Millwright Level 1 Practice Exam

Which of the following hazards can a GFCI help to mitigate?

1. Excessive pressure

2. Electrical overload

3. Overcurrent issues

4. Ground faults

The correct answer is: Ground faults

A Ground Fault Circuit Interrupter (GFCI) is specifically designed to protect against ground faults, which occur when there is an unintended path between the source of electricity and a grounded surface. This can lead to electric shock if a person comes into contact with the faulty circuit. The GFCI works by monitoring the current flowing through the circuit and tripping (disconnecting the power) when it detects an imbalance, such as when electricity escapes the intended pathway and flows through a person or to the ground. While electrical overload and overcurrent issues can cause safety hazards, they are typically addressed by circuit breakers or fuses designed to interrupt the electrical flow when too much current is detected. Similarly, excessive pressure is not related to electrical safety and requires different forms of protection. In summary, GFCIs are specialized devices focused on the prevention of ground faults, making them essential for ensuring safety in environments where electrical tools and equipment are used near water or damp conditions.