Alternating tread devices are limited by the maximum occupant load they can serve. What is that limit?

Alternating tread devices are specialized types of stairs designed to provide a means of egress in specific scenarios. Their construction is distinct from traditional stairs in that they allow for a reduced footprint and steeper ascent. However, because of these unique characteristics, there are limitations placed on their use to ensure occupant safety.

The maximum occupant load that alternating tread devices can serve is capped at three individuals. This restriction is based on safety standards, which aim to mitigate the risks associated with egress, especially in emergency situations. Having a limit of three allows for safer movement and ensures that occupants can exit quickly and efficiently, reducing congestion and the potential for accidents during a hurried evacuation.

This limit reflects the need for proper spacing and accessibility, ensuring that people can use the devices without the risk of obstruction or injury. Therefore, a maximum of three occupants is set to maintain safety protocols within buildings where such devices are installed.