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Old 05-19-2019, 01:29 PM   #21
Rsmarlow82
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Get a licensed Electrician

House wiring and RV wiring has some similarities BUT is not the same. Not to be confused, so please be careful. Either can kill you in a split second ...

Our camper has 50 amp , single phase , 120 volt which allows us to run (2) A/C units, micro, hairdryer etc . With 30 amp, drop the 2nd a/c unit and maybe more .. amperage is all about the amount of work Nothing on board is 220 v

Please be careful
 
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Old 05-19-2019, 02:53 PM   #22
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Originally Posted by BB_TX View Post
There is nothing special about it. It is essentially the same as your house. There is 240 vac coming in on two separate 120 vac split phase lines. Read the info on the link below.

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

Everything in your rig uses 120 vac. But some people have added a 240 vac clothes dryer.
This is the correct answer. Most of the others are BS while some are close. Your RV is wired the same as your house with a 240V feed line from the electric utility. The only difference is your RV has no 240V appliances, but could have.

Wire a correct outlet to a 50 amp two-pole breaker in your house/barn/garage breaker box and all will be fine.

Consult local codes to keep the wiring safe.
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Old 05-19-2019, 05:03 PM   #23
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You know the questions and responses he is making tells me he has no idea whet he is doing. My opinion. So let’s not just say yep go ahead and do it as we just may have a crispy critter on our hands.

The best response is get a licensed electrician.
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Old 05-19-2019, 05:14 PM   #24
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I have wired a couple houses and my machine shop both single and three phase. That doesn’t mean I know what I’m doing. It sounds like you know less than I do. Either get someone who does know or be prepared to ruin stuff in your camper.
It’s your camper.
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Old 05-19-2019, 05:59 PM   #25
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New owner 50 amp question

Simple answer. Yes the plug you are installing is technically a standard 220 volt plug.
But.
Your coach has 2 entirely separate 110 volt systems. So half of the coach runs on 1 wire. The other half runs on the second wire. This is why you need to balance your load and not pull everything off of 1 wire (or leg)

If you were to put a multi meter across the 2 hot wires on your newly installed plug, it would read 220 volt.
If you were to put the same meter on 1 hot wire and 1 natural wire, it would read 110 volt

Clear as mud.
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Old 05-19-2019, 06:53 PM   #26
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The service outlet you plug into is 50 amp 220 vac. Your breaker panel in the RV takes the 220 and provides you 110 vac to appropriate circuits. If you have a clothes drier you will have a 220 circuit going to it.
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Old 05-19-2019, 07:01 PM   #27
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I have never heard a Montana owner say they had a factory 220 vac outlet for their dryer. My dryer (and every other I have heard of) runs on 120 vac and there was no 220 vac outlet installed by the manufacturer.
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Old 05-19-2019, 07:11 PM   #28
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Before you plug your trailer into the outlet, you need to check and make sure that you have 110 on both sides of the plug. Because if you have 220 on one side and nothing on the other you will be buying at least a new microwave or put it this way that's what I had to do.
Got in a hurry and didn't check volts on outlet before plugging into it. Guess my thoughts who me make a mistake!!!!
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Old 05-19-2019, 07:20 PM   #29
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Quote:
Originally Posted by DaleRobertson View Post
The service outlet you plug into is 50 amp 220 vac. Your breaker panel in the RV takes the 220 and provides you 110 vac to appropriate circuits. If you have a clothes drier you will have a 220 circuit going to it.

That is not correct. Te outlet is a 120/240 outlet. It has two phase conductors, a neutral and a ground vs two phased conductors and a ground.

There is a lot of anecdotal information in this thread and the OP should take it with a grain of salt and seek professional assistance. This dog bites and it will kill you.
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Old 05-19-2019, 07:48 PM   #30
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I would urge the OP (and most everyone else) to disregard everything posted so far and go to

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

and read it thoroughly and then go to

https://www.allaboutcircuits.com/tex...power-systems/

and scroll down to Split Phase Power Systems, and read that thoroughly if you really want to understand 50 amp RV systems as well as home power. And they are the same, except home power has a higher current circuit breaker.
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Old 05-19-2019, 08:00 PM   #31
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Unless you have an older home that has a split bus service panel they are not the same. The difference is in the split bus. That panel cannot provide phase to phase voltage like a residential service or load center can.

However I agree in that the topic is serious enough that the OP should seek competent, qualified professional assistance.
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Old 05-19-2019, 08:59 PM   #32
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I agree that circuit breaker panels/load centers may be different. But the incoming power to that load center, RV or home, is 4 wire 240/120 vac split phase power.

The panel in my Monte has the main 50 amp breaker at one end and the sub breakers next to it alternating between H1 and H2, i.e. odd number breakers are on one hot and the even number breakers on the second hot. If I wanted I could install a double pole breaker and operate a 240 vac appliance.

However some Montes have the main breaker in the middle with one hot on one side and the other hot on the other side, with sub breakers on each side of the main. That configuration does not work for a double pole breaker to get 240. But again, the incoming power to the panel is the same 4 wire 240/120 split phase power.
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Old 05-19-2019, 09:22 PM   #33
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I got it.

Simple !
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Old 05-19-2019, 09:23 PM   #34
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Simple.
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Old 05-19-2019, 11:09 PM   #35
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This is the sticker on our rig near the shore cable receptacle at the rear of the rig. Regardless of whether there is a 240v service entering the rig or a 208v service, the result is the same, two separate 120 volt legs supplying power, and forget about 240v or 220v or anything else, just 120 volts only.
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Old 05-19-2019, 11:43 PM   #36
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This is exactly what I thought
If you can wire a 4 prong dryer outlet 220 volt you can wire this . Just connect it to your home breaker box to a 50 amp double throw breaker.
Do you agree?
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Old 05-20-2019, 04:30 AM   #37
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Not talking to another electrician I need to be very careful of the verbiage I use. In this scenario the customer premise equipment (CPE) makes all the difference. The issue is the not four conductors be supplied by the service, the issue is how can the four conductors be connected to the equipment. If your 2007 Monty does not have a split bus panel AND will allow the end user to install a two pole breaker across both current carrying (hot) conductors you can potentially provide 220/240V to a load in the RV and there is your problem. If however your 2007 Monty only allows for the main breaker to be installed across both current carrying conductors, allowing for all subsequent breakers to be installed in an outboard manner on a single current carrying conductor then you can only feed 120V from the distribution panel even though behind the deadfront on the main lugs only there is 220v/240v.


That is all for me on this topic. Best of luck to the OP hopefully there was something helpful within this thread. Please be careful again that dog bites. Make sure all your connections are tight and all strands of the conductors are securely under the lugs and not strayed. Double check your work. It IS simple to tighten down wires but it really helps to know where and why you are doing.
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Old 05-20-2019, 09:39 AM   #38
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Yes, it's 220, just like a dryer. 110 + 110 = 220.
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Old 05-20-2019, 12:13 PM   #39
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Originally Posted by PNW Fireguy View Post
........
If your 2007 Monty does not have a split bus panel AND will allow the end user to install a two pole breaker across both current carrying (hot) conductors you can potentially provide 220/240V to a load in the RV and there is your problem. ....
.
And that is a problem, how? It just means if I wanted to install a 240 vac clothes dryer I could do that by adding a double pole breaker and running new wires to the dryer closet.

A split buss panel would be the problem if you wanted a 240 vac dryer.

You seem to imply I don’t understand what you are saying. But you have yet to tell I am wrong in saying that the incoming power to the line side of the breaker panel, regardless of what type panel you have, is the very same configuration of single phase 4 wire (hot 1, hot 2, neutral, and ground) split phase power no matter whether to the RV from the power pedestal or to a home from the power pole. And the only difference inside is whether you can add a double pole breaker or not. If you think that power is different I would like to know what it is.
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Old 05-20-2019, 01:16 PM   #40
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Its 120 for each leg. 25 amps for each leg that's why you must balance the loads in the panel
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