What are the two main components of lockout-tagout procedures?

• A. A lockout device to secure energy isolation.
• B. A tag to indicate equipment is hazardous.
• C. A lockout device to secure energy isolation and a tag to indicate equipment is hazardous.
• D. A procedure manual and a risk assessment.

Answer: (C)

Lockout-tagout is about preventing unexpected energization during maintenance by both isolating the energy source and signaling that work is being done. The two main components are a lockout device to physically secure the energy isolation and a tag to indicate the equipment is hazardous and should not be operated. The lockout provides a real, physical barrier against re-energizing the system, while the tag communicates the status and who is protecting it, helping others avoid bypassing the control. Relying on just a lock without a tag leaves warning gaps, and relying on just a tag without a lock leaves no physical restraint—together they give both safety and clarity, which is why this combination is essential.