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Open Roads Forum  >  Tech Issues

 > 110/220 volts

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bobdeb

Grovetown Ga

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Posted: 11/30/06 03:50am Link  |  Print  |  Notify Moderator

I remember reading, and think it was here somewhere, that the 50A service at campgrounds was 220 VAC and the 30A was 110. After checking with 5 others that use the 50A plugs they have 110vac systms in their RV and do not use any type of adaptor. This sort of lads me to believe that whether it is 30A or 50A it is still 110 VAC. Also I have a "dog bone" adaptor that converts my 30A male to the 50A recepticle at campgrounds. Unless it is wired internally to use 110 something is amiss. What am I missing here??

oldham

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Posted: 11/30/06 04:38am Link  |  Print  |  Notify Moderator

The easiest way to remember it is that 220 volts is the same as 2 110 volt lines going into the unit. Internally, they may use only the two 110 volt lines to apply power to different items. If required, like for a washer/dryer 220 may be required. then you use both lines to get the power for it. The dog bone probably just uses half of the 220 volts. I don't know if an RV uses 220 or 110 on the 50 amp service but I do know the 30 amp service is 110. I have read specs on some RVs and they do indicate that 220 @50 amp is being used. Does that make it clear as mud???


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bobdeb

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Posted: 11/30/06 04:51am Link  |  Print  |  Notify Moderator

I just want to be sure that when I plug into a 50A plug with the adaptor it doesn't fry everything. I cant imagine the dog bone not converting to 110 so that doesn't happen buttttt stranger things have happened. Thanks

Roadpilot

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Posted: 11/30/06 05:40am Link  |  Print  |  Notify Moderator

50 amp RV service has 4 wires. One is ground, one is neutral and then there are two out of phase 110 vac wires. If the load is connected to either of the 110 wires to neutral the voltage is 110. If you connect the load from one of the 110 vac wires to the other wire the voltage is 220 vac since they are out of phase. Out of phase means opposite polarity or reversed voltage.

So you either have two 110 vac lines at 50 amps or one 220 vac line at 50 amps depending on how they are hooked up in the RV. Most RV's only use the two 110 vac wires as 110. Some high end coaches use the two 110 vac lines but also have some loads (dryers) across the two to get 220 vac.

A standard RV 50 amp connector is the same as a 220 vac connector you might find in your house.


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TubaPete

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Posted: 11/30/06 05:48am Link  |  Print  |  Notify Moderator

The above answers are correct, but reducing to the simplest terms:

30 Amps is 110 volts only
50 Amps can be 110 OR 220 volts. Most RVs only use 110 volts. A standard dog bone will handle it correctly.

There is more power AVAILABlE with a 50 amp. How much more is an endless discussion. It is only available. A 50 amp circuit will not force the extra power into your unit. Another common misconception.


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Posted: 11/30/06 07:07am Link  |  Print  |  Notify Moderator

Can't believe it's been three days already. Seems like we talked about this just yesterday.


Yep, actually drove to all of these places---in the last eight years. Missed Rhode Island and New Jersey.


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wolfe10

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Posted: 11/30/06 08:40am Link  |  Print  |  Notify Moderator

15 amp, 20 amp and 30 amp RV service: one hot, one neutral, one ground.

50 amp RV Service: TWO hots (as suggested 180 degrees out of phase), one neutral, one ground.

The 50 amp works just like in your stick house. They both have two hots, a neutral and a ground. IF an appliance is wired with BOTH hots, it is 240 VAC. If an appliance is wired with ONE hot and a neutral, it is 120 VAC. In most RV's appliances are ONLY wired to one hot, so they are 120 VAC, but you still have two hots coming to the RV breaker box/fuse box.

In a 30 amp male to 50 amp female adapter, the single hot in the 30 amp side is connected to BOTH hots on the 50 amp end.

So plugging in your 50 amp shore power cord or using an adapter, plugging into a 30 amp outlet WILL BE FINE AS LONG AS THE RV AND OUTLETS ARE PROPERLY WIRED-- which 99% are.

* This post was edited 11/30/06 09:44am by wolfe10 *


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Posted: 11/30/06 10:01am Link  |  Print  |  Notify Moderator

http://www.myrv.us/electric/

Sam


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smkettner

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Posted: 11/30/06 10:24am Link  |  Print  |  Notify Moderator

50 amp is really 100 amps at 110v on two separate feeds. If you connect to the two hot leads you have 220v. Most items are connected to one hot and the neutral for 110v. This is the same way most houses are wired.

Bob Landry

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Posted: 11/30/06 11:04am Link  |  Print  |  Notify Moderator

smkettner wrote:

50 amp is really 100 amps at 110v on two separate feeds. If you connect to the two hot leads you have 220v. Most items are connected to one hot and the neutral for 110v. This is the same way most houses are wired.


Wow! That's not even close. 50A is 50A coming in on 1 curcuit consisting of two 110V feeders, referenced to a common nuetral, 180 degrees out of phase and totaling 220V. It's not two separate 110V lines each with it's own neutral and tied together somewhere. They can be and are usually split at the distribtion panel into separate 110V curcuits, but the total power available is still only 50A, it doesn't matter how it's split up.

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