1000-amp service

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hardworkingstiff

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Wilmington, NC
UG transformer will be mounted 4' above grade at a marina on a platform constructed of pressure treated lumber. Approximately 3' away is a wall built for my panel (1000-amp single-phase) on the same platform. FYI, 5"-15" of water is under the platform at high tide.

The PoCo has agreed to the design so long as the platform under their transformer is enclosed to keep people/things (like gators) away from their wiring feeding the transformer.

The owner instructed the marine contractor to reuse some old pilings, and the pilings did not get installed, as I understood them to be going in. I am paralleling 4-sets of AL. conductors to the main breaker. Here is the challenge. There is a set of pilings between my panel and the transformer. There is no longer a direct shot going down from the panel then over to the transformer and back up (was planning on using PVC conduit). Getting the conduits the same length will require a lot of work and it WILL look ugly. I thought ?I?ll just install LFNC? but my supplier says it stops at 2?, too small. LFMC is out because the lengths will be more than 6?.

Any suggestions are welcomed.

Thanks,
Lou
 
hardworkingstiff said:
LFMC is out because the lengths will be more than 6?.
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Unless there is a specific marina code rule about this you can run as much LFMC as you want as long as you do not use it as the fault path.
 
Don't worry, Bob, we're all wrong once in a while. It even happened to me once: I thought I was wrong about something, but it turned out that I was mistaken. :D

Seriously, Lou (hey, it could happen!), would it be possible to bore through the pilings in order to keep the run straight? You don't mention the conduit size (2.5"? 3"?), but a single slice cut out with a chainsaw might make a slot the four conduits can fit through.

If that would completely sever one piling and let the top fall off, you could cut half of the slot into each of two adjacent pilings, which would leave enough material to keep the upper halves intact and in place.
 
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LarryFine said:
Don't worry, Bob, we're all wrong once in a while.
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I am not worried, although I don't like giving people wrong info.

If the day comes when I convince myself I have all the right answers I have a friend that will punch me in the head until I return to my senses. :D
 
iwire said:
If the day comes when I convince myself I have all the right answers I have a friend that will punch me in the head until I return to my senses. :D
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Now that's a friend!
 
I think I'm going to have to use LB's to exit the back of the panel and then go down through the platform on the other side of the pilings. The pilings are about 12" - 20" from the panel.

The platform is 4' wide by about 13' long. There are two sets of pilings on each end and one set in the middle. The problem is they are centered (about 2" between them) in the length of the platform. 10" (maybe 12") round pilings with a couple of inches between them takes up about 22" in the middle of the platform. The pilings are cut off just below the decking and have headers bolted to them to hold up the frame joists of the platform. The panel is on one side of the center pilings and the transformer on the other. Oh yea, they are going to add posts in the corners and completely enclose the space directly below the platform.

I was planning on running (3 for copper and 4 for aluminum) 3" PVC between the panel and transformer.

I'm thinking I might want to go to schedule 80 in the 3.5" size. Do they make a schedule 80 LB?
 
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