Originally Posted by Batman_777
Connecting or Disconnecting the RV to the shore power without ensuring the park breaker is OFF can fry everything in your RV.
The reason for this is due to the connection points on the plug not all connecting or disconnecting at the same simultaneous exact time.
This only applies to the 50 amp RV receptacles, if the "hots" make connection before the "neutral", unbalanced voltage can fry your electronics. With the 30 amp 120 volt RV receptacles, the "neutral" is not shared with a opposite power leg, so simultaneous connection is not critical. The ground pin is longer on both 50 and 30 amp receptacles so it always connects first. Checking the voltage at the pedestal is a good idea though, many rural campgrounds are have undersized/incorrect wiring.