What is required for vertical platform stopping devices?

For vertical platform stopping devices, the requirements typically ensure both safety and reliable operation. Two switches are necessary because they provide redundancy; if one switch fails, the second switch can still function, enhancing safety. This dual-switch system helps to ensure that the platform can be stopped effectively in an emergency or malfunction situation.

The 15 lb maximum pressure specified allows for a balance between operational effectiveness and safety. This pressure threshold is usually adequate to trigger the stopping mechanism of the device without being so sensitive that it could be activated by minor or unintentional forces, which could lead to nuisance stops. Thus, the combination of two switches plus the specified pressure creates a robust system designed to safeguard users while maintaining functional reliability.