Collapsible gates in an elevator must reject a ball of what minimum diameter?

The requirement for collapsible gates in an elevator to reject a ball of a specific minimum diameter is grounded in safety standards designed to prevent unauthorized entry and to ensure the protection of passengers. The correct choice of 4 1/2 inches is established to minimize the risk of small children or objects being able to pass through the gate, which could lead to dangerous situations such as falls or entrapment.

This 4 1/2 inch standard corresponds with industry best practices and regulatory guidelines ensuring that the openings of the gate are sufficiently small to keep out any object or person that could fit through. The dimensions are carefully considered to balance accessibility while maintaining safety and operational integrity of the elevator system.

Understanding the rationale behind these specifications underscores the importance of adhering to safety codes and regulations in elevator design and operation.