RH - 6038 IEC standard into a bundle of wire and cable combustion test cases
A. Product introduction
RH - 6036 IEC standard into a bundle of wire and cable combustion test cases by the test chamber, control system, air source, ignition source traffic control system (propane gas and air compressed gas), stainless steel ladder, smoke purification device, etc. Used to evaluate the vertical installed into a bunch of wires or cables under prescribed conditions inhibit vertical flame spread ability test equipment.
2. Standard
IEC 60332-3-10, GB/T 18380.31 "cable under the condition of flame combustion test 31 parts: vertical installation into flame wire and cable vertical spread test test device"
IEC 60332-3-21, GB/T 18380.32 the cable and optical fiber cable under the condition of flame combustion test section 32: vertical installation of vertical spread into flame wire and cable test AF/R class"
IEC 60332-3-22, GB/T 18380.33 the cable and optical fiber cable under the condition of flame combustion test section 33: vertical installation of vertical spread into flame wire and cable test class A
IEC60332-3-23, GB/T 18380.34 the cable and optical fiber cable under the condition of flame combustion test parts: 35 vertical installation of vertical spread into flame wire and cable test class B
IEC60332-3-24, GB/T 18380.35 the cable and optical fiber cable under the condition of flame combustion test parts: 35 vertical installation of vertical spread into flame wire and cable test class C
IEC60332-3-25, GB/T 18380.36 the cable and optical fiber cable under the condition of flame combustion test parts: 35 vertical installation of vertical spread into flame wire and cable test class D
GB/T 19666 "general principles of the flame-retardant and fire-resistant wire and cable standards requirements given in table 4
EN 50399 test standard cable heat release rate
3. The structure/function
1. The test cases:
Box: experimental apparatus should be a (1000 + 100) mm wide, deep (2000 + 100) mm, and high (4000 + 100) mm test box, the bottom should be above the ground. Test chamber surrounding should be sealed, and the air from the bottom of the front wall (150 + 10) mm opening a (800 +) 20 mm x (400 + 10) mm inlet into the box. Should be at the back of the box at the top of the open a (300 +) 30 mm x (1000 + 100) mm air outlet.
2. Heat insulation protection:
Test chamber of the back wall and side should use heat insulation coefficient of about 0.7 W, m - 2 * K - 1 thermal insulation, 1.5 mm thick of SUS304 stainless steel plate, the intermediate coating 65 mm thick insulation mineral fibre, outside SUS 304 stainless steel plate is 1.5 mm thick. Steel ladder and the distance between the test chamber back wall for (150 + 10) mm, rail on the bottom of the steel ladder (400 + / - 5 mm off the ground. Cable sample lowest place about 100 mm from the ground.
3. The steel ladder type:
Standard steel ladder (500 + 5) mm wide; Wide steel ladder (800 + 10) mm wide; Material as SUS316 stainless round steel;
4. Air source to determine:
Air inlet is equipped with digital display speed anemometer, can directly read out and can adjust by the gas flow of air of the L/min (5000 + 500), stable air flow rate during test.
5. Emissions purification device:
Divided into three parts: spray device, dust filtering device, exhaust device, adopts SUS304 stainless steel material (this is optional).
Spray device: to provide water for special filtering material, maintain special filtering material effectively filter soot.
Dust filtering device: the drinking water of the filter material, can effectively filter the soot discharge of smoke as the white smoke, completely conforms to the requirements of environmental protection, easy to clean and replace, 2 sets and distribution.
Exhaust device: equipped with high power fan, implement mandatory ventilation, and equipped with electric gate can control the velocity of the wind.
6. Control system:
Tank is equipped with independent control system, big screen touch screen display, set system, storage test data, the computer automatically record all set up and test parameters.
Parameter detection function:
A. 1 hour and combustion test time and remind function;
B. air and propane flow monitoring and control;
C. the laboratory temperature measurement;
D. test chamber top wind speed measurement;
E. timing test time.
7. Test conditions measurement device:
Upper test chamber is equipped with digital display anemometer ensure less than 8 m/S wind velocity, wind air flow will not affect the test box.
Ignition source: 8.
Ignition sources should include a one or two type with propane gas burner and flowmeter (rotor flowmeter and mass flowmeter) and venturi mixer (imports). The for fire surface shall be the drill has 242 aperture of 1.32 mm flat metal plate, 3.2 mm hole center distance, in three rows of staggered, 81, 80 and 80 respectively in each row, in nominal size is 257 * 4.5 mm range, in addition the spray fire board on each side open a row of holes, the guide hole can maintain the stability of flame combustion.
Blowtorch: meet the steel ladder and wide steel ladder and the corresponding use of burner, provide (73.7 + 1.68) x 106 j/h (Btu/h (70000 + 1600)) nominal heat.
Mass flowmeter (recommended) : automatic precise control of each burner propane and air flow rate, air: 77.7 + / - 4.8 L/min; Propane (13.5 + / - 0.5 L/min.
Ignition source location:
Burner should be placed, is apart from the cable sample surface before (75 + 5) mm, is apart from the test department (600 + 5) mm, at the bottom of symmetry axis and steel ladder. Burner for point should be located in the center of the steel ladder between two rungs, and at least 500 mm from bottom sample, the center line of the burner system should be consistent with the center line of the steel ladder is roughly.
9. Fire protection system:
Determination of burning test for 1 hour and alarm to remind function, when to stop for 1 hour and samples were still burning, fire use force to stop burning with nitrogen gas fire extinguishing or spray extinguishing equipment.
10. Gas control system:
Gas supply system with tempering limiter
11. Shut down automatically to snuff out protection device:
PLC + MFC to achieve automatic control of ignition and extinction of propane and air supply order.
Adjustable speed fan and anemometer precise control of air inlet velocity.
Ignition time automatic control and ignition stop reminding function.
