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1 page. This two-hour, free online course offers the knowledge electrical contractors need to guide them through trouble-free installation of AFCI circuit breakers, in the unlikely event that unwanted tripping should occur. AFCIs help reduce the risk of electrical fires in homes. This course was developed by experts at The National Electrical Manufacturers Association (NEMA) and Underwriters Laboratories (UL) Knowledge Services. Electrical inspectors and contractors also provided content for the course.