What is a lock in safety tagging systems?

• A. A simple label with no security features
• B. Requires a password
• C. Requires a keyboard entry to confirm tag status
• D. Requires a key or combination that prevents unauthorized manipulation

Answer: (D)

A lock in safety tagging systems is a physical security device that is applied to the energy-isolating point along with the warning tag. It requires a key or a combination to remove, and this control is kept by the worker who applied it. Because of that, only authorized personnel can re-energize the equipment, preventing unauthorized or accidental manipulation. The purpose is to provide positive, enforceable control over the isolation, beyond what a tag alone can offer. A simple label or requiring a password or keyboard entry does not provide the same hand-on, tamper-resistant control that a physical lock with a unique key or combination does.