CHST - Construction Health and Safety Technician Electrical Safety and LOTO Questions and Answers Flashcards

A GFCI trips repeatedly when a power tool is plugged in on a construction site. What is the safest immediate action?

Answer: Remove the tool from service and have it inspected/repaired

Repeated GFCI tripping indicates a ground fault in the tool; it must be removed from service and inspected by a qualified person before further use.

What is the correct sequence for re-energizing equipment after LOTO maintenance is complete?

Answer: Inspect work area → notify affected employees → remove each worker's lock → re-energize

The proper sequence is: ensure all tools/workers are clear, notify affected employees, have each authorized worker remove their own lock, then restore energy.

Which condition makes using tagout instead of lockout acceptable under 29 CFR 1910.147?

Answer: The energy-isolating device is not capable of being locked out and the employer can demonstrate equal protection

Tagout alone is permitted only when the energy-isolating device cannot physically accept a lock AND the employer provides equivalent protection through additional means.

Under OSHA 29 CFR 1926.403, what is the maximum allowable voltage for flexible cords used with portable tools on construction sites without additional overcurrent protection?

Answer: The standard does not set a voltage limit for flexible cords

OSHA 1926.403 addresses conductor use and protection requirements but does not set a specific voltage ceiling for flexible cords; insulation and rating requirements apply based on application.

An electrical arc flash incident on a construction site results in second-degree burns to a worker wearing standard work clothes. Which NFPA 70E concept was most likely neglected?

Answer: Arc flash hazard analysis and appropriate arc-rated PPE selection

Arc-rated PPE matched to the incident energy level from a site-specific arc flash hazard analysis would have reduced burn severity even when arc flash occurs.

Which OSHA construction standard governs electrical safety requirements specifically for the construction industry, as distinct from general industry?

Answer: 29 CFR 1926.400–449

Subpart K (29 CFR 1926.400–449) of OSHA's construction standards covers electrical safety requirements specific to construction activities.

What does the term 'qualified person' mean in the context of OSHA's electrical safety standards?

Answer: A person trained and knowledgeable in electrical hazards and authorized to work on or near energized equipment

OSHA defines a qualified person as one who has received training on electrical hazards and the skills to distinguish exposed live parts and determine their nominal voltage.