Comodave
Moderator Emeritus
- Joined
- Jul 2, 2015
- Messages
- 22,037
- Location
- Au Gres, MI
- Vessel Name
- Black Dog
- Vessel Make
- Formula 41PC
My understanding - based on a 2019 club cruise to a brand new marina, two nights of 90+ degree weather with no dock power - is that the limit on a slip GFI is now 30 ma and the entire branch/dock is 100ma. Many/most boats will be ok w the 30 ma limit, but many/most combinations of boats will trip the 100ma GFI. On my 2007 Mainship, had to replace the galvanic isolator and fix a couple of wiring issues. Done by marine electrician. Fortunately done the prior year to address issue at home slip, so I wasn't part of the problem.
I am reasonably competent with household wiring. I do not work on boat 120V wiring. Complexities of shore power, generator, inverter, grounding, etc. And the risk is too large - even if everyone on the boat is safe, you risk anyone in the water. Hire a marine electrician if you are not expert and experienced.
There is 2 ways they are wiring docks. Either at the slip with 30 mAmp breaker or the whole dock with 100 mAmp breaker. It isn’t a combination of both. It is one or the other.