Electrical Safety & Lockout/Tagout Flashcards

Which NFPA standard is the primary US reference for electrical safety in the workplace?

Answer: NFPA 70E

NFPA 70E, Standard for Electrical Safety in the Workplace, is the primary US standard governing electrical hazard assessment and safe work practices.

What is the purpose of a 'group lockout' procedure when multiple workers are servicing the same equipment?

Answer: To ensure each authorized employee applies their own lock so no single person can remove all protection

Group lockout ensures each authorized employee applies a personal lock so the equipment cannot be re-energized until every worker has removed their lock.

Which condition must be verified BEFORE an authorized employee removes their lockout device and restores energy?

Answer: All tools, materials, and workers are clear of the equipment

Before restoring energy, the authorized employee must confirm all nonessential items are removed and all employees are safely positioned away from the equipment.

Under OSHA 1910.303, what is the required clearance in front of electrical panels rated 600 volts or less for working space?

Answer: 3 feet

OSHA 1910.303(g)(1) requires at least 3 feet of clear working space in front of electrical equipment rated 600 volts or less.

What does a tagout device signify when used instead of a lockout device?

Answer: A warning that the equipment must not be operated, though physical lock-out is not possible

A tagout device is a warning label indicating equipment must not be operated; it does not provide the physical restraint that a lock provides.

Which of the following is an example of 'stored energy' that must be released or restrained during LOTO?

Answer: Hydraulic pressure in an accumulator

Hydraulic pressure in an accumulator is stored (potential) energy that must be safely released or blocked before servicing equipment.