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Discussion Starter · #1 ·
I know that a 30A RV receptacle is 120V, 2-wire W/gnd.

I also know a 50A RV receptacle is 240V, 3-wire W/gnd.

My question is, if the RV needs the 50A 240V, is there any loads that actually run on 240V?
 

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A Little Short said:
I know that a 30A RV receptacle is 120V, 2-wire W/gnd. I also know a 50A RV receptacle is 240V, 3-wire W/gnd. My question is, if the RV needs the 50A 240V, is there any loads that actually run on 240V?
The AC.
 

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Discussion Starter · #3 ·
I was told by someone that the AC actually ran on 120V and the one's that require 50A was because they had two AC units. The 50A was so the loads could be split up and balanced.

That's why I asked here, figured someone would know.
 

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The answer is:

Depends on the RV.

Some have all 120v loads, some have 240v loads.
 

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A Little Short said:
I was told by someone that the AC actually ran on 120V and the one's that require 50A was because they had two AC units. The 50A was so the loads could be split up and balanced. That's why I asked here, figured someone would know.
Why do you need to know?
 

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I was told by someone that the AC actually ran on 120V and the one's that require 50A was because they had two AC units. The 50A was so the loads could be split up and balanced.

That's why I asked here, figured someone would know.


Some A/C units will run on 120v, usually the smaller one's.
With larger one's, as they need more power, it is easier to go for 240v.

So what do you have in mind ?
Or are you just curious ?
 

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Discussion Starter · #7 ·
Why do you need to know?
I was asked to wire a building and install a 50A RV receptacle. The guy already had the feeder wire ran by someone else on a previous job.
The other electrician (if you want to call him that) only ran #10 wire fed from a 30A breaker to the building.

I explained to the guy that he couldn't have a 50A RV receptacle with only a 30A feeding it. Well not with any other loads running anyway.
He said he thought a 30A would work. I asked him about any 240V loads and he couldn't tell me and I didn't see the RV.

Just wanted to be sure he didn't try to run any 240V loads off of a 120V 30A receptacle.
 

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Discussion Starter · #8 ·
The answer is:

Depends on the RV.

Some have all 120v loads, some have 240v loads.
Some A/C units will run on 120v, usually the smaller one's.
With larger one's, as they need more power, it is easier to go for 240v.

So what do you have in mind ?
Or are you just curious ?
Just found this:

Almost ALL 50-amp wired RV's use both sides of the service separately as 120 volt on each leg. Only a few mostly high-end coaches utilize the 240-volt from this same service.
The 50-amp 3-pole 4-wire service is superior to the 30-amp service because of the total amperage available.
30-amp 120-volt service = 3,600 watts
50-amp 120/240-volt service = 12,000 watts
From here: http://www.myrv.us/electric/
 

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RVs are strictly 120v - the 50A 240V is just to allow for more 120v circuits there are no 240v circuits in an RV. The Ac units are all 120v.
 
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