ICC Commercial Building Inspector Practice Test

What is the minimum width of a corridor serving an occupant load of 300 persons in a Group E occupancy?

1. 60 inches

2. 72 inches

3. 80 inches

4. 90 inches

The correct answer is: 72 inches

In Group E occupancies, which typically include educational facilities like schools, the minimum width of corridors is determined by several factors, including the occupant load. For a corridor serving an occupant load of 300 persons, the code requires a minimum width to ensure safe and efficient egress during an emergency. The correct width is established to accommodate the flow of occupants safely and to comply with the requirements set forth in the International Building Code (IBC) and the National Fire Protection Association (NFPA) guidelines. Specifically, for 300 occupants, the code dictates that the minimum corridor width must be sufficient to allow for rapid evacuation, accounting for various factors like access for emergency personnel and equipment. In this case, the width of 72 inches aligns with the safety protocols and practical needs outlined in the building codes for this level of occupancy. It provides an appropriate clearance to facilitate movement, thus significantly reducing the risk of crowding or blockage in panic situations. Other widths listed would either not meet the safety requirements for egress or may be too excessive for standard design considerations in commercial environments.