Which statement best describes the purpose of lockout/tagout systems?

• A. They are designed to expedite cleanup after an incident
• B. They provide ongoing real-time monitoring of equipment
• C. They replace the need for PPE
• D. They prevent unauthorized activation of machinery or electricity

Answer: (D)

Lockout/tagout is about controlling hazardous energy so equipment can’t start up or release stored energy while someone is performing maintenance. The idea is to isolate the machine from its energy sources and secure that state. A lockout device physically prevents the energy source from being reactivated, while a tag communicates that the equipment is under maintenance and warns others not to energize it. The person who applied the lock is the one who can remove it, ensuring the worker’s safety throughout the job. This focus on preventing unintended or unauthorized activation is what makes lockout/tagout essential.

That’s why it isn’t about speeding up cleanup after an incident, nor about real-time monitoring of equipment, and it doesn’t replace PPE. PPE protects the worker from hazards during work, but lockout/tagout specifically prevents the machine or system from being energised while maintenance is in progress.