Why flexible mine insulated fire resistant cable have good fire resistantance performance?
Superior high temperature resistance and fire resistance performance
General wire and cable insulation due to the use of organic polymer materials are therefore highly carbonized under fire conditions and thus lose insulation. Flexible mine insulated fire resistantant cable main materials is mineral compounds, which in itself does not cause a fire, can not burn or support combustion. These materials generally have a higher melting point above 1500 ℃, so even for fire resistant cable under fire conditions can also play a normal transmission function, it is a real fire cable sense. And through the BS6387 C, W, Z test.
Flexible mine insulated fire resistantant cable is truly achieve the effect of burn will not lead to short-circuit, short-circuit does not burn, it can supply power normally in burst fire environment, gain time for field personnel to escape, provide electricity to rescue and start fire-fighting equipment, reduce fire losses and personnel casualties; Secondly, good conductivity copper sheath, do PE ground wire connection, greatly improving the sensitivity and reliability of grounding protection.
Flexible mine insulated fire resistantant cable ampacity is large, and has a strong circuit overload, according to the relevant electrical design requirements that cable surface temperature is usually not higher than 70 ℃, if there isn’t combustibles around, Flexible mine insulated fire resistantant cable long-term working temperature can reach overload 250 ℃.
Good bending characteristics
Traditional rigid fire resistant cable (BTTZ) is more difficult to curved use, Flexible mine insulated fire resistantant cable minimum bend radius is 6 to 10 times of the diameter of the cable, reducing installation space layout, reducing installation costs, easier installation.
Flexible mine insulated fire resistantant cable use inorganic mineral insulating material as insulation, compared with conventional organic insulated cables (YJV, VV), it isn’t impacted by irradiation, the material does not deteriorate, and insulating properties will not change; at the same time as the cable sheath copper emboss form, with excellent sealing, moisture, corrosion, cable service life of up to 70 years.
Flexible mine insulated fire resistantant cable construction materials are made of inorganic mineral materials, cables burning flame, does not release smoke, does not release toxic gases; cable can also be abandoned after all the recycling, will not pollute the natural environment.
Continuous production longer length
As a result of continuous mechanized production, whether single core or multi-core cable, the length of cable can satisfy the power supply required length, continuous lengths up to 1000m or more, without intermediate connection point, greatly reducing the project due to the connection point line potential safety problems.
For users to reduce investment costs
The directly purchase cost of metal sheathed flexible mine insulated fire resistantant cable is less than traditional rigid fireproof cable (BTTZ), product cost performance is higher. Copper sheath can be used as PE grounding wire; use 4-core cable instead of 5-core (YJV) cable, the price difference is much smaller. Metal thread jacket has a certain self-supporting capability, can be laid directly, eliminating the need to wear tube, bridge and other installation accessories, saving installation costs.