What safety concern does a ground-fault circuit interrupter address in a shop?

What safety concern does a ground-fault circuit interrupter address in a shop?

• A. Prevents overload on circuits
• B. Detects ground faults and interrupts current to prevent electric shock
• C. Maintains constant voltage to tools
• D. Measures circuit resistance

Answer: (B)

Protecting people from electric shock by quickly cutting power when there is a ground fault. A ground-fault circuit interrupter watches the current in the hot and neutral conductors and, if it senses any leakage to ground—such as through a person touching a live tool or a tool on a wet surface—it trips in a fraction of a second. This rapid shutdown minimizes the current that could flow through a person, reducing the risk of shock or electrocution. The other functions mentioned aren’t what this device does: overload protection is about preventing too much current from flowing and is handled by breakers or fuses; maintaining constant voltage isn’t the role here; and measuring circuit resistance requires test equipment, not a protective interrupter. In a shop environment with moisture, metal parts, and exposed wiring, using a GFCI adds a crucial safety layer by detecting small leakage currents and stopping the circuit quickly.

Protecting people from electric shock by quickly cutting power when there is a ground fault. A ground-fault circuit interrupter watches the current in the hot and neutral conductors and, if it senses any leakage to ground—such as through a person touching a live tool or a tool on a wet surface—it trips in a fraction of a second. This rapid shutdown minimizes the current that could flow through a person, reducing the risk of shock or electrocution. The other functions mentioned aren’t what this device does: overload protection is about preventing too much current from flowing and is handled by breakers or fuses; maintaining constant voltage isn’t the role here; and measuring circuit resistance requires test equipment, not a protective interrupter. In a shop environment with moisture, metal parts, and exposed wiring, using a GFCI adds a crucial safety layer by detecting small leakage currents and stopping the circuit quickly.