What safety consideration is emphasized when loading an elevator car?

Verifying the capacity of an elevator car is crucial for safety during loading because exceeding its weight limit can lead to equipment failure, accidents, and potential harm to passengers and personnel. Each elevator is designed to handle a specific load, which ensures that the mechanical components, such as the hoisting mechanism and cables, function properly without being over-stressed. This verification process usually involves checking the displayed capacity rating on the elevator's interior or door frame to ensure compliance with safety standards.

The other aspects mentioned, such as the car being fastened securely, keeping the doors open, and ensuring the elevator is stationary, contribute to overall safety but do not address the specific critical issue of weight capacity. If the capacity is not respected, no amount of securing or positioning can prevent potential mishaps. Thus, the emphasis on verifying capacity reflects a fundamental requirement for safe elevator operation during loading.