Which statement best differentiates lockout from tagout?

• A. Lockout uses a warning tag; Tagout physically prevents energization
• B. Lockout physically prevents energization with a lock; Tagout provides a warning tag indicating the device is locked out, but does not prevent re-energization by others.
• C. Tagout is more secure than lockout
• D. Lockout allows energization with permission

Answer: (B)

Lockout and tagout are two ways to control hazardous energy, but they work differently. Lockout physically prevents energization by placing a secure lock on the energy-isolating device, like a switch or valve, so only the person who placed the lock (or someone with the key) can remove it. Tagout uses a warning tag to indicate the device is isolated, but it does not stop others from energizing the equipment if they bypass the tag. Tags rely on procedures and worker compliance, whereas a lock provides a tangible, reversible barrier. That combination—a lock to physically block energization and a tag to warn—is what makes lockout the more secure control method in practice.