660ft dock help

M

Moosifer

Member
Location
Panama City Beach, FL
Any advice on getting power out there?
Residential & salt water 660ft from meter.

2x 3/4hp lift motors (15a 240v) for one lift plus 30a of 120v for battery charger, etc.

Subpanel will be on new fixed non-floating dock with expansion joints in conduit 12" or more above electrical datum line.

Equipment type gfci (gfpe) on shore, quicker trip gfci's on dock.

1. Thoughts on aluminum wire vs copper wire.
2. Thoughts on aluminum wire with copper ground vs copper wire.
3. Thoughts on 480v transformers and smaller wire. Copper or aluminum.

Any help would be appreciated. I have been in some newer commercial dock transformer / distribution panels to replace & correct circuits that were installed with splices below the dock and it looks like there is a lot going on in those panels. So maybe transformers are not cost effective vs bigger wire.
 
There does not appear to be a large enough load to warrant transformers.
Locally the guys would likely use Type W cable (Cu) rather than mess with conduit & expansion joints,
 
I would pull direct burial AL conductors for your shore power panel and protect the panel with a GFCI breaker. Then use Carflex with PVC Clic straps and stainless screws for your branch circuits
 
Rick 0920 said:
I would pull direct burial AL conductors for your shore power panel and protect the panel with a GFCI breaker. Then use Carflex with PVC Clic straps and stainless screws for your branch circuits
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No corrosion issues with AL ground vs CU in a semi salt water bay? I thought I saw something about shielded copper ground but that may just be for lake of the Ozarks or somewhere else nowhere near the Florida panhandle.
 
augie47 said:
There does not appear to be a large enough load to warrant transformers.
Locally the guys would likely use Type W cable (Cu) rather than mess with conduit & expansion joints,
Click to expand...
Just curious, how would Type W cable (Art. 400) be acceptable as fixed wiring on a dock?

Thanks,

Mark
 
augie47 said:
See 555.13
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Thanks. Learn something new every day. I had missed 400.7(10) which says, "Where specifically permitted elsewhere in this Code". It would have been nice if they had given a listing of the other Articles which permit that usage, kind of like what they do in Table 240.3.

Mark
 
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