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Joined: Feb 2008
Posts: 193
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Our church is wanting to put in some 50 and 30amp outlets for RVs. We have singing groups that bring their large busses and need a hookup so they don't have to run their gens for 2-3 days.
The panels are 208/120 and I need 120/240. Can I use the 208v to operate these outlets or do I need to change it to 240. I understand that many 240v motors have run on 208 for years. What's the best thing to do?
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Joined: Jun 2004
Posts: 1,273
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Don't sweat nothing.
The VAST bulk of the true loads are 120VAC...
Only a fraction of the RV load uses two poles: air conditioning in the larger sizes.
So...
Hook up 208Y120 as if it were 240/120 and all will be well.
( No RV uses electric power for hot water at 240VAC, nor do any use electric ranges, etc. )
Tesla
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Joined: Jul 2004
Posts: 9,931 Likes: 34
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Heating elements are not a concern anyway. They just heat less. The AC units are the heavy hitter in an RV.
Maybe a peek at a few RV manufacturer specs would answer the question.
Greg Fretwell
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Joined: Oct 2006
Posts: 745
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I can say with certainty that I've been to many RV parks that use 120/208 Wye services and distribute from there. I really don't think you'll have any trouble at all.
My friend has a motor coach RV that has an electric cooktop in it that only uses a 120 volt circuit, as does the washer/dryer combo. I'm with Tesla: You probably won't see many 240 volt loads, if at all in an RV.
---Ed---
"But the guy at Home Depot said it would work."
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Joined: Mar 2004
Posts: 251
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I have worked on lots of RVs Most all but the very largest (and most expensive) use 120v for everything just divided across 2 ckts a very few use dryers that are 240v and fewer use 240V AC units. Most all rooftop AC units are 120v. I see no problem using 120/208.
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Joined: Dec 2002
Posts: 337
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If you have a handbook look at 2011 NEC 551.40(A). It basically says that equipment be rated 208-230 to allow for 208Y/120 distribution.
Shane
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Posts: 57
Joined: August 2003
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