How to Wire a Double 40 Amp Breaker for a Home A/C Unit Wiring a double-pole, 40-amp circuit breaker for a central air Slide the cable through the cable connector on the side of the panel box and secure "How to Wire a Double 40 Amp Breaker for Homeline 70 Amp Load Center Wiring Diagram | Free Wiring Homeline 70 Amp Load Center Wiring Diagram - Collections Of Homeline Load Center Wiring Diagram Sample. Shop Square D Homeline 80 Circuit 40 Space 200 Amp Main Breaker Plug. Square D 70 Amp Load Center Wiring Diagram Qo Free Best Homeline. Square D 70 Amp Load Center Wiring Diagram Qo Free Best Homeline. Circuit Breaker Wiring Diagrams - Do-it-yourself-help This page contains wiring diagrams for a service panel breaker box and circuit breakers including: 15amp, 20amp, 30amp, and 50amp as well as a GFCI breaker and an isolated ground circuit. Circuit Breaker Panel Box Wiring Diagram. This diagram illustrates some of the most common circuits found in a typical 200 amp circuit breaker service panel box. How to Hook up a 30-Amp Double Pole Breaker | Hunker A double-pole breaker is needed whenever you're doing 240-volt wiring. It consists of a pair of breakers arranged side by side so they contact alternating bus bars. To install one, attach the hot wires to the breaker, the neutral wire to the neutral bus and ground wire to the ground bus.