GB/T 18380.32-2022 A F/R type flame vertical spread test for vertical installation of bundles of Wires and cables. It clarifies the test principle, specifies the structure and flame parameters of A F/R type special combustion equipment, and details the selection and installation of the sample. Standardize the test process, such as precise control of the ignition time and comprehensive observation of the flame spread process. Through this standard, the vertical spread characteristics of such cables under specific flames can be accurately evaluated, providing a unified test basis for cable production and related industries, helping to improve the flame retardant performance of cables in fire scenarios, and ensuring the safety of power communication systems.