Originally Posted by mjones12
A couple of the above posts seem to disagree, so I'm confused. My question is: If I use a 50-to-30 dogbone and then plug my 30 amp PI surge protector into the 30-amp end and then plug in my 30-amp camper, will I be getting just 25 amps?
If I am understanding your question correct, you are wanting to use the dogbone to plug your 30 amp travel trailer and surge protector into a 50 amp campground outlet? I prefer to call a 50 amp service a 50 amp x2 service for everyone to understand. You will have two legs (L1 and L2), each capable of 50 amps of 120 volts at the pedestal. They are controlled by a double pole circuit breaker which controls TWO 50 amp legs.
If this is true and that's how you are connecting, then the dogbone will only use one leg (ex L1) of the 50 amp (x2) service. You will have 50 amps available out of the campground pedestal on that one leg to the surge protector and all the way to your electrical box inside your RV, where there the RV's MAIN 30 amp breaker will control/protect the circuits.
As long as you stay within the same usage as you always do when just using 30 amp service, you are fine...and even if you did overload, then most likely the RV's main 30 amp circuit breaker is going to trip.
The only weak point you could have is the 30 amp power cord from your trailer to the 50 amp outlet, but this is going to be a miniscule problem, if any.Your RV's main 30 amp circuit breaker hopefully will trip, before damage is done to the power cord. As long as you stay within the normal parameters of your 30 amp usage, you will be fine.
I use a dogbone like you are referring to many times, as many campgrounds 30 amp outlets are loose, wore out, or faulty. I hook the dogbone up, then connect my 30 amp RV to the pedestals 50 amp x2 outlet.
Edit: I found this site that explains the various adapters and has schematics of how they are wired internally.