Cable lube reduces the friction between the cable and duct walls by as much as _______%.

Cable lube is specifically designed to minimize the friction that occurs when a cable is pulled through duct systems. The application of cable lube creates a slippery interface between the cable and the duct walls, which allows for easier installation and reduces the risk of damage to the cable. The correct answer reflects a significant reduction in friction, indicating that using cable lube can decrease overall resistance by as much as 70%. This substantial decrease contributes not only to smoother installations but also helps prolong the life of the cables by preventing wear and stress caused by friction.

While lower percentages indicate some reduction in friction, they do not capture the degree of efficiency and effectiveness provided by cable lube, which is demonstrated by the highest stated reduction. Understanding this can help professionals make informed choices about materials and methods in cable installation processes.