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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. 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. This article will provide an overview of how a professional electrician connects a residential electrical circuit breaker panel to the main service wires coming into the home and to the individual branch circuits in your home warning this is not a diy project for most homeowners this is very dangerous work if you are not an expert and in most communities building codes may not even . Insert the end of the hot wire into the terminal on the new circuit breaker and tighten the setscrew in a 120 240 volt circuit connect the red hot wire to the second circuit breaker terminal lock the new circuit breaker into an open slot by slipping the side with the attached hot wire under the tab beside the hot bus bar. The basic circuit breaker consists of a simple switch connected to either a bimetallic strip or an electromagnetthe diagram below shows a typical electromagnet design the hot wire in the circuit connects to the two ends of the switch