Confined Space Classification

A competent authority must classify the confined space as permit-required or non-permit required based on an evaluation of the hazards.

A permit-required confined space is defined as a confined space that has one or more of the following:

• Contains or has the potential to contain a hazardous atmosphere
• Contains a material that has the potential for engulfing an entrant
• Has an internal configuration such that an entrant could be trapped or asphyxiated by inwardly converging walls or by a floor that slopes downward and tapers to a smaller cross-section
• Contains any other recognized serious safety or health hazard

A permit-required confined space requires written authorization for entry. The permit reviews the purpose of entry, the time spent inside the confined space, the atmospheric conditions inside, the communications and safety equipment used, the hazard controls, and the qualified entry team.

Examples of permit-required confined spaces include sewers and manholes, grain bins, and gasoline or oil tanks.

A non-permit required confined space is a confined space that does not contain or have the potential to contain any hazards capable of causing death or any serious physical harm.

Examples of non-permit confined spaces include equipment closets, machinery cabinets, ventilated tunnels, and crawl spaces under homes.

To learn more about Firefighter Confined Space visit our Firefighter Confined Space Entry & Rescue Online Training web page.