A Hockey Puck 15/30Amp Adapter to Avoid

It's not necessarily due to capacitance but the voltage gradient that exists between the high voltage line itself and the ground. If you walk under a utility high voltage transmission line at 230KV or higher, you can take a voltmeter and put one probe in the ground and one in the air and get a reading and the higher in the air you hold a probe, the higher the reading gets. There's an off-leash dog park near us under a 500KV line and you can't walk your dog with a metal leash otherwise you will get a nasty tingling and that's just a couple of feet off the ground. I don't think I'd want to park an RV near one of these lines.

Harvard wrote:

Dutch_12078 wrote:
The safety ground lug should never carry any significant current unless there's a fault elsewhere. A "hot skin" condition only occurs if the neutral and ground are bonded in the RV in violation of the NEC or shorted together, AND the power source hot and neutral are reversed. Just the absence of the ground alone should not cause any problems, although it's certainly not advised to leave it that way in case a fault should occur.

Not so, there is stray capacitance between the H, N and G conductors through out the RV. When the G is allowed to float it will attempt to find a stable level 1/2 way between H and N or some where < 55 VAC. But the extent of current behind this voltage is in the order of being < 5 milliAmps otherwise it would trip GFCIs if there was a GFCI supplying the RV.

Also, quite separate from the presence of 120VAC H and a N circuit wiring, if you park an RV under HIGH VOLTAGE distribution wires (ie 6,000 VAC) and the RV IS NOT CONNECTED to Shore Power AND the RV has no conductive connection to EARTH, that RV frame will develop a hot skin. This type of hot skin is due to the RV being an isolated capacitator plate between the high voltage wire and EARTH.

IMHO.