Is it okay to use two different wire sizes on a jumper to a breaker? The breaker is a 20amp with #12 wire on the circuit. There is a jumper wire connected to the #12 wire that is a #14 wire which is connected to the breaker. I believe you need to correct wire size. One electrician told me it was okay and the other said #12 wire should be used on the jumper. Looking for your opinions
The OCPD needs to be smaller or equal to the size listed in 240.4(D) of the NEC. Except for certain installations (not this one) #14 can not be protected at 20 amps.