Tagout
Putting a warning tag on an energy isolating device to show the equipment must not be operated until the tag is removed.
Definition, in the source's words
29 CFR 1910.147(b)(opens ecfr.gov in a new tab)“Tagout. The placement of a tagout device on an energy isolating device, in accordance with an established procedure, to indicate that the energy isolating device and the equipment being controlled may not be operated until the tagout device is removed.”
What it means
Compare the wording: lockout ensures equipment cannot be operated; tagout indicates it may not be. A tag is a warning, not a physical restraint, which is why lockout is preferred whenever the device can take a lock.
Example
An older valve has no way to accept a lock. The authorized employee closes it and attaches a tag with their name. Because a tag only warns, the program adds measures such as closing and tagging a second valve upstream.
Where it appears on the exam
ASP: ASP11 Domain 2, Safety Programs and Concepts
Practice: Lockout/Tagout (Hazardous Energy)
CSP: CSP11 Domain 1, Advanced Application of Safety Principles
Practice: Confined Spaces and Lockout/Tagout
Questions
- Is a tag as good as a lock?
- Not by itself. A tag only warns. Tagout is allowed alone when a device can't be locked, or when the employer shows its tagout program gives full protection equivalent to lockout.
Related
Checked 2026-10-16. Spot a problem? Email hello@passcited.com.