Sizing the service for a Commercial Boat Dock

[Gio]

I have been asked to wire eight boat slips for a proposed addition on a commercial boat dock. I currently perform all electrical maintenance and electrical installations for this fairly large operation (aprox. 200 slips now exist).

The eight new slips will be built for large day cruiser type boats that often are equipped with a 50 amp multi-line circuit, the same system as a typical large RV. I am unsure just what calculations and reductions to use to size the distribution panel for these slips. Any suggestions? The marina is on a large fresh water lake in the Midwest, and it is controlled, regulated and inspected through the Corp of Engineers.

This is my first post, I hope I've been clear enough. Thanks, Gio

 

[iwire]

Welcome to the forum, and your question is clear.

You will want to look at 555.12 and ask some more questions. :smile:

 

[haskindm]

Also read the FPN to 555.12 which tells you that if you use the allowable demand factors and you are in an area that gets cold or hot, the installation may not be adequate. Of course 90.1 tels you about the same thing. It is interesting that they effectively increased the demand that you could use a few years ago and then tell you that if you use it you will probably have an inadequate installation.