Which type of circuit requires the use of GFCI protection?

The use of Ground Fault Circuit Interrupter (GFCI) protection is essential for outdoor circuits due to the heightened risk of electrical shock in environments exposed to moisture. Water and electricity can create hazardous conditions, making it critical to ensure that any electrical outlets or devices used in outdoor settings are equipped with GFCI protection. This safety mechanism monitors the current flowing through the circuit and can quickly shut off power if it detects an imbalance, which could indicate a ground fault, thus protecting users from potential electrical shock.

Outdoor circuits are particularly prone to these issues because they are often exposed to rain, humidity, and other conditions that can increase the risk of electrical accidents. The National Electrical Code (NEC) explicitly mandates GFCI protection for specific outdoor applications to ensure safety and compliance with industry standards.