Wiring gage questions
Robert Wilber
Licensed Philadelphia Electrician
Philadelphia License # 3516 - 16765
*
I would humbly suggest that you pull a circuit out there for a receptacle too.
If you have 12 x 100 watt lamps, then you will be pulling 10 amps on the line.
Run a separate circuit for a receptacle as well, and put in a GFI.
120 feet is a 240 foot roundtrip.
the formula for wire size is a corollary of the voltage drop formula.
Voltage drop =KIL/CSA where K is conductance, I is current, L is circuit length and CSA is cross sectional area in circular mils.
so... CSA= KIL/V drop
CSA= 11 [K factor of copper] x I [say 12 amps] x 240 feet / 3 volts
CSA= 11*12*240/3=10,560 circular mils
10 gauge is 10,380 circular mils. Sounds like a good fit.
So, run 240 out on a 10/3 with ground type UF cable out to the stable and put in a 2 circuit loadcenter.
Make sure to isolate the neutral from the ground at this panel.
According to NEC 250.32 it is not required to have a ground rod at the stable. I think having one might create problem ground currents that could interfere with the horses, but get advice from your local inspector and the authority having jurisdiction.
*
I haven't done this myself, so I haven't checked my opinion on this with any "Authority Having Jurisdiction"
This is my interpretation of what I have read in the 2005 NEC
*
LIFE SAFETY WARNING! [disclaimer]
This information is provided for the use of parties as they see fit!
I am not responsible for the application of this information by any party, including those lacking sufficient skill or knowledge to perform these steps safely and any hazard created is the SOLE responsibility of the user.
|
Linear Mode
