When machinery requires maintenance, cleaning, or repairs, unexpected startup can be fatal. Residual electrical, hydraulic, pneumatic, or mechanical energy must be completely isolated before any hands-on work begins. The Energy Isolation rule is simple: Lock out, Tag out, and Verify. Isolate the energy source, apply your personal lock and tag, and test the system to ensure it is completely dead before you begin. Never rely on someone else’s lock—your safety depends on your key.
Real-World Impact:
In a typical manufacturing incident documented by OSHA, a maintenance worker entered a large industrial mixing machine to clear a routine jam without deploying a personal padlock on the breaker. A coworker, unaware someone was inside, flipped the power switch back on from the main floor. The machine restarted instantly, resulting in fatal crushing injuries.
Source: OSHA Safety Data & Enforcement Reports
Reflective Questions:
Do you ever let a supervisor or coworker place a lock on your behalf, or do you always control your own key?
Do you always physically test and try to turn on a machine after locking it out to verify the energy is 100% isolated?
