Lock Out, Tag Out, Try Out Procedures

By:  The Mine Safety Institute, Part 46 New Miner Training
Part 46 On-Demand Training,  Video Sample of SLock Out, Tag Out, Try Out Procedures

Lock Out, Tag Out, Try Out Procedures

Hazardous Energy Is Deadly

Performing maintenance on machinery can be very dangerous.  People need to know that maintenance is being performed so that machinery isn’t turned on while the mechanic is working on the machine and so that no electrical current is traveling through the machine.

Properly communicating that equipment is being serviced and putting safety measures in place to ensure that equipment isn’t turned back on until service is completed is integral to avoiding accidents.

Always be sure to follow the Lock-Out, Tag-Out, Try-Out Procedures for your mine.

Lock-Out, Tag-Out, Try-Out


  • Place a lock to isolate the circuit and prevent it from being turned on
  • Only the technician performing the work should place the lock
  • Only the technician performing the work should remove the lock
  • Multiple technicians will result in multiple locks on the same circuit.


  • Large tags are placed on the lock(s) to make them more visible
  • These tags will likely provide more information about the work being performed and who is performing it
  • Always follow the exact protocol for tag-out at your mine site


  • Never assume that if you have locked out a circuit that it is off
  • Always verify a lock-out by testing the equipment before beginning maintenance work