FAQ’s for Common Questions
What is the working load?
Working load limit (wll) is the maximum load which should ever be applied to the product, under any condition. The wll is based on a load uniformly applied in a straight line pull.
What is breaking strength?
Breaking strength is an average figure under laboratory conditions, in straight line pulls with constantly increasing loads. These conditions are rarely duplicated in actual use. Do not use breaking strength for design or rating purposes, use working load limit (wll) figures.
What is shock load?
Loads which exceed the static load caused by rapid change or movement, such as jerking, impacting, or swinging of loads. Working load limits (wll) will not apply. Think Giant Swing, Power Pole and Zip Lines – any jumping element.
What does NFPA, ANSI, CSA, and CI approval mean?
- NFPA stands for National Fire Protection Association. NFPA standards are based on industry consensus and voluntary compliance. NFPA 183 standard on fire service, life safety rope and system components, sets standards for rope rescue equipment.
- ANSI stands for American National Standards Institute.
- CSA is the Canadian Standards Association. ANSI and CSA are industry organizations, made up of manufacturers and consumers. They test products for performance standards. Meeting the standards indicates that the products have passed accepted testing procedures. These standards are not enforceable as law. However, many OSHA regulations, which are enforceable as law, have been adopted from ANSI standards.
- CI stands for Cordage Institute. This is an association of rope manufacturers that work to develop cordage standards for rope specifications and performance.
What is the difference between static and low-stretch rope?
Static ropes have less than 6% elongation, when measured at 10% of their minimum breaking strength. Low-stretch ropes have a 6-10% elongation, when measured at 10% of their minimum breaking strength. Static ropes are best for situations, which demand high strength and stable positioning, without creep. Low-stretch ropes may be more appropriate. where impacts are likely. Dynamic Ropes must be used where constant impact will occur or impact is always part of the activity. Power Pole or other jumping activities.