The few times that I have started the generator to exercise it while plugged into shore power has usually resulted in tripping the shore breaker (happens at my house and at the last RV Park I stayed long enough to want to exercise the gen). The last time was a pain since the breaker that tripped wasn’t at the pedestal, it was upstream at the meter bank for this section of the park where I was. I try to remember to always unplug from shore power before starting the generator. I don’t know if plugging in while the generator is already running would cause
the same kind of surge that may trip a shore breaker but I would recommend unloading and shutting down the gen before plugging in.
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