I. Introduction
In the improvement of the manufacturing process of low-smoke and halogen-free cables, it is necessary to measure the temperature of the cable core to obtain an accurate thermal step temperature response curve of the cable. According to the curve, obtain the key factors that affect the performance of the low-smoke halogen-free cable, thereby improving the structure and materials of the low-smoke halogen-free cable, and improving the production process of the low-smoke halogen-free cable. Further improve the flame retardancy and safety of low-smoke halogen-free cables [1].