Bob Landry
Austin, texas
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#12 wire is rated for 20A. #10 is rated for 30A. Even on very short runs, #12 can overheat causing a potential fire hazard.
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TT_Tim
El Paso
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DavidP wrote:Also agree, #12 wire is rated 20 amp and # 10 wire is 30 amp.
If you ran everything in the coach that # 12 wire could potentially get very hot. If you plan on keeping the # 12 wire I would install a 20 amp breaker in place of the 30 amp that will be legal/code and a much safer set up.
Yes, simply swapping the 30A for a 20A breaker would be an easy fix. It would probably be enough for the AC as long as you don't run anything else.
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Gale Hawkins
Murray, KY
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Over wire/under fuse if not going with specs. 
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Bob Landry
Austin, texas
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Gale Hawkins wrote:Over wire/under fuse if not going with specs.
That's an easy fix and is acceptable, however, if the outlet is being installed with the intent of using it for a travel trailer, I would go ahead and set it up correctly for 30A and use it without worry.
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txtaco
Richmond, Texas
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Pulled #10 wire thru today.... thats what I get for listening to the guy at Home Depot. Add another $45 to the total - thanks all for pointing that out.
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livingaboard
Everett wa
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I used 8 gauge for my 50 amp..I only have a 6 foot run from the circuit breaker panel to the outlet.
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Bob Landry
Austin, texas
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Even 6 feet is likely to overheat if you draw the full 50A. Until you get over 50' or so, wire length doesn't mean as much as it does with DC power.
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DavidP
Raleigh
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txtaco wrote:Pulled #10 wire thru today.... thats what I get for listening to the guy at Home Depot. Add another $45 to the total - thanks all for pointing that out.
Smart move instead of stepping down the breaker to 20 Amp.
Return the expensive GFI 30 Amp breaker for a Standard 30 Amp breaker. That will save you a couple bucks on the install.
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Bumpyroad
Virginia
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a question on having two GFI devices in series. other than the mentioned false tripping possibility, is there any problem with the effectiveness of them when doing this? For example, my hot tub is plugged into a house circuit with a GFI breaker and I also have a GFI device in the lead to the tub. am I doubly protected, singly protected, or not protected at all?
thanks,
bumpy
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DavidP
Raleigh
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Bumpyroad wrote:a question on having two GFI devices in series. other than the mentioned false tripping possibility, is there any problem with the effectiveness of them when doing this? For example, my hot tub is plugged into a house circuit with a GFI breaker and I also have a GFI device in the lead to the tub. am I doubly protected, singly protected, or not protected at all?
thanks,
bumpy
Would be overkill but if you don’t have problems with it tripping it is fine, I say leave it. The tub install would typically require just GFI breakers on the sub panel feeding the tub. The main panel would be a standard breaker.
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