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Old 09-16-2019, 09:18 AM   #1
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30 amp and 50 amp

I am looking at upgrading to a class A (50 amp) from a class C (30 amp). We stay quite often at a family members house who has full hook-ups but with 30 amp. Question?

What happens if you use the 30 amp to 50 amp pig tail plugged into the 30 amp shore power? Can you still use part of the electric in the RV? Any other issues?

I will get the 3p amp converted after we get to the family member's home.
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Old 09-16-2019, 09:24 AM   #2
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It is called a 30/50 dogbone. You rig will work verywell on it. Just need to watch what you use at one time. You only have 30 amps available but you already know how to manage electric I assume. No need to upgrade if just temp at a friends house or your house for that matter.

Remember 30 amps service is 120 volts 3 wire #10 ga. 50 amps service is 240 volts 4 wire #6 ga.
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Old 09-16-2019, 09:31 AM   #3
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We camp at State Parks with only 30amp ... simply run only 1 ac ... frig to LP ... water heater to LP ... do only 1 of the following at a time - make coffee - use a hair dryer - run the microwave ....
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Old 09-16-2019, 11:04 PM   #4
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It's sort of like dry camping with more power - you just need to manage what's on at any given moment.
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Old 09-17-2019, 03:30 PM   #5
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Originally Posted by frank4711 View Post
We camp at State Parks with only 30amp ... simply run only 1 ac ... frig to LP ... water heater to LP ... do only 1 of the following at a time - make coffee - use a hair dryer - run the microwave ....
Yup, that coffee pot and hair dryer are killers, which my wife found out after-the-fact.
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Old 09-17-2019, 03:54 PM   #6
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FYI ... The toaster & coffee pot are killers also. I found out the hard way as well while waiting for both to finish. Surprise, they never did finish until I realize breaker popped.
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Old 09-18-2019, 10:56 AM   #7
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Remember 30 amps service is 120 volts 3 wire #10 ga. 50 amps service is 240 volts 4 wire #6 ga.
Just to clarify this statement, usually NOTHING in the RV that has 50 amp service is set up to run on 240 volts. The 50 amp service is wired to both legs of the 240 volt line but the RV utilizes each leg separately at 120 volts. If you make the mistake as some folks have done and put 240 volts into your RV, you will have some very expensive scrap appliances.
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Old 09-18-2019, 11:08 AM   #8
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Just to clarify this statement, usually NOTHING in the RV that has 50 amp service is set up to run on 240 volts. The 50 amp service is wired to both legs of the 240 volt line but the RV utilizes each leg separately at 120 volts. If you make the mistake as some folks have done and put 240 volts into your RV, you will have some very expensive scrap appliances.
Cavie's statement is true. I think what he was trying to emphasize is to not plug the 30A dogbone plug into something like a home clothes dryer outlet. That is the mistake you mention that many people have made. A 50A service connection is 240V 4 wire and of course wired as you say.
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Old 09-18-2019, 11:46 AM   #9
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What is called '50 amp service' is actually 100 amp service because 50 amps are available on each leg; if you turn on everything in your camper you will not draw anywhere close to that...Why not just change the receptacle and the breaker and make a 30 amp each leg connection available? It should run everything...
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Old 09-18-2019, 01:00 PM   #10
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Not trying to hijack the OP's thread, but what does it take to convert a household 15 or 20 amp circuit to a 30 amp circuit? Obviously the breaker has to be changed out but would the wiring from breaker to plug have to be different too? Thanks!
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Old 09-18-2019, 01:09 PM   #11
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The function of the breaker is to protect the wiring in the house from being overloaded. Never change a breaker to a higher capacity one without changing the wiring in the entire circuit to handle that load. Remember that several outlets are usually daisy chained so the wiring to all of them must be changed even if the high load item is only plugged into the 1st one in the chain. You also need to change the the outlet.
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Old 09-19-2019, 03:32 AM   #12
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Quote:
Originally Posted by dannyabear View Post
What is called '50 amp service' is actually 100 amp service because 50 amps are available on each leg; if you turn on everything in your camper you will not draw anywhere close to that...Why not just change the receptacle and the breaker and make a 30 amp each leg connection available? It should run everything...
Because you must also change the panel out to a 240 volt 4 wire system. Then you could not plug into a standard 30 amp 120 volt receptical.

It is NOT called a 100 amp service. __ Your 200 amp service at homes is not called a 400 amp service. Both services are the same. One 50 amp and one 200 amp. Read The # on the breaker. Both are 2 120 volt lines. 240 volts Line to Line.

If you call a campground and say "I have a 100 amps service" they will not have anyplace for you to stay.
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Old 09-19-2019, 03:49 AM   #13
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Originally Posted by bubbles View Post
Cavie's statement is true. I think what he was trying to emphasize is to not plug the 30A dogbone plug into something like a home clothes dryer outlet. That is the mistake you mention that many people have made. A 50A service connection is 240V 4 wire and of course wired as you say.
30 amp 120 volt RV plug will not plug into a 30 amp 240 volt dryer outlet. Can not be physically done.

What happens is a stupid electrician wires a 30 amp 120 volt outlet to 30 AMP 240 volt circuit. The correct voltage is written right on the outlet.
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Old 09-19-2019, 03:53 AM   #14
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Originally Posted by ArkRVHog View Post
Not trying to hijack the OP's thread, but what does it take to convert a household 15 or 20 amp circuit to a 30 amp circuit? Obviously the breaker has to be changed out but would the wiring from breaker to plug have to be different too? Thanks!
Yes, you would have to change the #10ga 3 wire system to a #6ga 4 wire system. Then you would have to change out the Circuit breaker box also.
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Old 09-19-2019, 04:53 AM   #15
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Yes, the wire would need to be changed. Circuit breakers are matched with the correct wire size, there are charts showing the correct wire gauge for different breakers. If you use too small a wire it can overheat and cause a fire.

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Originally Posted by ArkRVHog View Post
Not trying to hijack the OP's thread, but what does it take to convert a household 15 or 20 amp circuit to a 30 amp circuit? Obviously the breaker has to be changed out but would the wiring from breaker to plug have to be different too? Thanks!
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Old 09-19-2019, 05:33 AM   #16
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Yes, you would have to change the #10ga 3 wire system to a #6ga 4 wire system. Then you would have to change out the Circuit breaker box also.
Don't you mean for a 30amp you'll need 10ga ? 6ga will run 50amp. I ran my garage with 10ga for my 30amp plug. (per certified electrician recommendation)
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Old 09-19-2019, 05:39 AM   #17
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Originally Posted by TheWolfPaq82 View Post
Don't you mean for a 30amp you'll need 10ga ? 6ga will run 50amp. I ran my garage with 10ga for my 30amp plug. (per certified electrician recommendation)
Seems I quoted the wrong post
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Old 09-19-2019, 06:44 AM   #18
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