Which methods constitute energy isolation in robot systems?

• A. Lockout devices alone.
• B. Lockout devices, disconnect switches, and tagout procedures.
• C. Warning lights and audible alarms only.
• D. Regular interviewing of operators.

Answer: (B)

Energy isolation is about preventing any release of hazardous energy from a robot system while maintenance or repair is performed. In robotics, energy can come from electrical, hydraulic, pneumatic sources, as well as stored energy like springs or compressed fluids, so stopping energy flow and preventing re-energization is essential for safe work.

The strongest approach combines lockout devices, disconnect switches, and tagout procedures. Lockout devices physically lock energy-control points so they cannot be turned back on. Disconnect switches provide a clear, verifiable break in the power path, ensuring the circuit is opened. Tagout procedures add warning information—who is isolating the equipment, when, and why—so others understand that energy has been isolated and should not be restored until the tag is removed by the authorized person. Using all three creates a robust, multi-layered barrier against unexpected energization and unmanaged stored energy, which is why this combined approach is the best choice.

Warnings or alarms alone do not stop energy from flowing or being stored, and interviewing operators does not physically isolate any energy source. Lockout devices alone may prevent energizing but may not address all energy paths or convey status, whereas the full trio ensures comprehensive isolation across multiple energy sources.