What is the minimum design factor for personal hoists?

The minimum design factor for personal hoists is established to ensure safety and reliability during operation. A design factor of 10:1 means that the hoist is tested and rated to lift loads that are ten times greater than the maximum intended load. This level of safety is crucial because personal hoists are used to lift individuals, and any failure during operation can result in serious injury or fatality.

The choice of a 10:1 design factor reflects industry standards for personal lifting devices, emphasizing the need for rigorous safety margins. This factor provides assurance that even under harsh conditions or unexpected stresses, the hoist can safely support the load without risking a failure. Understanding this concept helps in the proper selection and use of hoisting equipment in theatrical rigging and other applications where safety is paramount.