electricguy61
11-02-2007, 11:53 AM
I could use some help on a dillema I'm facing.
I have an old Zinsco commercial distribution panel that uses QFP breakers. I need to install a small sub-panel (70 amps) approximately 100 ft away. The smallest QFB breaker is 125 amps.
Is it code compliant to install #3 THHN from the 125amp breaker to a 70amp breaker at the sub-panel?
One possible work around would be to install a 125amp sub-panel next to the main and then step-down to 70 amps, but this obviously increases the cost quite a bit.
Please site the applicable code(s)
Thanks for the help
I'm going to re-post this to the NEC section
I have an old Zinsco commercial distribution panel that uses QFP breakers. I need to install a small sub-panel (70 amps) approximately 100 ft away. The smallest QFB breaker is 125 amps.
Is it code compliant to install #3 THHN from the 125amp breaker to a 70amp breaker at the sub-panel?
One possible work around would be to install a 125amp sub-panel next to the main and then step-down to 70 amps, but this obviously increases the cost quite a bit.
Please site the applicable code(s)
Thanks for the help
I'm going to re-post this to the NEC section