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

Under OSHA's LOTO standard (29 CFR 1910.147), what must an employer do before employees perform LOTO procedures for the first time?

Answer: Train employees and certify the training

OSHA requires employers to train each authorized and affected employee and certify that training has been accomplished.

Which type of energy is specifically addressed by the term 'stored energy' in LOTO procedures?

Answer: Residual energy such as capacitors, springs, or pressurized fluids

Stored (residual) energy includes capacitor charge, compressed springs, pressurized hydraulics/pneumatics, and gravity potential that remain after the primary energy source is isolated.

A construction worker needs to work inside an electrical panel. After de-energizing and locking out, which test confirms zero energy state?

Answer: Testing with an appropriate voltage-rated meter or tester on all conductors

OSHA requires verification of zero energy state by testing with appropriate test equipment rated for the voltage on all conductors before work begins.

What is the minimum approach distance for unqualified workers near exposed energized parts operating at 50–300 volts under OSHA 1910.333?

Answer: Avoid contact — no specific distance required for low voltage

For voltages up to 300V, unqualified workers must avoid contact but OSHA does not specify a minimum numeric distance; qualified workers' approach distances apply.

Which of the following correctly describes a 'tagout' device under 29 CFR 1910.147?

Answer: A prominent warning device that cannot be removed without deliberate action

A tagout device is a prominent warning tag that can only be removed by the authorized employee who installed it and that indicates the energy-isolating device shall not be operated.

On a multi-employer construction site, two subcontractors need to work simultaneously on the same locked-out machine. What LOTO method must be used?

Answer: Each authorized employee applies their own personal lock using a hasp

A hasp (multi-lock device) allows each authorized employee to attach their own personal lock, ensuring equipment cannot be re-energized until every worker removes their lock.

According to NFPA 70E, what is the primary purpose of an Energized Electrical Work Permit?

Answer: To document justification, risk assessment, and safety measures when work on energized equipment cannot be avoided

An Energized Electrical Work Permit formally documents why de-energizing is not feasible, the hazard analysis, required PPE, and approval chain before energized work begins.