CHST Electrical Safety and LOTO 3

Question 1

When multiple workers are performing LOTO on the same equipment, what device allows each authorized employee to apply their own personal lock?

Accepted Answer

A hasp (multi-hole lockout device)

Answer

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.

Question 2

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?

Accepted Answer

A tagout device must be used along with additional safety measures to provide protection equivalent to lockout

Answer

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.

Question 3

What is the correct final step to verify zero energy state before beginning work under a LOTO procedure?

Accepted Answer

Attempt to operate the equipment using normal operating controls to confirm it will not start

Answer

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.

Question 4

Under OSHA 1910.147, what is required before an authorized employee may restore energy to equipment after LOTO servicing is complete?

Accepted 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

Answer

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.

Question 5

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?

Accepted Answer

The National Electrical Code (NEC), NFPA 70

Answer

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).

CHST - Construction Health and Safety Technician Practice Test

CHST - Construction Health and Safety Technician Practice Test

CHST Electrical Safety and LOTO 3