Using a higher OCPD on wire sized up for voltage drop

[Electron_Sam78]

I have an RV park where there are 100amp breakers each supplying five 50 amp RV power pedestals. The conductors coming from the 100amp breakers are sized up to account for voltage drop (#2 AWG I believe) due to the long runs or they actually accounted for the amperage draw of 5 sites and didn't account for voltage drop. The 100 amp breakers are inadequate for 5 sites and can trip out when the site has 5 RVs on site utilizing the 50amp receptacles on a 97 degree day. So my question is can I up size the 100a breakers to 150a since the wire size is #2 AWG? See my calculations below:

Per Article 551, 5 50a RV sites at 9600VA each = 48000VA * .65 (demand factor per T551.73) = 31200VA / 240V = 130 Amps

 

[don_resqcapt19]

First #2 is only 115 amp wire. The largest breaker that you could use would be a 125 amp and you can only use that if the load will be 115 amps or less.

 

[Electron_Sam78]

These are USE-2 conductors which according to T310.16 are rated at 130a

 

[iMuse97]

These are USE-2 conductors which according to T310.16 are rated at 130a

You can only use the 75degree column for determining breaker size, which says, 115A max., as stated by Don.

 

[Cow]

Maybe you could dig to the first or second pedestal with larger wire and set another panel?

 

[Electron_Sam78]

You can only use the 75degree column for determining breaker size, which says, 115A max., as stated by Don.

That's good to know! Can you point me to the NEC section that states that?

 

[480sparky]

that's good to know! Can you point me to the nec section that states that?

110.14 (c)(1).

 

[Electron_Sam78]

110.14 (c)(1).

Thanks, I flagged it in my book. Good to know since I'm going to be doing a lot of this in the near future. I've got my NEC, the NEC handbook, and you guys. I really appreciate the input from everyone!

 

[480sparky]

.......I've got my NEC,

That's good!

.....the NEC handbook, .....

That's better!!!!!

.....and you guys. ......

That's......... debatable!

 

[Electron_Sam78]

That's good!



That's better!!!!!



That's......... debatable!

Everyone's a comedian!

I love it