What is the difference between tagging a crane out of service and locking it out, and when should each be used?

• A. Tagging places a visible warning tag; locking physically prevents operation; LOTO requires lock and tag to control energy sources and is used during maintenance or repair
• B. Tagging physically prevents operation; locking is only visual
• C. Both are identical in function
• D. Tagging is used during normal operation

Answer: (A)

The difference comes down to control of energy vs. a warning. A tag is a visible warning that the crane is out of service and should not be operated, but it does not physically stop the equipment from being energized or operated. Locking provides a physical barrier: a lock on the energy-isolating device prevents the crane from being re-energized until the lock is removed by the person who applied it.

Tagging is used to communicate that maintenance or inspection is happening or that the crane is not to be used, but it relies on someone following the warning. Lockout, when a lock is applied (often with a corresponding tag), actually prevents the energy source from being re-energized. Lockout/Tagout (LOTO) is the formal process that uses both a lock and a tag to control all energy sources and protect workers during maintenance or repair.

In practice, use tagging for situations where a warning is sufficient or where a lockout isn’t feasible for a short task, but use lockout/tagout for maintenance or repair where there is a risk of unexpected energization or stored energy becoming hazardous. The lock is the primary safeguard, and the tag provides accountability and information for authorized personnel.