The replacement interval for lift cables (elevator or vehicle lift wire ropes) is governed by both usage volume and time-based safety standards. In many jurisdictions and under industry standards like BS 7980, it is recommended to replace load-suspension wire ropes every six to ten years, regardless of their visual appearance. This is because internal degradation, such as "fatigue breaks" in the inner wires or corrosion from the inside out, often cannot be seen during a standard external inspection. For high-traffic commercial elevators, the frequency is often determined by a "routen" or trip count rather than years. Maintenance professionals perform "magnetic flux" testing or physical diameter measurements every six months; if a cable has lost more than 5% to 10% of its original diameter or shows more than a specific number of visible broken wires per "lay length," it must be retired immediately. Environmental factors like humidity, salt air, or lack of proper lubrication can significantly shorten this lifespan, making regular professional inspections the only way to ensure the safety of the lifting system.