Forum Discussion

Explorer

Jun 11, 2013

How do I know if outlet is 30 amp or 50?

We are borrowing an RV, which has 30 amp service. Years ago we had an outlet installed for an RV at our house, but I have no idea if it is 30 amp or 50 amp. There is nothing on the outlet to identify it and there is nothing on the panel to identify it. So the first question is whether there is a difference in appearance between the two outlets? The second part is if it is a 50 amp outlet can I plug a 30 amp RV into it and if so...does that require an adapter. Thanks for any assistance.

Seeking Advice

jonhunt
Explorer
Jun 11, 2013
Changed preferences and now have images. Thanks.
jonhunt
Explorer
Jun 11, 2013
The image isn't showing due to my preference setting, but the answer above should help me solve the puzzle. Thanks a bunch.
DougE
Explorer
Jun 11, 2013
Way to go, RoyB! That will certainly help the neophytes.
RoyB
Explorer II
Jun 11, 2013
In the RV WORLD the 30AMP and 50AMP pedestal connections look like this

Your trailer shore power connection will only plug into one or the other.

This is a RV 50AMP Trailer Shore Power Cable Plug

This is a RV 30AMP TrailerShore Power Cable Plug

Roy Ken
mowermech
Explorer
Jun 11, 2013
30 amp outlet/plug: 3 holes/pins
50 amp outlet/plug: 4 holes/pins
No, they will not interchange. Yes, an adapter can be purchased to go either way.
If you look at the socket closely, there should be numbers and letters printed on it. Part of that number/letter combination will be 30A or 50A.