In an extreme case, incorrect wiring could turn your coach frame into a live wire.
Peace
Dave
The trailer frame is the mother of all things electric. What a lot of people don't realize is that "Earth, Ground, White wire, Green wire and frame" are all the same. Should your pedestal power be wired incorrectly...your trailer can become a science project all to easily.
I rewired my old Airstream to 50 amp....changed all the outlets to three prong...split the trailer between 4 breakers...and made provisions for the installation of a washer and dryer.
I completed all the internal work. Jumped out the door...went around and moved the plug from the 30amp to the 50amp outlet. Turned the breakers back on...and went into the trailer with a sense of triumph.
When I grabbed the door handle, I found myself 50 feet away on my dazed butt. My eyes were crossed...and there was a strong smell of burned hair in the breeze.
Went back around...changed the plugs...powered up...and THIS TIME...used my voltmeter to read the voltage between the aluminium to ground...and I mean d-i-r-t. Nothing. Changed over to the 50 amp plug. The time the old voltmeter read 120 volts from frame to ground. A disassembly of the pedestal showed that the 50 amp plug had two hots, no ground, no return. In other words, my trailer was the hot...and my fanny was the ground. Now THAT is a dangerous situation. Also, explained why I initially thought the 50 amp outlet was dead.
I remained on my 30 amp feed until I left the park. A lot of people complained that they had no 50 amp service....wonder why.....
Nothing like a 7200 pound buss. Just remember to keep one (1) of your jacks on dirt so that your time on earth might be long.