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Dev Test QAS

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re: Is there a pigtail I should use for this 4-prong 240v outlet to use with a 120v?

Posted by Dev Test QAS on 10/10/16 at 9:42 am to Jj283
quote:
Only place I've seen that style plug is on a generator.


You're probably on to something there, since the breaker is labeled "generator".

I was expecting not to find any amperage on the outlet because I figured it back feeds into the panel. I was kind of (pleasantly) surprised to say the least, because currently the house is flooded out and I wouldn't mind having an RV hookup anyway.

Is it possible it was originally wired for a generator and then was later modified to provide power service to something? I don't see an interlock on the panel. I was hoping this would be an easy thing to google my way though (and save money), but I may have to hold off until I can get an electrician out.

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Is there a pigtail I should use for this 4-prong 240v outlet to use with a 120v?

Posted by Dev Test QAS on 10/9/16 at 5:17 pm
From what I understand, these 4-prong receptacles are really two 120v lines, with one hot wire for the 120v on each phase on the breaker box. I put the volt meter in there and it is 120v in two of the holes, so that bit of information seems to be confirmed.

My question is, how common are these and what adapter, if any, do you use to plug in a travel trailer that has 30amp 120v service? The plug on the TT is 3-prong, of course.

Here's a pic of the outlet:
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