CSLB C-33 Painting & DecoratingSafetyEasy
A painter is using a portable electric paint sprayer on a damp concrete floor. To prevent electric shock, what is the most critical safety device that must be used with the sprayer's power cord?
- AA circuit breaker
- BA voltage regulator
- CA surge protector
- DA Ground Fault Circuit Interrupter (GFCI)
Show answer & explanationAnswer & explanation
Correct answer: D. A Ground Fault Circuit Interrupter (GFCI)
A GFCI is designed to protect against electric shock by detecting imbalances in current flow and quickly shutting off power, which is crucial when working with electrical tools in damp or potentially wet conditions.
Why the other options are wrong
- A. A circuit breaker protects circuits from overcurrents and short circuits, but may not trip fast enough to prevent a fatal shock.
- B. A voltage regulator maintains a constant voltage output, not primarily a shock prevention device.
- C. A surge protector protects equipment from voltage spikes, not electric shock to personnel.
GFCI
Ground Fault Circuit Interrupter: A device that protects against electric shock by detecting current leakage to ground and quickly interrupting the power supply.
- Essential in wet or damp environments.
- Trips faster than standard circuit breakers.
- Required by OSHA for temporary wiring on construction sites.
Memory trick: GFCI shocks to ground, protecting you around.