rv park

[rickl]

hi i'm trying to design an addition to a existing rv park, here's the scope of the addition. this addition will be metered seperately from the rest of the park, 10 rv outlets modules ( meter , 20 amp 30 amp & 50 amp receptacles & breakers in each module) & a 15' x 15' bathroom with 50 gallon hot water tank,2 - 2k wall heaters acouple of receptacles & lights. on the outside of the bathroom is were the service will be installed. 6 rv sites on the right side & 4 rv sites on the left
my calc are
10 rv site = 96000 x 50% =48000/ 240= 200 amp
the bathrm is 46 amps
so i'll install a 320 meterbase & feed a 200 amp main breaker panel & a 200 amp disconnect.
the disconnect will feed 6 rv sites =144amp, & the panel will feed 4 rv sites= 120 amps and the bath rm at 46 amp for a total of 164 amps.

here are my questions
the feeders coming off the 200 amp disconnect sized for the calculated load, calculated load at 1.25% or the overcurrent protection.
i think its the calculated load at 1.25% which would be 180 amps & i can use 4/0 alum.
also i would like to use a 200 amp feed thru panel, to feed the other 4 rv sites would those feeders be sized 120 x 1.25= 150 amp or off the 200 amp main breaker
thanks for any help,i'm sure i'll have more questions,

 

[augie47]

calculate the load, choose the appropriate conductor, select the ocp device considering you can go to the next larger size on 800 amps or less.
That said, this being an RV park, if you take voltage drop into consideration, the 4/0 might not be adequate.

 

[rickl]

thanks
the farthest rv site will be about 100' from the service and if i keep the feeders at 4/0 thru out i don't think voltage drop with come into play