothing new. It's all explained in my previous post and links/pics, as many campers just don't fully understand what a 120/240 50 amp split phase service is. You can get 120 volts OR 240 volts from it. It's always been that way and is nothing special.

The first pic above is fairly self explanatory on this, and how a split phase service is just two 120 volt hot legs, which provide 120 volts when separate.... or 240 volts when used together by an appliance. It's just like anything in your house that needs 240 volts.

And not knowing exactly what dryer the OP has, or if it's a combo unit, etc...there is always the possibility he could have a 240 volt one like this in his RV:

http://www.rvpartscountry.com/Whirpo...FUY6gQodVBsJ5A
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Old 05-30-2016, 11:29 AM   #10
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You are 100% correct there is 220 at the pedestal however most RVs treat this as two separate 110 circuits which allows for a greater wattage draw then one 30 amp circuit.

You are also correct that some of the newer high end coaches do utilize 220 from the pedestal, I think the new all electric Tiffin does this.

this 220 at the coach is something new to me
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