What is the purpose of AFCI protection in terms of fire prevention?

• A. To detect and interrupt arcing faults that can ignite fires in electrical wiring
• B. To reduce electric shock hazards
• C. To control voltage drop on feeders
• D. To protect against short circuits only in motors

Answer: (C)

AFCI protection is designed to prevent fires by catching arcing faults in the electrical system. An arc fault, such as a loose connection or damaged insulation, can generate heat that starts fires even when the current isn’t a large short circuit. An AFCI monitors the current and voltage waveforms for the distinctive, erratic patterns of arcing and trips quickly when such a pattern is detected, stopping the arc and reducing fire risk.

The other options don’t fit fire prevention as closely: reducing electric shock hazards is mainly the job of GFCI devices, not AFCIs; controlling voltage drop on feeders relates to maintaining voltage levels rather than fire prevention; and protecting against short circuits only in motors is not accurate since AFCIs detect arcing faults anywhere in the circuit, not just in motors.