Electrician's Licensing Practice Exam

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Receptacles in dwelling accessory buildings that are below grade must have which type of protection?

Surge protection
GFCI protection
Overcurrent protection
Fuse protection

The correct answer is: GFCI protection

In dwelling accessory buildings where receptacles are installed below grade, the requirement for Ground Fault Circuit Interrupter (GFCI) protection is essential for safety. GFCIs are designed to protect users from electric shock by monitoring the flow of electricity and cutting the power if an imbalance is detected, such as when water is present or when a person comes into contact with a faulty electrical component. Due to the higher risk of moisture and water accumulation in below-grade environments, receptacles in these areas are particularly vulnerable to ground faults. By implementing GFCI protection, the risk of serious electric shock in potentially damp or wet conditions is significantly reduced, promoting safety in locations such as basements or outdoor accessory buildings. Other forms of protection, such as surge protection, overcurrent protection, or fuse protection, while important in their respective capacities, do not specifically address the heightened electric shock hazard posed by moisture that GFCIs are explicitly designed to mitigate.