Electrical Safety and LOTO Flashcards
6 cards from real CHST practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Electrical Safety and LOTO flashcards as text
When multiple workers are performing LOTO on the same equipment, what device allows each authorized employee to apply their own personal lock?
Answer: A hasp (multi-hole lockout device)
Group lockout requires a hasp — a multi-hole device attached to the energy isolation point — so each authorized employee applies their own personal lock, ensuring no single person can restore energy until every worker removes their lock.
Under OSHA's LOTO standard 1910.147, what must be done if a piece of equipment cannot be locked out because it has no provision for a lock?
Answer: A tagout device must be used along with additional safety measures to provide protection equivalent to lockout
When a lockout device cannot be applied, a tagout device must be used and additional measures must be taken to provide a level of safety equivalent to lockout, such as removing a valve handle or blocking a switch.
What is the correct final step to verify zero energy state before beginning work under a LOTO procedure?
Answer: Attempt to operate the equipment using normal operating controls to confirm it will not start
After applying lockout devices and releasing stored energy, the authorized employee must verify zero energy state by attempting to operate the equipment using normal controls — if it does not start, zero energy is confirmed.
Under OSHA 1910.147, what is required before an authorized employee may restore energy to equipment after LOTO servicing is complete?
Answer: All tools and materials removed, all workers clear of the machine, and all LOTO devices removed by the employees who applied them before the energy-isolating device is operated
Before restoring energy, all nonessential items must be removed, all workers must be clear and notified, and each employee must remove their own lockout device before the energy-isolating device is operated.
Under OSHA 1926.403, electrical equipment must be installed and used in accordance with which national standard to meet the design requirements for construction sites?
Answer: The National Electrical Code (NEC), NFPA 70
OSHA 1926.403(a) requires that electrical equipment used on construction sites comply with the design requirements established in the National Electrical Code (NFPA 70).
Under the hierarchy of controls for electrical hazards, what is the preferred method before any other control when working near energized electrical equipment?
Answer: Establish an Electrically Safe Work Condition (ESWC) by de-energizing and locking out the equipment
The highest-order control for electrical hazards is elimination — specifically, de-energizing equipment and establishing an Electrically Safe Work Condition through the LOTO process before any work begins.