Which of the following is NOT a function of a ground-fault circuit interrupter?

A ground-fault circuit interrupter (GFCI) is designed primarily to enhance safety by monitoring the current flowing through electrical circuits and protecting against ground faults. When it detects an imbalance in the electrical current, which indicates that some current is escaping to the ground (potentially through a person), it will interrupt the circuit to prevent electrical shock.

The core functions of a GFCI include detecting ground faults, protecting against electrical shock, and interrupting the supply of electricity under fault conditions. These functionalities help safeguard individuals from the dangers posed by electrical faults and improper grounding.

Preventing circuit overload, on the other hand, is not a function associated with GFCIs. Circuit overload protection is typically managed by circuit breakers or fuses, which are designed to interrupt the circuit when the current exceeds safe levels. This is distinct from the role of a GFCI, which focuses on ground faults and preventing shock rather than managing overall circuit loading. Therefore, this explanation clarifies why preventing circuit overload is the answer that does not align with GFCI functions.