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Wiring a gfci circuit breaker this diagram illustrates wiring for a circuit breaker with a built in ground fault circuit interrupter or gfci this 20 amp 120 volt breaker is a form of gfci that can be installed at the circuit source this kind of circuit is used for dishwashers whirlpool spas and other locations where water contact is likely. No im not at the job site its an eaton breaker the 30a circuit is for a 277v lighting circuit i have a neutral line and ground to land in my panel but the breaker looks like a 2 pole breaker this is my first 480v 277v panel im well versed in single phase and know how 3 phase works just never landed on a breaker before. A double pole breaker is needed whenever youre 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. Find a diagram of a breaker box online before getting started this will help you ensure you are working with the correct wires and bus bars as you wire a breaker circuit if at any point you feel unsure of what youre doing consider getting a professional electrician to do this job for you. Circuit breakers protect the wires in your home circuit breakers protect the wires in your home from overheating referred to as an overload and fault currents referred to as short circuits the eaton cutler hammer 30 30 amp 1 in duplex type bd circuit breaker is also known as tandem or circuit limiting breaker