Originally Posted by KC8RXQ
Another good reason to make sure that the pedestal breaker is OFF is that you could draw an arc if your RV's A/C is left on when disconnecting or connecting to the pedestal. There is a high-end surge protector (Progressive???) on the market that has a programmed delay when connecting an energized pedestal to your RV's electrical system not only for this situation but several others as well. Someone else will remember the name but it would be money well spent for the protection it provides.
I think multiple brands have this... I use SurgeGuard - which has an approx 2 min delay when power is applied until it provides it to the coach (assuming no other faults are found that would prevent it).
Primary reason is to not reapply power too quickly to 'compressor' devices (A/C, residential fridge) that might have been on when power went out - as that can damage the compressors...
But it also prevents the arcing when plugging in...
Still always safer to have pedestal breaker off when connecting.