Professional Answer: The term "cable laying factor" refers to the various environmental and installation conditions that influence a power cable's ability to dissipate heat. These factors are critical because they directly determine the cable's ampacity, or maximum current-carrying capacity. During electrical construction, the heat generated by current flow (I²R losses) must be effectively dissipated into the surrounding environment. If heat dissipation is restricted, the cable's temperature will rise, potentially damaging the insulation, shortening its lifespan, and causing system failures. Therefore, correctly assessing and applying these derating factors is essential for ensuring the safety, reliability, and longevity of any power line installation. Ningbo Changshi provides specialized equipment to help technicians manage these factors and achieve optimal installation conditions.