Understanding the rating on rv pedestals

[Necnerd]

You need to contact the manufacturer and find out from them what the pass thru lug block is rated for.
I don't see why you couldn't string as many of them as needed along a run, as , long as you keep the over current protection below the pass through block and wire rating. The 125A rating is just for the upper section, wiring and bus section. The lower section is where your pass through ratings apply. Ask the maker what the ratings are for the model you select.

When I used to go RV'ing many large parks had many multiple pedestals on one decent sized feeder, fused back at the office service.

I have talked to them twice now and they have not been much help with the feed through option. They basically can tell me what size wire you can feed through but not the amperage… the only amperage rating I can get out of them is on the meter and the top part that leaves the lugs… this is what I have been trying to figure out for the last couple days… I’ll attach the spec sheet that was posted for the model I wanted to go with

 

[Necnerd]

Specs

 

[Necnerd]

Specs

 

[MTW]

If I understand correctly you would only be able to feed/loop through 3 pedestals fed from a 125a circuit.

Or are you saying you could feed this with a 200a circuit? And loop 4 to 6 sites out?

I don't see why you can't use the feed through lugs on the bottom of the 200A pedestals and place several of them on the same parallel feeder chain. The main 200A overcurrent device being at the supply to the string of pedestals. keep the wire size at 200A for the entire chain, to the last pedestal, them they are all protected at the maximum rating of the feeder.

Each individual pedestal head can have their own circuit protection, depending on what outlets you choose. and that the total connected load does not exceed the 125A rating of the head assembly, feeder wiring and branch circuit bus.

There should be some load diversity as well, because it's very unlikely that all pedestal outlets will be using their maximum capacity simultaneously. Depends on who the customer rents sites to.

You could also confer with your inspector, customer and utility that your design and pedestal selection meets their requirements before ordering.

I used to go river tubing/camping and bring along a 2HP portable compressor to fill up hundreds of truck inner tubes and small rafts for the weekend river float trips and never had a problem with the setup described, and that was along with the needs of another 100 campers on the same weekend. There is normally a big diversity of campers needs, depending on time of day and conditions.

 

[jim dungar]

They basically can tell me what size wire you can feed through but not the amperage… the only amperage rating I can get out of them is on the meter and the top part that leaves the lugs…

Unless there is an internal main breaker, the feed through lugs need to be the same rating as the interior bussing. The NEC and UL tap rules apply.

 

[kwired]

Unless there is an internal main breaker, the feed through lugs need to be the same rating as the interior bussing. The NEC and UL tap rules apply.

Listing possibly could let you have 200 amp bus at the main/feed through terminals and lesser bus beyond that? Helps that it is intended to be somewhat a definite purpose kind of thing and not a generic panelboard that has somewhat unlimited applications it could be used for.

Manufacturer might get it listed that way, but we in field couldn't put together a 200 amp splice box and then directly feed a main lugs panel with 125 amp bus without providing proper overcurrent protection to the bus.

 

[Necnerd]

Thank you guys for all the responses! I think I’m gonna run with the 200amp pedestals and just feed through them with 200amp rated wire.

 

[MTW]

That's the way it appears to me, the feed through lugs is a splice point in the feeder, with a tap point to feed the local buss in the panel.
Tap rules are applied in the panel, the internal buss is right after the tap, and is limited to the 125A with a maximum of six breakers, all grouped together. And the breakers and outlets are factory provided and installed to comply with the tap and protection rules.

Appears to comply with the tap rules as constructed, how else would the product get listed.

Specifications
• UL-listed 125 Amps, 120/240 VAC—1Ø power outlet.
• Short circuit current withstand rating 10,000 RMS symmetrical amperes.
• NEMA 3R welded enclosure for durable outdoor use.
• Enclosure constructed with galvanized 16-gauge steel.
• ANSI 61 gray polyester powder coat finish.
• Convenient concentric knockout configurations and mounting embosses.
• Hub opening with closure plate allows for meter retrofit.
• Wire terminations accept copper or aluminum conductors for loop feed wiring.
• Line: (2) 1/0-#12 Ground: (2) 1/0-#14 and (4) #6-#14 Neutral: (2) 1/0-#14 and (4) #6-#14
• Six circuit plated copper interior accepts standard plug-in type circuit breakers. Rated up to 125 Amps.
• Three position self-grounded receptacle bridge accepts most standard NEMA receptacles with mounting plates.
• Components factory wired with stranded copper wire.
• Lockable hinge cover and deadfront are removable for installation and maintenance. Stay-open hinge cover has safety
interlock on deadfront. Deadfront cover must be removed before hinge cover can be removed.

Please consult serving utility for their requirements prior to ordering or installing, as specifications and approvals vary by
utility, and may require local electrical inspector approval. All installations must be installed by a licensed electrician and must
comply with all national and local codes, laws and regulations. Milbank reserves the right to make changes in specifications
and features shown without notice or obligation.

 

[tortuga]

One way you can do it for your 4 possibly 6 total sites, is 180A feeder ampacity (your calculated load), 200A breaker permitted.
Get pedestals rated for their load, loop your feeder thru a electrical hand hole near each pedestal, install a triple tap mole.
Then use a outdoor feeder tap of unlimited length following the requirements in NEC 240.21(B)(5), to the rv pedestals.
The pedestals then only need to have a main rated for the pedestal.