Wednesday, November 30, 2022


When and when not to use “dog bone” adapters


Dear Gary,
gary-736Thanks for your information at the recent RV show. Your seminars were very informative and those tire pressure requirements were new to me. Also you mentioned that the dog bone adapter is a not a good idea. I’ve used them for years with no problem. How can I plug my 50-amp trailer to the 30-amp post at the campground without one? What do you know that I don’t? —Thomas S.

Dear Thomas,
Thanks for coming to the seminars, Thomas! Glad to hear you liked them! About those dog bone adapters … only use them if you absolutely have to. The biggest concern is that one or more safety devices are bypassed when using them. Plus more connections in the chain gives moisture intrusion and electrical corrosion a leg up. But if all you have available is a 30-amp receptacle, unfortunately you’ve got to use one.

Try to always plug in to the correct receptacle so you can have full operation of all your components and circuit protection. Here’s an industry expert’s similar remarks about those dog bone, reducing electrical adapters. Check out this short video


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Gene Bjerke
6 years ago

“Plus more connections in the chain gives moisture intrusion and electrical corrosion a leg up.” I have made a flexible plastic “tube” by cutting the bottom off two plastic storage bags and taping them together. Any time I have an electrical connection where the weather can get at it, I slip a tube over the joint and secure the ends to the cable tightly with heavy string wrapped around everything. Cheap and effective.

Tommy Molnar
6 years ago

We were recently in an RV park where our 30 amp hookup turned out to only be supplying 100 volts – at best. I plugged in my 50 amp to 30 amp converter plug, rechecked the voltage and found that I could now get 125 volts. I left us plugged in there for the remainder of the stay. Turns out it was a problem with the county electric company and aging transformers.

6 years ago
Reply to  Tommy Molnar

The problem here is that your wiring from the RV park post to the main breaker in your RV is only sized for 30 amps, but the breaker in the post won’t trip until you exceed 50. If there is a problem with your system, those wires may get hot enough to cause damage or maybe even a fire. Going the other way, plugging a 50 amp cord into a 30 amp circuit, or a 30 amp cord into a 15 or 20 amp circuit, if you aren’t careful to limit your usage, you will trip the 30 amp breaker. One time won’t hurt it, but frequent tripping will wear it out faster.

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