What RV is Right for me? Handy Voltage Reference for 50 Amp Service Here is a picture of a 50 Amp Receptacle commonly found in RV Parks. I’ve added little pictures of voltmeters showing you the approximate voltage you should be seeing if you attach the probes like shown. I feel a little silly for saying it, but of course you won’t have hook up electrical receptacle volt meters so you’ll check between two connection one at a time.
The bad news, because it is behind a pile of storage boxes. If the light up with either contact – besides preventing shock, screw in the threaded connector to the sewer hook at the RV site. It will show 240 volts, or a set of kitchen plugs has gone out because of the GFI hiding behind the receptacle electrical in the dining room or nook.
Marlan blogs about living in an RV. Click on my author link to find out more about what RV52. Can you believe that as an RV Park owner I’ve seen electricians and others use these meters hundreds of times but I find it difficult to keep in my mind how the readings should look on each hole. I have copied this picture and am pasting one on my wall for handy reference. Its nice knowing I could help out.
My understanding is that 240 volts are not allowed in RV’s. I understood that both hot legs are on the same phase, therefor a measurement between them would show zero volts. The benefit of the two hot legs would be actually more than 50 amps available, but only 120 volts. I’d say it is more likely that 240 V is not commonly used. Even in a stick house the 240 V is only used for a dryer, electric range, and maybe in the garage. I believe an RV park which wires the plug so that each hot was the same phase leg would not be wired to code for that connecter. But just because you would have 240V on the RV Park pedestal doesn’t mean you would see 240V in the RV unless the RV manufacturer wired the hots such that you would have a 240V plug in the RV.
Now individual 120V circuits may have different hots they get their power from, but you should never care about that for most practical purposes. I would also think that if both hots were the same phase I would actually wonder if they were off different breakers somewhere. For a properly wired 50A plug I’m pretty sure it will show 240 V. 50 Amp 120 V circuits for a total of 12,000 Watts of power. This is substantially more than the 30A plug which would only provide 3600 Watts.