CHST Electrical Safety and LOTO 5

Question 1

When must a LOTO periodic inspection be performed, and what must it include?

Accepted Answer

At least annually; a review of the procedure with each authorized employee

Answer

OSHA 29 CFR 1910.147(c)(6) requires LOTO procedures to be inspected at least annually and reviewed with each authorized employee who uses the procedure.

Question 2

A construction electrician is working on a 480V motor control center. After locking out the breaker, what is the next critical step before touching conductors?

Accepted Answer

Test for absence of voltage using an appropriate voltage tester

Answer

After lockout, workers must verify zero energy state by testing with a voltmeter or tick tracer rated for the voltage before touching any conductors.

Question 3

Which type of stored energy must be addressed during LOTO on a hydraulic press in addition to electrical lockout?

Accepted Answer

Pneumatic, hydraulic, gravitational, and spring (mechanical) energies

Answer

LOTO must address all forms of hazardous energy including electrical, pneumatic, hydraulic, gravitational, thermal, and mechanical (spring) energy.

Question 4

On a construction site, temporary wiring must be protected by GFCIs or an assured equipment grounding conductor program (AEGCP). Under the AEGCP, how frequently must receptacles be tested?

Accepted Answer

Before first use, after repairs, and at 3-month intervals

Answer

OSHA 1926.404(b)(1)(iii) requires AEGCP receptacles to be tested before first use, after repairs, and at 3-month intervals.

Question 5

What is the purpose of a 'try-out' (or test) step after applying lockout to a machine?

Accepted Answer

To verify the machine cannot be started before work begins

Answer

The try-out step verifies the energy isolation was successful by attempting to start or operate the equipment before performing maintenance.

CHST - Construction Health and Safety Technician Practice Test

CHST - Construction Health and Safety Technician Practice Test

CHST Electrical Safety and LOTO 5