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Old 11-20-2021, 01:22 PM   #1
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50A shore power into 30A coach

My coach can take 30A shore power but has, of course, adapters for 50A shore power. I did read in a recent thread that there is a lot of current going into the RV if one does this, and to add a 30A circuit breaker.


There is already a circuit breaker for shore power input on the coach's circuit breaker/fuse panel. Will this be sufficient or should I add another?

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Old 11-20-2021, 01:27 PM   #2
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While I guess there could be a lot of debate on this, most of us feel this is just fine. Kind of like "can I drive with propane on/furnace on/etc".



The only "at risk" components are adapter, shore power cord, ATS.



As you said, the coach 120 VAC main breaker on the breaker panel protects everything else.


An acceptable risk IMO. And in many parks, outweighs the risk of very low voltage that can do a lot more damage to your electrical components on old, worn 30 amp outlets.
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Old 11-20-2021, 01:33 PM   #3
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Just because you plug into 50A power doesn't mean it somehow starts flowing into your 30A inlet. Your MH draws the power it needs based on what is turned on and the amps required. If / when the load exceeds 30A your main breaker will trip. The only way you could exceed 30A without tripping the MH main is if the inlet cord shorts and draws high amps... the pedestal you connect to should be protected with a 50A breaker and it will trip when the draw exceeds 50A. The only time you would not trip is if the cord shorted and the draw was greater than 30A and less than 50A... not likely with a cord short.
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Old 11-20-2021, 01:53 PM   #4
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Winemaker has it correct. The RV main breaker protects RV service entrance and shore power cord. The pedestal breaker protects the pedestal power supply.

Almost any consumer adapters you can buy are good to go.
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Old 11-20-2021, 02:06 PM   #5
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Thanks. No ATS in the rig so the only things that could conceivably fry are the supply cables, receptacle box and wiring to the circuit breaker panel. It shouldn't draw that much anyway.
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Old 11-20-2021, 02:22 PM   #6
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Correct.

Your coach and all its appliance will not draw a single amp more on a 50 amp connection than on a 30 amp. All limited by your coach's main breaker and the individual breakers.
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Old 11-20-2021, 04:58 PM   #7
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Winemaker has it correct. The RV main breaker protects RV service entrance and shore power cord. The pedestal breaker protects the pedestal power supply.

Almost any consumer adapters you can buy are good to go.
The RV's 30 amp main breaker does not protect the shore power cord. The cord and everything before the RV's main breaker can conceivably be damaged if plugged into a 50 amp pedestal breaker because it won't trip until 20 amps past the the wiring's rated 30 amp capacity.

But as said, I use the 50/30 dogbone because the 50 amp plug is usually in better condition. I feel that's better than having a hot worn out 30 amp pedestal plug trying to supply power.
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Old 11-20-2021, 05:16 PM   #8
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The cord is protected from overload by the 30 amp breaker in the main panel. The RV can't draw more than 30 amps or it trips the main breaker. If the cord was damaged and short circuited then the 50 amp breaker will trip.
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Old 11-20-2021, 05:21 PM   #9
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You should be protected by the main breaker in you breaker box. T
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Old 11-20-2021, 07:24 PM   #10
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If there was any real danger involved, the dog-bone adapters would not exist, the company lawyers would not allow them to be sold.
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Old 11-21-2021, 08:24 AM   #11
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The cord is protected from overload by the 30 amp breaker in the main panel. The RV can't draw more than 30 amps or it trips the main breaker. If the cord was damaged and short circuited then the 50 amp breaker will trip.
Everything between the 50A breaker on the pedestal and the 30A breaker in the RV distro panel is not protected properly. 30A service uses 10ga wire. 50A service uses 6ga wire. If the 30A wiring has a fault at the RV distro panel before the 30A breaker, you are now feeding up to 50A into the 10 gauge wire. You decide whether that is safe or not. I think it is safe, but others disagree. But saying that the RV cannot draw more than 30A is misleading. The RV can't but faulty wiring can.
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Old 11-21-2021, 08:30 AM   #12
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Everything between the 50A breaker on the pedestal and the 30A breaker in the RV distro panel is not protected properly. 30A service uses 10ga wire. 50A service uses 6ga wire. If the 30A wiring has a fault at the RV distro panel before the 30A breaker, you are now feeding up to 50A into the 10 gauge wire. You decide whether that is safe or not. I think it is safe, but others disagree. But saying that the RV cannot draw more than 30A is misleading. The RV can't but faulty wiring can.
To go along with that, 10 guage wire is rated for 30 amp use, but can it handle 50 amps long enough to allow the 50 amp breaker to trip before it overheats bad enough to start a fire ?

What's the overload rating ?
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Old 11-21-2021, 08:36 AM   #13
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To go along with that, 10 guage wire is rated for 30 amp use, but can it handle 50 amps long enough to allow the 50 amp breaker to trip before it overheats bad enough to start a fire ?

What's the overload rating ?
I think it can, that's why I think it's ok. But code would disagree. So the black and white, no real world experience answer is it is not "safe".
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Old 11-21-2021, 08:46 AM   #14
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The Camco 50 to 30 doggone adaptor is UL approved. Should count for something.

I plug my 60 watt lamp into a 15 or 20 amp outlet. If that wire shorted out, it would burn.

Should it have 12 gauge lamp cord on it ?
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