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#41410 08/25/04 10:42 PM
Joined: Aug 2001
Posts: 545
A
aldav53 Offline OP
Member
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?


The Golden Rule - "The man with the gold makes the rule"
#41411 08/26/04 12:21 AM
Joined: Sep 2002
Posts: 909
N
Member
The neutral and ground are isolated in the panel.

#41412 08/26/04 12:45 AM
Joined: Aug 2001
Posts: 545
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aldav53 Offline OP
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But then why would it work when he plugged it in at the camp park? Theoreticly there would be no connection for the neutral.


The Golden Rule - "The man with the gold makes the rule"
#41413 08/26/04 01:18 AM
Joined: Apr 2002
Posts: 558
C
Member
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


Curt Swartz
#41414 08/26/04 01:22 AM
Joined: Aug 2001
Posts: 545
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aldav53 Offline OP
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Then how would his 240v A/C work? Something doesn't make sense.


The Golden Rule - "The man with the gold makes the rule"
#41415 08/26/04 08:31 AM
Joined: Sep 2002
Posts: 909
N
Member
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.

#41416 08/26/04 12:36 PM
Joined: Aug 2001
Posts: 545
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aldav53 Offline OP
Member
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.


The Golden Rule - "The man with the gold makes the rule"
#41417 08/26/04 01:12 PM
Joined: Aug 2001
Posts: 545
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aldav53 Offline OP
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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.


The Golden Rule - "The man with the gold makes the rule"
#41418 08/26/04 06:15 PM
Joined: Dec 2003
Posts: 886
H
Member
Why would that be a problem? Isn't there 2 hots, neutral and ground at the plug?

-Hal

#41419 08/26/04 06:56 PM
Joined: Aug 2001
Posts: 545
A
aldav53 Offline OP
Member
hbiss, No there isn't, as I said early there is an adaptor changing it to a 3 prong.


The Golden Rule - "The man with the gold makes the rule"
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