GB/T 18380.31 - 2022 focuses on the device specification for vertical flame spread test of vertically installed bundles Wire and cable. The standard details the various types of devices suitable for such tests, including combustion tanks, and sets requirements for their size, structure, material and thermal insulation performance to ensure a stable and standard-compliant combustion environment. Specifies the fire source equipment, such as the type of combustion device, Power, flame size and adjustment accuracy. It also explains auxiliary equipment, such as ventilators, smoke exhaust systems, etc. Through the unified test device standard, it provides a reliable hardware basis for subsequent cable combustion tests, and ensures the accuracy and comparability of test results.