Rv Park Pedestools

[Jayroll]

The setup is :

6 rv park pedestools

one 200 amp breaker

below 200 amp breaker a gutter and out of it comes 2 feeders one for site 1-3 with a total length of 200' and one to feed sites 4,5,6 with a total length of 350'
All 50/30/20 pedstools

question is if you apply voltage drop calc to where you decrease in size the further you go and wind up with a wire size that is rated less than 200 amps is that legal ?
Say for instance the last pedestool should never pull more than 50 amps but the OCD on that wire would be 350' away and a 200 amp breaker

 

[Dennis Alwon]

You cannot protect a wire with a larger overcurrent protective device than the conductor is allowed unless it is covered in 240.4(b). In your case, I am guessing it is not allowed

 

[iwire]

question is if you apply voltage drop calc to where you decrease in size the further you go and wind up with a wire size that is rated less than 200 amps is that legal ?

In general no.

Say for instance the last pedestool should never pull more than 50 amps but the OCD on that wire would be 350' away and a 200 amp breaker

You might be able to do that using the outside tap rules in 240.21

I would not, keep in mind the NEC is the bare minimum allowed for safety and installing based on the bare minimum may result in very unhappy customers.

The code even tells us that right at the start of it.

90.1 Purpose.

(B) Adequacy. This Code contains provisions that are considered
necessary for safety. Compliance therewith and
proper maintenance results in an installation that is essentially
free from hazard but not necessarily efficient, convenient,
or adequate for good service or future expansion of
electrical use.

 

[augie47]

Likewise, I can't see it being allowed. 240.21(B)(5) is the closest rule that might allow the reduction but it requires termination in a single over-current device.

 

[iwire]

Likewise, I can't see it being allowed. 240.21(B)(5) is the closest rule that might allow the reduction but it requires termination in a single over-current device.

Yeah, that would be an issue with a typical RV pedestal like the OP describes.

 

[Jayroll]

thanks

thanks

Yeah, that would be an issue with a typical RV pedestal like the OP describes.

that was my understanding as well i just didnt know if there was some exception that i didnt know aboit for rv parks cause it seems that that is the way that many are being done

so as far as it goes the smallest wire woulf be a 4/0 alum able to be used
in between pedestools plus the VD & load of the additive load from pedestool to pedestool wouod change to bigger wire closer to the tap can