In a control panel we have a 3 HP 230/3/60 motor rated at 9.6 FLA. If we use NEC for Motor Circuit Conductors Sizing(Article 430-21.) For the conductor size we have FLA * 125 % or 12 amps or # 14 AWG.
The Circuit Breaker is 20 amps.
If we go to the wire capacity table in the appendix, we see # 14 THHN copper is good for 21 amps. But at the bottom of the table you have the:
"Unless otherwise specfically permitted elsewhere in this Code, the overcurrent protection for conductor types marked with an obelisk (which it is) shall not exceed 15 amperes for No.14, 20 amperes for No. 12 and 30 amperes for No. 10 copper".... and so on.
So do we use # 12 wire or is Article 430 the "Unless otherwise specfically permitted elsewhere in this Code" ?
Which size is correct??
Thanks!!
The Circuit Breaker is 20 amps.
If we go to the wire capacity table in the appendix, we see # 14 THHN copper is good for 21 amps. But at the bottom of the table you have the:
"Unless otherwise specfically permitted elsewhere in this Code, the overcurrent protection for conductor types marked with an obelisk (which it is) shall not exceed 15 amperes for No.14, 20 amperes for No. 12 and 30 amperes for No. 10 copper".... and so on.
So do we use # 12 wire or is Article 430 the "Unless otherwise specfically permitted elsewhere in this Code" ?
Which size is correct??
Thanks!!
