Lockout

What it means

A lockout physically prevents operation. Under 1910.147(c)(2), if an energy isolating device can be locked out, the program uses lockout unless the employer can show that tagout gives full employee protection.

The sequence in 1910.147(d) is: prepare, shut down, isolate, apply the lock or tag, relieve stored energy, and verify isolation before starting work.

Example

To clear a jam in a conveyor, a mechanic stops it with the normal controls, opens the disconnect, puts a personal lock on the disconnect, bleeds the air from the take-up cylinder, then presses start to confirm nothing moves before reaching in.

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

When is tagout alone allowed instead of lockout?

When the energy isolating device can't be locked out, or when the employer can show that its tagout program gives employees full protection, equivalent to lockout (1910.147(c)(2) and (c)(3)).