[bbunch]

I’m having trouble with my shore power. My marine just put in new 
Pedestals with the new gfi and I can only run one 30 amp line at a time. If I try to run both 30 amp lines it trips the breakers on the pedestal. Any ideas  on what would cause this??
Thanks, Bill

[Sans Peur]

You have a neutral line crossed to a ground somewhere. Plug both lines in and turn off all breakers. Then slowly turn them back on one at a time. When you trip the GFI on the pedestal then at least you have a direction to look.

[Misdirection]

As mentioned above, either a neutral to ground, OR the neutral bus bars are crossed. The new breakers are essentially GCFI breakers and your showing an imbalance when both are connected.

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