CSLB C-33 Painting & DecoratingSafetyEasy
A painter is using a portable electric paint sprayer on a damp concrete floor. To prevent electrical shock, what safety device is most critical?
- AA surge protector
- BA circuit breaker with the correct amperage
- CA Ground Fault Circuit Interrupter (GFCI)
- DA voltage regulator
Show answer & explanationAnswer & explanation
Correct answer: C. A Ground Fault Circuit Interrupter (GFCI)
A Ground Fault Circuit Interrupter (GFCI) detects imbalances in electrical current, indicating a ground fault, such as current flowing through a person. It quickly shuts off power, preventing severe electrical shock, especially in damp or wet conditions.
Why the other options are wrong
- A. A surge protector protects equipment from voltage spikes, not people from ground faults.
- B. A circuit breaker protects circuits from overcurrents, but may not trip fast enough for a ground fault to prevent shock.
- D. A voltage regulator maintains a constant voltage, but does not protect against ground faults.
Ground Fault Circuit Interrupter (GFCI)
A device that protects against electrical shock by detecting imbalances in current flow and quickly disconnecting the power.
- Required in wet locations and construction sites.
- Detects current leakage to ground (e.g., through a person).
- Trips faster than a standard circuit breaker for ground faults.
Memory trick: Ground faults mean 'Go Fast, Cut Instantly' with a GFCI.