Millwright Level 1 Practice Exam 2025 - Free Millwright Practice Questions and Study Guide

The main purpose of a Ground Fault Circuit Interrupter (GFCI) in a work environment is to protect against electrical shock. GFCIs are designed to detect ground faults, which occur when electrical current strays from its intended circuit. This can happen, for example, if someone accidentally comes into contact with a live wire or a faulty device. When a ground fault is detected, the GFCI quickly cuts off the power supply, significantly reducing the risk of a potentially dangerous electrical shock. This is particularly important in damp or wet environments, such as construction sites, where the risk of electric shock is higher.

While factors such as power efficiency, operational speed, or tool performance are relevant in various contexts, they do not represent the primary function of a GFCI. The critical safety role it plays in preventing accidents and injuries due to electrical shocks is essential for maintaining a safe work environment.