RV camper pedestals (new to this type of install)

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Husker Sparky

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Have a family member who just purchased private land around a large public lake and is in the process of building a camper shed with covered deck and small living quarters that will have to install 100 amp main breaker panel for. The land has 4 camper pedestals that are spread far apart That are fed off of a 200 amp metered disconnect. I know I should come off the service feed and oversize wires as it is about 300’ to panel but he doesn’t want to trench that far because of all the buried lines and sewer piping that are in the ground around there. My question is can I tap off of the third pedestal that are paralleled with 250 kcmil aluminum as this would make it a 20’ run to the panel, I think you must count each pedestal at 40 amps but they won’t ever be pulling that much at once. He’s set on this idea and can’t talk him out of it , anyone Have any suggestions

Thanks
 
Need to know a couple things,
What is the largest sized receptacle found in the pedestals, are they all the same or some combination of,
then we can look at article 551 to see what the load calculation is and the demand factor involved to see if you can add the 100 amp panel.

also I don’t believe you have 250 mcm paralleled, what you are seeing is a loop feed in and out of the pedestal? ( from one to the next )
 
Thanks Steve

Yes your right it is a loop feed to each pedestal that are all the same with a 240 v 50 a and 120 v 30 a and 120 v 20 a that supplies a GFCI receptacle based on article 551 using 9600 va’s and with 4 sites being the demand factor at 75% I got 28,800 va’s which comes out to 120 amps total so would the 100 amp panel be too much as I know it won’t ever pull that much or would it be ok to install it any replies would help
Thanks
 
Uh-oh depending on which code cycle your using that 9600va may not be applicable as it was changed to 12,000va in the 2017 cycle.

12,000 va x 4sites = 48,000va
48,000va x demand 75%= 36,000va
36,000va / 240 volts= 150 amp

Can you put in a 100 amp ML panel and just feed and install say an 50amp main breaker?
What all is intended for this building to power?
 
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Ya thanks i did see the change in 17 now it should be fine on 50 amp main as it will just have 4 20 amp circuits one for lighting and three for regular branch circuit receptacles I guess he’s not gonna go with the living quarters so that should work I’ll check with the inspector out there to see what he thinks but thanks for the input
 
You might want to check with the pedestal manufacturer as to whether the pedestal is rated for you adding another conductor (unless you are adding to the dead end, but it sounded like you were picking up the feeder at a pedestal that has a feed in and feed out existing).
 
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