Bridgeport input power question - The Home Machinist! Apr 05, 2015 · If you brought a 30 amp feed to a sub-panel then put in the two 115v circuits with 20 amp breakers and 12 gauge wiring it would meet code. However if you mean a 'junction box' as just a point where you can wirenut 10 and 12 gauge wires together it will not meet code.
