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Joined: Jan 2003
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It will not smoke anything.
Bob Badger
Construction & Maintenance Electrician
Massachusetts
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Joined: Aug 2001
Posts: 545
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iwire, what do you mean it will not smoke anything. If the MH is all 120v and you plug into a 240v 4 prong (on the Motor Home cord & plug). ??
The Golden Rule - "The man with the gold makes the rule"
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Joined: Dec 2003
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Because it is wired for 120/240 although there are no 240 volt loads.
-Hal
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Joined: Feb 2004
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I know an electrician that is getting ready to do a job like this , he talked to the camper dealer and they said that some of the bigger motor homes & campers had 2 A/c units , so they had to go to the 50 amp 240 volt ,, 1 phase runs the motor home and 1 A/C unit the other phase just operates the second A/C unit
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Joined: Aug 2001
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Lane, exactly what I thought, but will do some further checking.
The Golden Rule - "The man with the gold makes the rule"
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Joined: Jul 2003
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4 wire 50 amp service is common to motorhomes. It is designed for standard residential configuration 120/240. There are typically no 240 volt loads so the system can be used with one of the many adapters on almost any 30 or 15 amp recepticle (with the adapters in place, both hots are tied together so there is 120v for all the loads and 0 across L1 and L2). The panel in the motorhome is wired like a standard subpanel with neutral and ground isolated. I'm not sure when the trend started but I have a '77 model with the 50 amp service and that manufacturer was using it in the early 70's.
Just think residential subpanel and you have a picture of most of it.
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Joined: Aug 2001
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So on the 3 prong adaptor, the 2 hots coming from the MH are tied together on one side, and the other side must be tied to the neutral and center ground.
So the 2 A/C's have to be 120v with one using one leg and the other using the other leg. Correct?
That could put a large load on the neutral when using the adaptor (plugged into 120v) if everything was turned on in the MH.
The Golden Rule - "The man with the gold makes the rule"
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Joined: Dec 2003
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Right but with the adapter plug the receptacle is OCP'd at 30 amps. Turn everything on and the breaker trips.
-Hal
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