Feeder Conversion

[Electron_Sam78]

I've got a job where a bathroom building was demolished but it was sub-feeding a picninc shelter. I need to splice the feeder from the demolished building into the shelter feeder to get it powered back up. The original bathroom's feeder was 3 wire - no EGC and the sub fed shelter is 4 wire. Should I install a 2 pole GFCI CB at the supply to account for the now missing EGC to the shelter or should I convert one hot leg to an EGC and make the shelter a 120V load but also lower the available current to less than 20 amps due to voltage drop (it's about a 700 ft run in #2 Cu then spliced into #2 Al for the last 310 ft)? The shelter has 4 receptacles (split into 2 circuits on separate legs) and 2 light outlets but it's known to be overloaded due to fryers being hooked up and such so I need as much available ampacity as possible but I also want it as safe as possible according to code. That's my dilema. I'd appreciate any input. Thanks

 

[cpal]

will you construct a a structure (back board ) to support the sw gear to feed the shelter??

 

[Electron_Sam78]

no, I won't do anything but splice and replace the supply ocpd. Everything else is in place -existing.

 

[LarryFine]

I'd start with "What was the fourth conductor in the second run doing?"

You can either make it all 3-wire or all 4-wire. It sounds like you need to keep it bigger than 20a, and at 240v.

 

[Electron_Sam78]

That's what I was leaning towards but just wanted to hear some feedback from the forum.