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Old 09-09-2014, 11:08 AM   #1
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50 amp receptacle breaker: 60 amp OK?

I m going to wire a 50 amp receptacle for our motorhome. I have a 60 amp 2 pole breaker for a welder I was thinking of using instead of purchasing a 50 amp, since it is already there.

Will this 60 amp breaker cause any problems? Will the breakers in the MH trip if too many amps are used?

I have a 2002 HR Neptune DP.

Thanks,eh?

Brad
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Old 09-09-2014, 11:20 AM   #2
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Caution, I am not qualified to explain the difference but I believe a 50A Welder Receptacle is not the same as your RV requirement.
I'm sure one of our Electrical Gurus will chime in shortly.
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Old 09-09-2014, 11:23 AM   #3
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Quote:
Originally Posted by dennis45 View Post
Caution, I am not qualified to explain the difference but I believe a 50A Welder Receptacle is not the same as your RV requirement.
I'm sure one of our Electrical Gurus will chime in shortly.
OP is asking about the breaker, not the receptacle.

OP: I would get the right breaker.
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Old 09-09-2014, 11:28 AM   #4
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The 60 amp 2 pole breaker is over rated for your 50 amp coach. If you were to have some type of problem, the 60 amp breaker will not trip as soon as a 50 amp breaker would.

Purchase the correct 50 amp 2 pole breaker and you will not only be safe but done with the project instead of having to go back and re-do it later.

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Old 09-09-2014, 12:30 PM   #5
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It depends on the transfer panel rating that is used in your motor home and the rating
of the receptacle and wire size being used for the service.
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Old 09-09-2014, 12:46 PM   #6
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Well, if you were located in the city known as Lost Wages I would suggest you consult with a odds-maker to discuss the odds of using a 60 amp breaker pair causing a problem,, I suspect, those odds are actually mostly in your favor.

However anywhere else .. The cost of a 50 amp pair is low enough to make the phrase "Cheap insurance" come to mind.

And thus, I shall recommend that course of action.
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Old 09-09-2014, 08:56 PM   #7
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Since the 50 amp plug/receptacle can overheat and fail with a long term overdraw especially during a brownout even on a 50 amp breaker is it worth the saving the $30 to $50 on the right sized breaker for the outlet to risk a motor home that still has a retail value of around $35,000? Its one thing to loose a toaster or vacuum cleaner due to the breaker not tripping however you are risking an overheat and fire on everything between the 50 amp receptacle and the 50 amp main breaker in the coach. Yes in the old days people did get away with putting a penny in a fuse socket and screwing a burned fuse down on it or replaced a 20 amp fuse with a 30 to get away with not having to purchase the correct size fuse however a good number also burned their homes down.

How lucky do you feel? When you roll the dice like that there is always the chance of crapping out.

Me I'd purchase the right sized breaker even if money was tight as we are only talking about the same value as a few pizzas or brown bagging lunch for a few days.
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Old 09-09-2014, 09:17 PM   #8
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lowes has 50 amp breakers about 11 bucks
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Old 09-09-2014, 09:22 PM   #9
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The breaker is sized to the smallest capacity of the circuit without exception...PERIOD!

If the outlet is specified as 60 amp @ 240 VAC and you only had #10 wire then you would use a 30 amp breaker due to tge wire limiting the ampacity.

The outlet is rated 50 amp so that limits breaker to 50 as long as correct wire is used.

Larger breaker would mean big trouble if you had a fire.

Plus if you have a welder outlet it is likely only 3 wire....L1. L2 and safety ground and you would need a neutral to be good.
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Old 09-09-2014, 10:14 PM   #10
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Affording the breakers isn't an issue. If I could safely use the 60A breaker, I would. Since I cannot, I will purchase the proper one.

Thanks for everyones input! I m off to Lowes on the morrow.

Brad
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Old 09-10-2014, 03:31 AM   #11
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lowes has 50 amp breakers about 11 bucks
Home Depot has some for $8.25 however those only fit a Synder Square D panel. Range is from $8.25 to $177 depending on the panel you have and if per local code you need GFI protection on an outlet used for a device that is located outdoors.
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Old 09-10-2014, 08:32 AM   #12
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Were you planning on using the existing receptacle and wiring? If it is wired to provide 240 volts with a neutral and ground to a four position receptacle you are fine. The motor home has 50 amps breakers and will not draw more than 50 amps before tripping in the motor home entrance panel. If every thing is rated for 60 amps on your side you are actually safer. I have yet to see a motor home ever coming close to 50 amps per leg.

This is the right receptacle NEMA 5-50R

50 amp 120/240 volt 3 pole with ground

If the receptacle is wrong you could make an adapter.

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Old 09-10-2014, 09:37 AM   #13
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I'm going to run about 25 feet of #8 3 wire with ground from the subpanel to the outside outlet.

The 60A 2 pole breaker is very,very old. I'm going to replace it with a fresh one.

I ll report back on the progress. Might not get to it for a few days. We are in the middle of moving out of our house and into our MH full time. We are parking for the winter at a friends home and are in need of a 50A service outlet there.

A large moving sale is planned for a week from this Saturday. Anyone in the Roseburg,OR area is welcome!
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Old 09-10-2014, 09:44 AM   #14
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Perhaps the experts can tell me why your panel at the S/B has a 200 amp main that ends at 15 amp breakers and it's OK. And a 30 amp RV can use a 50amp post with a cheater and it's OK, but not use a 60amp to a 50 amp.

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