Just traded some dozer work for a 2001 Montana 5th wheel. Needs some tlc. Anyone who has one of these I have a question or two. The power cord that plugs in the back has had a bad connection and guess it sort of stuck itself, got hot and stuck together. 50 amp. This looks like a 240 volt set up. Is this correct? I'm going to cut the thing apart and get a new one. The other end is the classic welder plug. Trouble end looks like a twist lock deal in center of the rear. Thanks
- Thread starter LeakyBoot
- Start date
Steve@Advance
Well-known Member
It may be 240v, but then it might be 120v.
You'll need to find out for sure before connecting it.
Take a look at how it is wired, look at the AC units, see what the voltage is, look at the 12v supply, see what the input voltage is.
I've never seen an RV with 240v components. I hear some 50 amp services are 240 volt, but divide the 2 legs into separate 120v circuits.
Might check with a dealer or find an owners manual online. Be a very expensive mistake to connect it wrong!
You'll need to find out for sure before connecting it.
Take a look at how it is wired, look at the AC units, see what the voltage is, look at the 12v supply, see what the input voltage is.
I've never seen an RV with 240v components. I hear some 50 amp services are 240 volt, but divide the 2 legs into separate 120v circuits.
Might check with a dealer or find an owners manual online. Be a very expensive mistake to connect it wrong!
K Effective
Well-known Member
IF someone scabbed a 240V welding plug onto the end of your 120V supply cord, you may have solved the mystery of the other end of the cord being stuck together...
BarryfromIA
Well-known Member
This is not something to experiment on. The refrigerator may have a circuit board on the back side to control the automatic switch from gas to main. They are sensitive and may be more than a $100 dollars.
BarnyardEngineering
Well-known Member
- Location
- Rochester, NY
Yes, 50A RV plug is not the same as a welder plug. It looks similar to a modern dryer plug, but again, it is not the same.
50A has four connections: neutral, two hot 120V, and ground.
The hot 120V are generally opposing phases so technically it *IS* 240V, but there is rarely anything on an RV that is 240V.
They are treated as two separate 120V circuits with a common ground and common neutral.
50A has four connections: neutral, two hot 120V, and ground.
The hot 120V are generally opposing phases so technically it *IS* 240V, but there is rarely anything on an RV that is 240V.
They are treated as two separate 120V circuits with a common ground and common neutral.
YES and NO
The 50 amp plug is a 220 volt plug, but there are no componants in the rv that are connected across both legs at the same time. So technically its really two 120 legs that share ground and neutral...
SO you can actually plug it into to 220 volts where each leg is 120 and out of phase with the other leg, or.. you can plug it in to two 120 circuits that are in phase, but each side or leg is rated for 50 amps. Be aware that the neutral will have to carry 100 amps if the two legs are in phase, and almost zero current at max current load if the circuits are out of phase...as the two "out of phase" circuits cancel each other out on the neutral. Now wrap your mind around that.
The 50 amp plug is a 220 volt plug, but there are no componants in the rv that are connected across both legs at the same time. So technically its really two 120 legs that share ground and neutral...
SO you can actually plug it into to 220 volts where each leg is 120 and out of phase with the other leg, or.. you can plug it in to two 120 circuits that are in phase, but each side or leg is rated for 50 amps. Be aware that the neutral will have to carry 100 amps if the two legs are in phase, and almost zero current at max current load if the circuits are out of phase...as the two "out of phase" circuits cancel each other out on the neutral. Now wrap your mind around that.
RedGreenGuy
Member
Get on google to see how the outlet at the power source should be wired. Don't plug to 220 and fry all your appliances.
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