hardworker
Senior Member
What does code say about using #3 awg copper for the hots, #3 awg copper for neutral and # 8 awg copper for ground on a 135 ft run between the main and this 100 amp subpanel?
AWG code for 100amp subpanel
- Thread starter hardworker
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Cow
Senior Member
- Location
- Eastern Oregon
- Occupation
- Electrician
Sounds fine to me.
Volta
Senior Member
- Location
- Columbus, Ohio
As long as you satisfy 110.10, and the terminations are rated 75 deg C, all voltage drop considerations aside, it sounds ok to me.
- Occupation
- Licensed Electrician
Sounds ok. What are your concerns?
- Location
- New Jersey
- Occupation
- Journeyman Electrician
With 75? C terminations the NEC says that your installation is code compliant. Is someone saying otherwise?
petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- Semi-retired engineer
can't say there is anything "wrong" with it code wise.
might have VD issues at high usage times.
presumably you have done a load calculation and this installation is adequate to support that.
is the main 100A as well?
- Location
- Illinois
- Occupation
- retired electrician
That would be the case assuming a 100% unbalanced load. With a balanced load and or line to line loads the current can go up will out exceeding the voltage drop recommendations.
hardworker
Senior Member
The main is a 200amp panel. The building owner was worried about voltage drop on the 135 run. The 100amp sub will never pull more than 70amp.
You can go here and play with the numbers....
http://www.mikeholt.com/documents/freestuff/other/VoltageDropCalculator.xls
http://www.mikeholt.com/documents/freestuff/other/VoltageDropCalculator.xls
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