"Peter Bennett" wrote

According to the ABYC standards, there should be no electrical
connection between his two power inlets.

My BlueSea dual 30A AC panel has slides that prevent combining the busses if
both source breakers are on. A Y adapter does essentially the same thing.
The current is split between two conductors but there is only one source
from dock side. The risk is that if he is running his A/C, refer, battery
charger and water heater at the same time the dock pedestal breaker is going
to blow.

I agree though that this is the marina operator's problem and somebody needs
to stay on him until he resolves it.

--
Glenn Ashmore

I'm building a 45' cutter in strip/composite. Watch my progress (or lack
there of) at: http://www.rutuonline.com
Shameless Commercial Division: http://www.spade-anchor-us.com