Marina Load Calculation

[Short Fuse]

I have a new dock that I'm installing 15 power post on, and each post has four 30 amp single pole breakers and a single rec. per breaker.
Each slip get two 30 amp rec. Do I have to supply 120 amp per post 4x30 amp?
Or 30AX120V=3600VA X4=14,400VA divided by 240V= 60 amps?

555.12 gives me a 40% at 60 rec.But this for my service correct?

And voltage drop? dock is 460 feet long.
Installing 120/240 single phase service. only one leg of high voltage coming to site. Any help will be greatly appreciated!!

Thanks

 

[oldsparky52]

Each pedestal will take a 120/240 volt 60-amp source. If the pedestals are metered, you can take an additional 10% reduction. I would probably loop feed 2 pedestals on one circuit to help with VD because you won't be loading up all of the receptacles at the same time (usually).

How do you intend to comply with the GFP requirement?

Is this a floating dock or a fixed pier?

What wiring method do you intend to use?

 

[augie47]

With the longer docks such as you have, the E?Cs here normally try to set a 480/240-120 transformer midway.

 

[oldsparky52]

With the longer docks such as you have, the E?Cs here normally try to set a 480/240-120 transformer midway.

It's been my experience that would not be cost effective for the marina described in the OP.

 

[donaldelectrician]

I have a new dock that I'm installing 15 power post on, and each post has four 30 amp single pole breakers and a single rec. per breaker.
Each slip get two 30 amp rec. Do I have to supply 120 amp per post 4x30 amp?
Or 30AX120V=3600VA X4=14,400VA divided by 240V= 60 amps?

555.12 gives me a 40% at 60 rec.But this for my service correct?

And voltage drop? dock is 460 feet long.
Installing 120/240 single phase service. only one leg of high voltage coming to site. Any help will be greatly appreciated!!

Thanks

Your entire post seems very idiotic . Please recheck your info .

What will cords connect several boats in several slips to one post ?

I have only installed Meter Post per boat slip with 1-50A 2 pole and 30A 2 pole and 1-20A single pole per slip . These slips were for sale or rent .





Don

 

[augie47]

Your entire post seems very idiotic . Please recheck your info .

What will cords connect several boats in several slips to one post ?

I have only installed Meter Post per boat slip with 1-50A 2 pole and 30A 2 pole and 1-20A single pole per slip . These slips were for sale or rent .

Don

I can't see where the NEC requires a 50 amp receptacle. Might not makes sense to some but if the customer wants what the electrician is installing so be it.

 

[donaldelectrician]

I can't see where the NEC requires a 50 amp receptacle. Might not makes sense to some but if the customer wants what the electrician is installing so be it.

The reason for the 50A 240v 2 pole Breaker and recept. , as well as 30 A 240v 2pole , and 120V 20A , is for standard shore to ship power . This we installed in a 360 slip marina 1986 . Each slip had its own power post and was on its own meter . We called these Dockominiums , because you can buy the slip or rent .

These were floating docks with XFMRs and Switch gear on shore , Vutrone marine cable ran in a trough in the center of the dock , feeding each of the power post for each slip .

I do not believe that any municipality would allow ship to shore power cords running all over the dock walkway .
Are these approved plans ?

No I do not believe the owner is always right .



Don