Product Name: BG5203-BS Wire and Cable Fire resistance Tester
AddDate: 2014-05-16
Summary:
This tester included fire resistance test, water and fire resistance test, and mechanical shock and fire resistance Test. It applies to mineral insulated cables whose rated voltage is less than 450/750V.
Standards:
BS6387
Technical parameters A. Fire resistance Test, Includes below:
◆ Cable supporting system: Use clip to horizontally clip cable’s sheath. Middle of the cable is fixed by two metal rings (distance of 300mm). ATTENTION: Metal rings and other metal parts should be earthing. For non-armoured cable whose diameter is under 10mm, or some other cables which will happen obvious displacement, should be fixed by 3 metal rings. Each metal ring should be fixed in the original one at a distance of 150 mm.
◆ Continuous detection device: Let current go through all the cores of cable when in test, a three-phase star-shaped connected transformer or three single phase transformers (or one single phase transformer, if test sample is single core cable.), and has enough ability to keep max allowable leakage current of 3A under test voltage. Each core of cable in the other end connects with a lamp, and load current of 0.25A under rated voltage.
◆ Heat source
Heat: Heat is provided by a pipe type gas burner, which can supply methane. Its length is 610mm and fire is dense.
Temperature measurement: An armoured thermometer is placed near the air inlet, whose diameter is 2mm. It’s parallel to the burner and 75mm up it.
Test fire temperature and Time (Refer to BS 6387 burning level)
A 650℃±40℃ -3H
B 750℃±40℃ -3H
C 950℃±40℃-3H
S 950℃±40℃-20Min
◆ Sample: Sample is one section from the finished product, more than 1200mm. Get rid of 100mm sheath and covering layer of both ends. Wires of both ends should be connected according to the electrical connections.
B. Water and fire resistance Test: W, Includes below
◆ Cable supporting system: Cable is connected to the metal support which is consisted of 2 steel plates, width of 25mm. Support is fixed by metal clips, distance of 200mm. ATTENTION: Metal rings and other metal parts should be earthing. Cable connects to the support.
◆ Continuous detection device
Let current go through all the cores of cable when in test, three single phase transformers, and has enough ability to keep max allowable leakage current of 3A under test voltage. Each core of cable in the other end connects with a lamp, and load current of 0.25A under rated voltage.
◆ Heat source
Heat: A strip burner whose length is 400mm. It can be adjusted and can provide bright flame. Temperature: 650℃±40℃.
Temperature measurement: An armoured thermometer is placed in the lower surface of cable.
Test flame temperature: 650℃±40℃.
◆ Water spray: A spray noozle (see pic-4) is installed on the test support (see pic 2, 3), just middle of the burner. Water pressures: 250KPa~350KPa. Spray water 0.25L/m2~0.30L/m2around sample. This spraying rate needs to use collection tray to measure. This tray has enough depth, to let its long axis parallel to the axis of the cable and in the middle place. It’s about 100mm in width, 400 in length.
◆ Sample: Sample is one section from the finished product, more than 1500mm. It must have been done the bending test in environmental temperature. Get rid of 100mm sheath and covering layer of both ends. Wires of both ends should be connected according to the electrical connections.
◆ Test voltage: 200~1000V, adjustable.
C. Mechanical shock and fire resistance Test, Includes below
◆ Cable is fixed on a vertical wall, with a heat resistance non-combustible material, fixed on two horizontal steel plates. One is upper of the plate, and the other bottom of the plate. This plate is about 900mm in length, 300mm in width, 9mm in thickness, and total weight of the wall (plate + support) is about 10 ± 2 kg. Each steel girder is square steel tube of 1m in length. If need filling materials, then need to put them inside the steel girders. Customers must fix the upper steel girder to the plate, to make its upper surface and plate’s upper surface parallel and level. There’s a horizontal hole of each steel girder and plate’s outer edge, its accurate position should be decided by specific support gasket and support framework requirements. The wall is bond to the framework by 4 rubber bushings. Bushing of diameter about 32mm, thickness about 20mm.
◆ Transformer is connected to fuse and lamp, used to indicate that circuit is constant
Let current go through all the cores of cable when in test, three single phase transformers, and has enough ability to keep max allowable leakage current of 3A under test voltage. Each core of cable in the other end connects with a lamp, and load current of 0.25A under rated voltage.
◆ Shock device: It’s a low carbon steel rod, diameter of 25mm± 5%, length of 600mm± 5%. Its vertical section is parallel to the wall, over the top of wall 200mm. An axis divides it into two parts of 200mm and 400mm. The longer part towards the wall. (See pic-5) Apart 30±2S, drop to the middle of the wall from the parallel position since 60°C.
◆ Heat source
Heat: A strip burner whose length is 400mm. It can be adjusted and can provide bright flame. Temperature: 650℃.
Temperature measurement: An armoured thermometer, diameter of 2mm. (See pic-6) It through the wall about 8~10mm. Temperature is measured by below: Attach a thermometer of one end of the low carbon steel rod, to make it measure rod’s temperature. Catch this rod to the flame, keep the distance of 40~50mm. When the flame temperature is 950°C, steel rod’s temperature can reach 400°C in 10~20s; when flame temperature is 650°C, steel rod’s temperature can reach 400°C in 20~40s.
Test flame temperature and time: Choose from below
X 650±40℃
Y 750±40℃
Z 950±40℃
◆ Sample: Sample is one section from the finished product, more than 1200mm. Get rid of 100mm sheath and covering layer of both ends. Wires of both ends should be connected according to the electrical connections. Cable needs to be bent from the middle into two sections, close to isometric, parallel parts. Diameter of bending part is 6D, D means cable’s outer diameter. Make the cable to “Z” shape. Distance of two ends fix places is 13D. Cable should be fixed on the wall with copper clips, special cable’s installation should refer to manufacturer. Clips need to fix on cable’s two bending parts, middle of the bending part is vertical. In the part of cable turns into horizontal parts, distance between clips is 150~200mm.
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