Scope of application: It is used to evaluate the ability of vertically installed bundled wires and cables or optical cables to inhibit the vertical spread of flames under specified conditions, and the use process needs to cooperate with smoke dust removal towers. The whole machine is composed of several parts, such as a test chamber, an air source, a steel ladder, an emission purification system, and an ignition source.
Conform to the standard: in accordance with GB/T18380.31-2008, IEC60332-3-10-2018 "Combustion Test of Cables and Optical Cables under Flame Conditions Part 31: Vertically Installed Bundled Wire and Cable Flame Vertical Spread Test Device" can meet the requirements of GB/T18380.32-2008/IEC60332-3-21:2000 Flame test of cables and optical cables under flame conditions Part 32: Flame vertical spread test of vertically installed bundled wires and cables A F/R class", GB/T18380.33-2008/IEC60332-3-22:2000 "Flame Burning Test of Cables and Optical Cables under Flame Conditions Part 33: Flame Vertical Spread Test of Vertically Installed Bundled Wires and Cables - Class A", GB/T18380.35-2008/IEC60332-3-24:2000 Flame test of cables and optical cables under flame conditions Part 35: Flame vertical spread test of vertically mounted bundled wires and cables Category C", GB/T18380.36-2008/IEC60332-3-25:2000”Flame test of cables and optical cables under flame conditions Part 36: Flame spread test of vertically mounted bundled wires and cables Category D".
Technical Parameters:
- Test chamber: The experimental device should be a self-supporting chamber with a width of (1000±100) mm, a depth of (2000±100) mm and a height of (4000±100) mm. The back wall and both sides of the test chamber should be made of heat transfer coefficient of about 0.7W?m-2? K-1 thermal insulation, 1.5mm thick USU304 stainless steel plate, 65mm thick insulation mineral fiber in the middle, 1.5mm thick USU304 stainless steel plate outside
2. Air source:
The air inlet is equipped with a digital air velocity anemometer, and the gas flow rate of the air is (5000±500) L/min.
After the test is completed: if the sample is still burning for one hour after stopping the fire, there is an alarm and a device to forcibly stop the combustion by rain.
3. Steel ladder type: wide (500±5) mm standard steel ladder (800±10) mm wide steel ladder made of USU304 stainless round steel
4. Discharge purification device:
The upper part of the test chamber is equipped with a digital anemometer to ensure that the flow rate of the wind is less than 8M/S, which will not affect the air flow in the test chamber.
Smoke collection and washing device: SUS304 stainless steel, diameter 800mm, height 3500mm.
Ignition source
1. Type: The ignition source should include one or two belt propane gas blowtorches and their supporting flowmeters and venturi mixers. The surface of the fire should be drilled with 242 flat metal plates with a diameter of 1.32 mm, the center distance of these holes is 3.2 mm, and they are staggered in three rows, each row is 81, 80 and 81, distributed in a range of 257×4.5 mm nominal size. In addition, a row of small holes are cut on each side of the flamethrower, and these pilot holes can keep the flame burning steadily. Each blowtorch should be equipped with an accurate device to control the rate of propane and air inflow. Rotameters or mass flow meters can be used
2. The blowtorch at the ignition source should be placed horizontally, (75±5) mm away from the front surface of the cable sample, (600±5) mm from the bottom of the test chamber, and symmetrical with the axis of the steel ladder. The ignition point of the blowtorch should be located in the center between the two rungs of the steel ladder and at least 500mm away from the lower end of the specimen.
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