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Old 05-30-2012, 08:08 PM   #15
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The 30A 120v RV plugand the 30A 220v dryer plug are actually not quite identical, but they are so very close you can readily manage to put the RV plug into the dryer outlet. Quickly followed by sparks and smoke on the RV.

Yeah, it was a rare lapse of good sense by the electrical standards people. The RV plug is designated style TT-30, while the dryer plug is the NEMA 10-30. The NEMA 10-30 has a L-shaped ground pin, while the TT-30 has a round ground pin, but the round pin will slide into the large L-shaped hole on the 14-30R, allowing the two hot pins on the 14-30 to feed 220v directly into the RV's 120v circuits. Ka-Blooie!
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Old 05-30-2012, 09:16 PM   #16
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More info, same subject;
RV Wiring

hope this helps
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Old 05-31-2012, 10:53 AM   #17
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Small trailers are often 15/20 amp
15 amp looks like a standard household plug, in fact that is exactly what it is
20 amp is alot like that save the neutral pin is turned sideways like this - |

Larger trailers, and small Motor homes may have a 30 amp plug. This looks like a old 3-prong dryer plug, Two flat blades and a single round pin. In fact it can plug into some of the old dryer/air compressor style outltes DO NOT DO THIS!!!!!!!!!!!!!

Many electricians when installing a TT-30 recpitical fail to read the 125 volt rating on the outlet and hook it up for 220 and wind up destroying all the electrical/electronic stuff in the customer's trailer.. Thus making him a CUSS SOME MORE.


Larger Trailers and Motor homes have a FIFTY AMP plug, this has 3 flat blades and one that is either round or "U" or "D" shaped (Dpending on the manufacturer and how you look at it.

All 3 deliver 120 volt to the MH, the last delivers either 120 volt or 240 volt depending on what you plug into as well, However very very very few RV's have anything in them that eats 240 volt with the exception of an Energery Management System.. These test for 240 volt (They do not eat it, just look for it) and that's how they know you are on 50 amps.

When pluging into one of those 30 amp (3-wire) outlets that look like an old dryer type outlet.. If you are not sure TEST IT FIRST with a proper volt meter.

Proper meter, as low as 10 bucks or less at Harbor Freeight and other places, Heck, I've seen 'em in dollar stores.

New electronics for your motor home.. start adding zeros to that, 2 or 3 at least.
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Old 05-31-2012, 09:22 PM   #18
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50 Amps is good, when I see a campground with 50 amp plugs I am a happy camper. Your plug is for 30 amps with 110 volts which most campgrounds have, the adapter plug just lets you plug into a standard 110 plug, Just remember the small standard plug is most likely 20 amps. Jim
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Old 06-01-2012, 07:58 AM   #19
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WOW....I dont mind telling you guys I think this is the best RV forum out there......Thanks for all the help.....One more week for me and my wife will be taking the old camper out camping .....Never been..........Think its going to be great...
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