What is a 'permit to work' system and when is it used?

• A. A daily checklist for attendance.
• B. A formal authorization to perform routine maintenance.
• C. A formal authorization to perform high-risk work (e.g., hot work, confined space); used to ensure controls are in place.
• D. A system for recording training hours.

Answer: (C)

A permit to work system is a formal written process that authorizes specific high‑risk tasks and ensures all safety controls are in place before the work begins. It documents what work is being done, where, and by whom, and it spells out the required precautions—such as isolating energy sources, testing for hazardous atmospheres, having a fire watch, and ensuring proper supervision and communication. The idea is to prevent unexpected incidents by confirming that hazards are evaluated and controls are verified prior to starting work.

This is used for activities known to carry significant risk, like hot work (welding or grinding), entry into confined spaces, work at height, electrical work, or any maintenance that could expose workers to dangerous conditions. The permit stays in effect for a defined period and can be paused or canceled if conditions change, ensuring ongoing safety oversight.

In contrast, a daily attendance checklist or a system for recording training hours do not address the control of dangerous work or the required safety safeguards, and routine maintenance generally does not automatically require a formal permit unless it involves high-risk tasks.