What is the required design factor for cable winches according to USITT standards?

The required design factor for cable winches according to USITT standards is set at 7:1. This means that the winches must be capable of handling seven times the maximum intended load. This high design factor is essential for ensuring safety and reliability in theatrical rigging, as it accounts for various factors such as dynamic loading, wear and tear, and unexpected stresses that might occur during operation. By adhering to a design factor of 7:1, the rigging system provides a significant safety margin, reducing the risk of failures that could result in accidents or injuries in a performance environment. This standard reflects a commitment to the safety of equipment operators and performers alike.