SafetyQuestion 419 of 521
Which sequence correctly describes the basic lockout/tagout procedure before servicing electrical equipment?
a.Notify affected employees, shut down, isolate/disconnect the energy source, apply locks and tags, release stored energy, then verify zero energy
b.Apply locks first, then shut down, verify, and notify workers
c.Verify zero energy, apply tags, shut down, then isolate
d.Shut down, energize a test circuit, remove guards, then lock
Explanation
The correct order is to notify, shut down, isolate, lock and tag, release stored energy, and finally verify zero energy. You cannot lock before shutting down, and verification must come at the end—not before isolation. Removing guards on a live test circuit is unsafe.
Law Reference: Cal/OSHA Title 8 §3314Practice all 521 questions free — no signup required.
Related questions on this topic
- You opened the disconnect for a 480V motor circuit and applied your personal lock and tag. What is the FINAL step required before you may treat the conductors as safe to touch?
- A crew of four electricians is servicing the same de-energized 480V feeder. How should lockout be handled?
- An electrician left the jobsite for the day and forgot to remove his lockout lock. How may it be removed?
- On a construction site, which receptacles must have GFCI protection for personnel?
- A Class A GFCI intended to protect people trips at approximately what ground-fault current?
- What is the difference between a Class A (personnel) GFCI and a 30-milliampere 'equipment' ground-fault protection device?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against California CSLB C-10 Electrical Trade Examination · How we review