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Old 11-20-2013, 12:57 PM   #29
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Originally Posted by Ray,IN View Post
IF it is wired according to the instructions in the link 007 provided, yes a 240VAC welder may be used from the same receptacle as the RV. The 4-prong plug/receptacle and wiring is identical. (again, read that link)

All RV's equipped with 50A service have identical (240VAC) wiring until it reaches the RV breaker panel, where the internal design of the bus bars prevent bridging them with a breaker to obtain 240VAC; with the exception of total electric MH's. They do have 240VAC available for appliances.
Not with a typical 50 amp welder hook up! Most 50 amp 240 v welders use a variation of 3 prongs. If an electrician puts in your RV 50 amp outlet, make sure they know what they are doing. After they are done, take a multimeter and measure the power. In the following diagram, between
B and C = 240 v
B and D = 120 v
C and D = 120 v

Any other voltages would show a miss-wired outlet. It is critical to your RV's electronic health that you check before plugging in.

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Old 11-20-2013, 02:54 PM   #30
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Agree totally--if you use 2-pole 30 amps breakers, you get the benefit of 60 amps vs just 30 with a single pole and a 30 amp RV plug. Think the group think here has concluded that 50 amp 2-pole is the best solution, if you are going to go to the effort and you have a 100 amp source in the barn/shed/garage. But given the anal retentive nature of electrical codes, I still suspect the "book" would discourage connecting a 30 amp 2-pole to #10s and then to a 50 amp plug--just saying.
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Old 11-20-2013, 07:00 PM   #31
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50 amp vs 30 amp

Just had a 50 amp installed in the garage in front of where the coach is parked. I was plugged into a 15 amp receptacle and tripping the breaker. I put in a 50 amp receptacle . Learned a lesson!
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Old 11-21-2013, 04:14 PM   #32
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Advantage 50 amp: (Or a 50 amp outlet with 30 amp breakers)

Most all electricians understand the 4 wire 50 amp plug and how to wire it up. Odds of a screw up low.

30 amp: Many electricans screw it up and .. hundreds or more in damage to your RV's electronics happens in the blink of a 240 volt eye.
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