The hazard
Machines can start up without warning, and stored energy can be released even after the power is off. Lockout tagout keeps a machine from moving or releasing energy while someone is working on it. It only works when everyone follows the same steps, every time.
The action
An authorized employee is the person who locks out or tags out a machine to service or maintain it. An affected employee runs that machine or works in the area where the servicing is being done. An affected employee becomes an authorized employee when their duties include that servicing or maintenance. (29 CFR 1910.147(b))
ASK THE CREW
What do you do if you find a lock or tag on equipment you need to use?
Takeaway: Before you reach in, lock it out, try it, and keep your key until the job is done.
From the talk: Lockout/tagout (LOTO). Read it in full, free, with the questions and the sign-in sheet.