Need expert advice about disconnect DIY

Soundside · Dec 15, 2021

Hi all, I'm a newb, hope I'm in the right spot. I've done a good deal of basic wiring over the years (lots of home renovations and such) and am trained in HVAC, but I'm not an electrician. I have a DIY project - installing power to a dock. I'm drinking from a fire hose and trying to learn about the specifics for this application.
The feeder is from my house panel (220, 50 amp). The dock will have a sub panel. I'm required to have a disconnect where the dock meets shore. Two questions about the disconnect. First, does it need to break neutral? It seems "safer" to me if it does, but I can't find that detail. Secondly, could I use an enclosed rotary switch for the disconnect (the type used as a motor starter). If not, why not? Maybe a better way to word the question is what are the specific requirements for the disconnect for this application?
Thanks!

Timbo · Dec 15, 2021

USA alert. One for @Megawatt

Megawatt · Dec 15, 2021

Soundside said:
Hi all, I'm a newb, hope I'm in the right spot. I've done a good deal of basic wiring over the years (lots of home renovations and such) and am trained in HVAC, but I'm not an electrician. I have a DIY project - installing power to a dock. I'm drinking from a fire hose and trying to learn about the specifics for this application.
The feeder is from my house panel (220, 50 amp). The dock will have a sub panel. I'm required to have a disconnect where the dock meets shore. Two questions about the disconnect. First, does it need to break neutral? It seems "safer" to me if it does, but I can't find that detail. Secondly, could I use an enclosed rotary switch for the disconnect (the type used as a motor starter). If not, why not? Maybe a better way to word the question is what are the specific requirements for the disconnect for this application?
Thanks!

According to article 555.4 of the 2020 edition of the NEC states, The service for a floating building, dock, or marina shall be located on the land adjacent to the structure served, but not on or in the structure itself or any other floating structure. I don’t see a problem with the rotary switch as long as it is NEMA 3 which is approved for outdoor use and wet locations. No it does not to break the neutral.