Part 313233,34,35,36 of GB/T 18380 specifies a test method for evaluating the ability of vertically installed bunched wires, cables, or optical cables to suppress vertical flame propagation under specified conditions. Note: The term "wire and cable" in this section includes all metal conductor insulated cables used for energy or signal transmission. This part of GB/T 18380 details the testing equipment, its arrangement, and calibration. 2 Normative References: The clauses in the following documents are referred to as clauses in this part of GB/T18380. For dated reference documents, all subsequent amendments (excluding corrected content) or revisions do not apply to this section. However, parties to agreements based on this section are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest version applies to this section. GB/T16499-1996 Guidelines for the Preparation of Electrical Safety Standards (eqv IEC Guide 104; 1984) IEC 60695-4:1993 Fire Hazard Testing Part 4: Fire Testing Terminology 3 Definitions This part of GB/T 18380 uses the following terms and definitions. 3.1 Ignition source is the energy source that triggers combustion. [IEC 60695-4:1993, Definition 2.76] 4 Test environment: If the external wind speed measured by the anemometer installed at the top of the test chamber is greater than 8 m/s, the test should not be conducted. If the temperature of the inner wall is below 5 ℃ or above 40 ℃, the test should not be conducted. The temperature of the inner wall is measured at the intersection of 1500 mm from the upper part of the box bottom plate, 50 mm from one side of the wall, and 1000 mm from the door. The door of the test chamber should always be closed during the test