2026 Field Lesson: Why a Locked E-Stop Is Not LOTO Under 29 CFR 1910.147

Frequently Asked Questions

Can an emergency stop count as lockout/tagout?

No. An emergency stop is generally a control function, not an energy-isolating device, so it does not replace lockout/tagout for servicing and maintenance under 29 CFR 1910.147.

When can an alternate method be used instead of full LOTO?

Only when the employer can show the method provides protection equivalent to lockout/tagout for the task. That decision should be based on a documented hazard review, not a long-standing habit.

Why are robotic cells especially risky for weak alternate procedures?

Robotic cells often involve multiple energy sources, stored energy, and re-entry during troubleshooting or maintenance. A shortcut that seems controlled can fail quickly when someone exits, resets, and goes back in.

What should a machine-specific robotic-cell procedure include?

It should identify all hazardous energy sources, show the actual isolation points, define the task boundary, and explain re-entry steps. Photo-based procedures and energy-point mapping make those instructions easier to follow on the floor.

What is the biggest lesson for supervisors from this field example?

If the procedure cannot hold up during distraction or a forgotten item, it is not strong enough. Supervisors need to model full protection, because employees will follow the shortcuts they see tolerated.