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#41410 - 08/25/04 07:42 PM Motor Home Wiring?
aldav53 Offline
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Registered: 08/22/01
Posts: 545
Loc: Chandler, AZ USA
I looked at a large Motor Home a customer wants power to. It has a 6-3 w/grd 50a 240v cord on it. I checked the continuity from neutral to ground and no connection. He said he plugs it in to a camp ground with a 3 prong adaptor and it works (2 prong with ground). How would this work if there is no connection to neutral at the motor home panel. And the adaptor has no connection between nuetral to ground on the plug itself. Is there something different about how a motor home is wired?
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#41411 - 08/25/04 09:21 PM Re: Motor Home Wiring?
NORCAL Offline
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Registered: 09/25/02
Posts: 865
The neutral and ground are isolated in the panel.
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#41412 - 08/25/04 09:45 PM Re: Motor Home Wiring?
aldav53 Offline
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Registered: 08/22/01
Posts: 545
Loc: Chandler, AZ USA
But then why would it work when he plugged it in at the camp park? Theoreticly there would be no connection for the neutral.
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#41413 - 08/25/04 10:18 PM Re: Motor Home Wiring?
caselec Offline
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Registered: 04/14/02
Posts: 558
Loc: San Jose, CA
The 3-wire to 4- wire adapter plugs into a 125 volt 3-wire receptacle. It connects L1 and L2 of the motor home together so all 120 volt electrical items will function but you will be limited on how many items that can be used at the same time.

Curt
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#41414 - 08/25/04 10:22 PM Re: Motor Home Wiring?
aldav53 Offline
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Registered: 08/22/01
Posts: 545
Loc: Chandler, AZ USA
Then how would his 240v A/C work? Something doesn't make sense.
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#41415 - 08/26/04 05:31 AM Re: Motor Home Wiring?
NORCAL Offline
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Registered: 09/25/02
Posts: 865
There are no 240V loads in the motorhome* the adapter jumpers both hots so it can be used for 30A 120V service.

* At least in any that I have seen.
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#41416 - 08/26/04 09:36 AM Re: Motor Home Wiring?
aldav53 Offline
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Registered: 08/22/01
Posts: 545
Loc: Chandler, AZ USA
Yes, that makes sense, I do remember campers being about the only 120v 30a service. The customer said it was 240v, but that is wrong.
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#41417 - 08/26/04 10:12 AM Re: Motor Home Wiring?
aldav53 Offline
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Registered: 08/22/01
Posts: 545
Loc: Chandler, AZ USA
Another thought:
The motor home has a 4 prong 240v 50a cord & plug. Without the adaptor, someone could could plug that into a 240v outlet and smoke the MH.
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#41418 - 08/26/04 03:15 PM Re: Motor Home Wiring?
hbiss Offline
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Registered: 12/16/03
Posts: 886
Loc: Hawthorne, NY USA
Why would that be a problem? Isn't there 2 hots, neutral and ground at the plug?

-Hal
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#41419 - 08/26/04 03:56 PM Re: Motor Home Wiring?
aldav53 Offline
Member
Registered: 08/22/01
Posts: 545
Loc: Chandler, AZ USA
hbiss, No there isn't, as I said early there is an adaptor changing it to a 3 prong.
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