Safety Definitions
The Definition of Permit to Work
Permit to work is a documented system used to control high-risk work activities by requiring specific safety checks and precautions to be verified and signed off before work begins.
Permit to work is a documented system used to control high-risk work activities by requiring specific safety checks and precautions to be verified and signed off before work begins.
A formal, documented authorization system used to control high-risk work activities — such as hot work, confined space entry, or work at height — by requiring specific safety checks, approvals, and precautions to be verified and signed off before work begins.
Before welding near a fuel storage area, a technician must obtain a hot work permit confirming the area has been cleared of flammable materials, fire watch is assigned, and extinguishing equipment is on hand.
Common permit-required activities include confined space entry, hot work (welding, cutting, grinding), work at height, excavation, electrical work on energized equipment, and lockout/tagout procedures. The exact list depends on the hazards present at a given facility.
Permits are typically issued by a designated "competent person" or authorized issuer who has been trained to evaluate the specific hazards of the task and verify that required precautions are in place. This role is often distinct from the person actually performing the work.
Validity periods vary by permit type and site policy, but most are limited to a single shift or a specified time window, after which conditions must be re-verified. If work extends beyond the permit's validity or site conditions change, the permit typically must be renewed or reissued.
Continuing work under an expired permit is a serious procedural violation, since it means the safety conditions verified at issuance are no longer guaranteed to be accurate. Most permit-to-work systems require an immediate stop-work and reassessment before work can resume.
No, though they're often used together. A JSA breaks a task into steps and identifies hazards and controls for each one, while a permit-to-work system is the administrative control that formally authorizes the work to proceed, often referencing a completed JSA as part of the approval.
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