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Old 04-11-2011, 09:21 PM   #1
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Electrical Adapter Question

My RV is wired with a 30 amp powercord; I had a second A/C installed on the unit that is also wired for a 30 AMP powercord. In my expierence most pedistals only have one 30 AMP plug and one 50 AMP plug. My thoughts were to get a 50 AMP to 30 AMP adapter and plug the main RV powercord into this adapter and run the main RV powercord off the 50 AMP power outlet and run the second A/C off the 30 AMP plug at the pedistal. Will this cause any problems? Does anyone have a better suggestion? What about a surge protector; I have read you cannot plug a 30 AMP surge protector into the 50 AMP to 30 AMP adapter. I would assume I would need to buy a 50 AMP surge protector and then plug the adapter into it. Any thoughts or suggestions?
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Old 04-11-2011, 10:14 PM   #2
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I dont think it matters on the surge protector...I dont think it generally matters if it is a 30 or 50 amp circuit.....

I guess I am a little confused? Do you have two 30 amp power cords coming from your unit or is that a mod you are making? If you are making mods, I dont see why it would not work if wired properly and has the proper breaks/protection in line.
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Old 04-12-2011, 12:00 AM   #3
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As long as the second power cord is just for the AC I would use a 50 to 30 adapter for one and use the 30 for the other.
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Old 04-12-2011, 06:27 AM   #4
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Quote:
Originally Posted by tafische View Post
I dont think it matters on the surge protector...I dont think it generally matters if it is a 30 or 50 amp circuit.....

I guess I am a little confused? Do you have two 30 amp power cords coming from your unit or is that a mod you are making? If you are making mods, I dont see why it would not work if wired properly and has the proper breaks/protection in line.
Yes the dealer installed the second A/C and it does have it's on 30 AMP powercord and seperate breaker.

Thanks for info; that was my plan to run the main RV 30 AMP powercord on the 50 AMP supply using the adapter, but just wanted to make sure it would not cause problems with the electrical system. Just wanted to make sure I could also plud a 30 AMP surge protector into that 50 AMP adapter as well.
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Old 04-12-2011, 06:43 AM   #5
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As long as the second power cord is just for the AC I would use a 50 to 30 adapter for one and use the 30 for the other.
If the above is true, you should be able to plug the line with just the A/C unit into the 20A using a 30A to 20A adapter. Then, you don't have to bother with the 50A circuit at all. That's how RVs requiring 50A service can get it when only a 30A and 20A recepticle are in the box. They use a special cable that has a 30A and 20A plug. The only danger they have when using it is that the polarities must be correct in both recepticles. This should not be a problem in the OP's case as his he appears to have two distinct circuits.

There are two additional advantages for using a 30A/(30A)20A setup as opposed to a 50A(30A)/30A.
  1. A 30A/20A recepticle box is more commonly found in campgrounds
  2. Campgrounds often charge extra for 50A service
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Old 04-12-2011, 08:50 AM   #6
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Originally Posted by FPM III View Post
If the above is true, you should be able to plug the line with just the A/C unit into the 20A using a 30A to 20A adapter. Then, you don't have to bother with the 50A circuit at all. That's how RVs requiring 50A service can get it when only a 30A and 20A recepticle are in the box. They use a special cable that has a 30A and 20A plug. The only danger they have when using it is that the polarities must be correct in both recepticles. This should not be a problem in the OP's case as his he appears to have two distinct circuits.

There are two additional advantages for using a 30A/(30A)20A setup as opposed to a 50A(30A)/30A.
  1. A 30A/20A recepticle box is more commonly found in campgrounds
  2. Campgrounds often charge extra for 50A service


I thought of using a 30 to 20 adapter, but cannot find that adapter anywhere; All I can find is a 30 to 15 and the A/C installer said it is not good to run the A/C on a 15 AMP outlet because the A/C is usually pulling around 18 AMPS on start-up. The installer also told me they did not make a 30 to 20 adapter, not sure if this is true, but I have not been able to find one.
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Old 04-12-2011, 09:23 AM   #7
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The post in the CG may have a 50A & A 30A outlets but thats not to say you can get 80A out of it. They probobably only have 50A available but provide both 50& 30A outlets so it will take what ever configuration the cord your RV/TT has. To get real technical your TT may never draw 50A ( by the electical code it's called deverisification)the code writers know that you won't run all your elect appliances and use all the outlets at one time so evan though you have a 50A cord and breaker you might never exceed 20-30a. If you add up all the wattages on your home appliances, convert that number to amps it could be as high as 600a and guess what your house service is maybe 100 or at the most 200a.
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Old 04-12-2011, 11:19 AM   #8
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Does anyone know if it is safe to plug a 50 AMP to 30 Amp adapter into the 50 AMP plug on pedistal and them plug a 30 AMP surge protector into that adapter. I read somewhere on the internet that this would increase the volts to the surge protector causing it to trip due to the surge in power from the 50 AMP since the surge protector is only rated for 30 AMP. Is this true or can this be done with a 30 AMP surge protector?
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Old 04-12-2011, 11:37 AM   #9
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Let me ask you this --- I thought that most 2 AC campers had a 50 amp plug? Since it is really two 50 amp 120 volt circuits - I thought they put most of the camper and an AC on one leg and the second AC on the other leg. Wouldn't that make more sense that having two 30 amp cords? If you had a 30 amp only site, you would be limited to one AC unit. You could also use the "cheater" that allows you to hook to a 30 and a 20 amp outlet and power both legs. Couple that with a good EMS and I would think it would be a nice setup.

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Old 04-12-2011, 11:47 AM   #10
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Quote:
Originally Posted by Double Eagle View Post
Does anyone know if it is safe to plug a 50 AMP to 30 Amp adapter into the 50 AMP plug on pedistal and them plug a 30 AMP surge protector into that adapter. I read somewhere on the internet that this would increase the volts to the surge protector causing it to trip due to the surge in power from the 50 AMP since the surge protector is only rated for 30 AMP. Is this true or can this be done with a 30 AMP surge protector?

Sure - you can do that. A surge protector protects in high spikes in voltage, regardless of the amperage. As long as your TT is 30 amps and your surge protector is rated at 30 amps you are good to go. The surge protector will have no idea it is really plugged into a 50 amp.
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