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Old 01-02-2016, 08:08 PM   #11
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I don't know. Plugging a 15 amp cord into a 30 amp outlet sounds a lot like plugging a 30 amp cord into 50 amp outlet to me. But maybe not.
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Old 01-02-2016, 08:17 PM   #12
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I don't know. Plugging a 15 amp cord into a 30 amp outlet sounds a lot like plugging a 30 amp cord into 50 amp outlet to me. But maybe not.
I use a 50/30 dog bone at the 5W, a 30 amp extension cord, to a 30/20 dog bone to a storage building for power when not camping. Runs everything inside except A/C and batteries are always full.
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Old 01-03-2016, 11:40 AM   #13
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I don't know. Plugging a 15 amp cord into a 30 amp outlet sounds a lot like plugging a 30 amp cord into 50 amp outlet to me. But maybe not.
Not the same at all.

Plugging a 30 amp Travel Trailer into a 50 amp supply is safe. The modern TT power panel has a 30 amp main breaker. That means that the 30 amp cord to the TT can never be overloaded.

In power distribution there is a 10 foot tap rule for supplying power off a distribution bus. That rule allows a tap which is not sized for the main bus overcurrent protection to be used to supply a switch or breaker which has proper level of protection. The theory being that the tap conductors cannot be overloaded. I look at a 50 to 30 amp adapter for a TT with main breaker protection as being a similar situation.


Plugging an unprotected 30 amp cord into a 50 amp supply (not a TT situation) does have the danger of possible overload on the 30 amp rated cord. The 50 amp breaker would protect the 30 amp cord in the event of a dead short, but could allow long time overcurrent to overheat the cord.

A 15 amp cord fed by a 30 amp adapter does not have proper overcurrent protection. The small cord can easily be overloaded. The 30 amp protection allows 100% overload on the 15 amp cord. It also lacks GFCI protection as I mentioned in my previous post.

FWIW vic
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Old 01-04-2016, 10:09 AM   #14
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Do you want to do this for extra power in the trailer? For extended stays in the camper I ran a heavy extension from the post's duplex receptical along side the 30 amp cord right into the camper. DW wasn't happy with the the damage to her Feng Shui, (a lie) but did appreciate being able to run the toaster oven without worrying about the AC or microwave.
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Old 01-04-2016, 12:56 PM   #15
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I have never seen what you describe available commercially. That may tell you something!
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Old 01-04-2016, 01:34 PM   #16
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Let's see having 30A available to a cord that will fail when more than 15A is passed through it?


I'd say do not purchase nor build anything like it!


Besides, when the RV is plugged into the 30A pedestal, there are 15A sockets on the outside of the RV. Use one of them and you'll have the 15A breaker protecting the extension cord. Let's be safe out there.
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Old 01-04-2016, 02:46 PM   #17
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That's what a number of us are saying. Its dangerous, don't do it!
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