7.3 Evacuation, Shelter, Life Safety, and Accountability

Moving People Safely Under Pressure

Evacuation and shelter decisions are core emergency-response skills. The goal is life safety, not simply clearing a building. A safety professional must understand the hazard, the site layout, the exposed population, the warning method, and the available routes. The best action for a fire differs from the best action for severe weather, an outdoor release, or a security threat.

Egress design is governed by NFPA 101, the Life Safety Code, and OSHA's exit-route standards (29 CFR 1910.36–1910.37). Key numbers worth knowing: a means of egress has three parts — exit access, exit, and exit discharge; most occupancies require at least two separate exits (more for high occupant loads), arranged so that if one is blocked the other remains usable. NFPA 101 sets a common-path-of-travel limit (often 75–100 ft depending on occupancy) and dead-end corridor limits (commonly 20–50 ft).

Exit signs and emergency lighting must provide illumination for at least 90 minutes at an average of 1 foot-candle (declining to 0.6 fc) along the egress path. Exit doors generally must swing in the direction of travel when serving 50 or more occupants and must open with a single, non-key motion.

Protective Action Decision Points

Shelter is not a single concept. Severe weather requires interior areas away from glass and exterior walls; an external chemical release requires staying indoors, closing openings, and shutting down HVAC intake when authorities direct; a violent intruder requires lockdown. The plan must state who can order shelter, how the message is delivered, and how people are released with an all-clear.

Accountability is where plans most often fail. A head-count may rely on supervisor rosters, badge/access systems, visitor logs, contractor sign-in sheets, radio checks, or roll calls at the assembly point. Each method has weaknesses: rosters miss shift swaps, badge systems can fail during a power loss, and visitor logs may be incomplete. The plan must define who collects the count, who reports a missing person, and who receives that information so responders can act. A clear rule of thumb for the exam: report numbers and last-known location through the established channel — never send an untrained worker back in to search.

Accessible evacuation matters. Workers, visitors, or contractors may have mobility, sensory, language, or medical needs. Plans should provide assistance — designated areas of refuge, buddy systems, communication aids, and coordination with responders — without requiring untrained coworkers to perform dangerous rescue, such as carrying someone down a smoke-filled stairwell.

The Americans with Disabilities Act and NFPA 101 contemplate horizontal exits, areas of refuge with two-way communication, and elevator use only where specifically designed for emergency evacuation; the default during a fire remains the stairs, so the refuge-and-communicate approach protects both the individual and the would-be rescuer.

Life safety also means preventing secondary harm. Employees must not block fire-department access, return for personal belongings, drive vehicles through evacuation traffic, or gather where vapors may travel downwind. Supervisors must not order reentry to recover tools or restart production. Reentry requires authorization after the hazard is evaluated.

Egress Capacity: A Worked Example

Egress is not only about having exits — it is about having enough width. NFPA 101 assigns a capacity factor (commonly 0.2 inch of clear width per occupant for level components such as doors and corridors, and 0.3 inch per occupant for stairs in most occupancies). For a room with an occupant load of 300 people exiting through level doors, required egress width is roughly 300 x 0.2 = 60 inches total, which typically means two or more doors. If a planner counts a single 36-inch door for that load, the calculation flags the deficiency.

Occupant load itself is derived from the floor-area allowance per occupant for the use (for example, a denser assembly use versus a sparser business use), which is why occupancy classification drives the whole egress design. The exam may not ask for the arithmetic, but it can ask whether the egress is adequate for the population — and the answer turns on capacity, not just door count.

Measuring Drill Performance

Drills should measure behavior, not just elapsed time. Useful evaluation questions include: Did workers hear and recognize the alarm? Did they use correct primary or alternate routes? Did assigned sweepers act only when safe and only in their zone? Did the assembly area create traffic or downwind exposure? Were contractors, visitors, and accessible-needs individuals counted and assisted? Did someone know exactly how to report a missing person and to whom?

ASP questions often offer a fast-but-unsafe option; choose the answer that matches the hazard, protects people, accounts for everyone, communicates with responders, and controls reentry until an authorized all-clear.