Your statement is not correct.

It is not necessary to increase belt rating when applying a brake. Usually, the brake is tailored to the allowable momentary belt stress allowance. A overload factor of 40% comes to mind, such as with some soft-starting methods.

The same can be said for the take-up, depending on type and its controls. In some cases, the counterweight rating may be increased. In addition, the allowable pulley to belt friction value may be increased depending on the safety issues and potential for belt slippage.

In the later case, a slight increase in belt rating may be warranted. This is only an issue with substantial brake action, that exceeds the norm for the belt rating. Some safety issues demand a larger brake to attempt to reduce likelihood of personnel injury with high rate of braking as implied by a pull-cord stop. Even in this instance, the overall safety of operating personnel may not warrant a highly unusual brake action that otherwise would overstress a belt.

Most belts can be mometarily overstressed to below a safety factor of 4:1. If done, the belt must undergoe special inspection to determine if a local splice or two were damaged that would not be immediiately visible. ■

Yes, if you know what you are doing and how to do it. ■