marina

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sleepy

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i am designing power to a marina, i know the section in the nec is 555, and its very important to have the grounding correct because it is life threatning.
i would think if we have the right ground, gfci receptacle at each station, probably a approved signal/monitoring(continuous) devise, and having the yachts grounded.

any other thing that might help
thanks
 
Marina

Marina

is their anything special power wise that you are doing desided the above things, gfi, wp recept. because of salt walter any thing else, monitor
thanks sleepy
 
Pay very close attention to your voltage drop calculations. I cannot emphasis this enough. Pay very close attention to your voltage drop calculations. Look at Hard working's marina. See the U shaped dock on the right, LOOOOOONNNNNG run from shore. Probably have 1 or 2 substations out on the piers to service the pedestals the 240V.

Use the demand factors and take the extra 10% credit for individual KWH meters at each slip. This will help in reducing the conductor sizes. But go too small and then Mister 60 foot yacht calls the dockmaster when his AC units trips or burns up because there is only 198 volts at his boat.

The GFI receptacle is easy enough, just specify it to be integral to the power pedestal.

Get with the pedestal manufacturer and pick their brain about how their unit should be specified and the way it will be built.

Good luck!!!!!
 
Hurricanes

Hurricanes

I been thru many hurricanes with my North Carolina based boat. I wish someone would come up with the proper design to feed shore power to all these floating docks correctly.
 
RUwired,
Whose floating docks?

Were they concrete, or aluminum or wood? I know for a fact that the big concrete dock manufacturing companys have structural engineers calculating the pilings and floats. I have had to send the substation, wiring and pedestal information to them once I designed my portion so they can make sure all of the bases are covered. Check if the marina is designed for hurricanes as occupied or unoccupied also.

Random marina note: A marina here has just replaced all of their THWN with W cable becasue of the insulation failing on the breakwater sections where subjected to small wave action.
 
Boater Bill,
Can you explain "W" cable? Do you mean SOOW or SOW ect? I have a floating dock coming up in fresh water that cannot be hard piped. I was hoping to use SOW under the bridge and dock to a j-box, then EMT on the dock itself......thanks John
 
W cable is an industrial grade portable power cable. Ozone, oil, sunlight, and water resistant. High conductor count and real large diameter because of the insulation. It is very flexible and hard to pull through pipes but can be run exposed. The outer jacket is almost like rubber. The cut sheet I have is from American Insulated Wire Corp but I am having trouble pasting a link.

I hope this helps.
 
"W" Cable

"W" Cable

W -cable is not approved for this application. It is usually deemed or used in the welding industry and does not have the qualification for direct or indirect submersion. The key words here are wet location/direct continuos submersion.
 
There's welding cable and there's Type W (usage: "portable, extra hard usage", 2002 table 400.4), they're vastly different. Since I'm looking: 400.7(A)10 and 555.13 (A) (2) "Where flexibility is necessary as on piers composed of floating sections"

Void where prohibited, your codes may be different :)
 
marinas

marinas

Lou,
On some of the precast concrete docks I've seen, they have non-metallic raceway built into the dock with handholes etc., however, the ones I've encountered have inadequate capacity by the time you size your W cable for voltage drop, etc.. Have you found this to be a problem?

augie
 
augie47 said:
Lou,
On some of the precast concrete docks I've seen, they have non-metallic raceway built into the dock with handholes etc., however, the ones I've encountered have inadequate capacity by the time you size your W cable for voltage drop, etc.. Have you found this to be a problem?

augie
Click to expand...

I've not had the pleasure (or aggravation) of wiring a concrete dock yet. The manufacturer I'm supporting builds wooden docks.

I've often wondered how those conduits in the concrete dock get sized. I've also seen a concrete dock that was retro fitted. Wiring had now where to be installed so whoever did it put it underwater (type W cable).
 
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