Fire resistant cables are widely used in high-rise buildings, subway, underground streets, large power stations, important industrial and mining enterprises and other places related to fire safety and fire rescue, such as power supply lines and control lines of emergency facilities such as fire-fighting equipment and emergency guide lights.            3. Fire resistant cable refers to the cable that can keep safe operation for a certain time under the condition of flame combustion. According to the national standard gb12666.6 (equivalent to iec331), the fire resistance test is divided into two levels: A and B. the flame temperature of a is 950-1000 ℃, the continuous fire supply time is 90min, and the flame temperature of B is 750-800 ℃, the continuous fire supply time is 90min. During the whole test, the sample shall bear the rated electric pressure value specified by the product.            Fire resistant cables are widely used in high-rise buildings, subway, underground streets, large power stations, important industrial and mining enterprises and other places related to fire safety and fire rescue, such as power supply lines and control lines of emergency facilities such as fire-fighting equipment and emergency guide lights.            List of glass fiber MICA TAPE PVC composite insulation and fire-resistant power cables            Model voltage product name scope of application fire resistance rating            Nhb-vv 0.6/1kv glass fiber MICA TAPE PVC composite insulation flame retardant PVC sheathed class B fire resistant power cable is fixed and laid in indoor, tunnel, bracket and pipeline places requiring flame retardant and fire resistance. Long term working temperature of cable conductor shall not exceed + 70 ℃, laying temperature of cable shall not be lower than 0 ℃, bending radius of cable shall not be less than 20 times of outer diameter of cable gb12666.6            (equivalent to iec331)            Nhb-kvv22 glass fiber MICA TAPE PVC composite insulation flame retardant PVC sheathed steel tape armored class B fire resistant control cable. It is the same as nhb-kvv, which is used in the place that can bear the external mechanical force. The bending radius of the cable shall not be less than 15 times of the outer diameter of the cable. Gb12666.6 (equivalent to iec331)            Level B            Nha-kvv22 glass fiber MICA TAPE PVC composite insulation flame retardant PVC sheathed steel tape armored class a fire resistant control cable. It is the same as nhb-kvv22, which is used in places requiring severe fire resistance. GB12666.6            Structure and performance            The structure and performance of glass fiber MICA TAPE PVC composite insulation and fire-resistant power cable shall refer to gb12706 copper core and aluminum core plastic insulated power cable with rated voltage of 35kV and below (equivalent to iec502).            The structure and performance of glass fiber MICA TAPE PVC insulated fire-resistant control cable shall refer to gb9330 plastic insulated control cable (equivalent to iec227) and gb12706 copper core and aluminum core plastic insulated power cable with rated voltage of 5kV and below (equivalent to iec502).            Fire resistance characteristics            The cable passes gb12666.6 test method for fire resistance characteristics of wires and cables (equivalent to iec331)            Class A (flame temperature 950 ~ 1000 ℃, continuous fire supply time 90min)            Class B (flame temperature 750-800 ℃, continuous fire supply time 90min)            According to the user's requirements, it can pass the fire resistance test according to any standard of gb12666.6 A and B.            Flame retardancy            The cable passes gb12666.5 flame test method for bunched wires and cables (equivalent to iec332-3)            Class A (the combustible volume of the sample shall be 7L / m, and the flame duration shall be 40min)            Class B (the combustible volume of the sample shall be 3.5l/m, and the flame duration shall be 40min)            Class C (the combustible volume of the sample shall be 1.5l/m, and the flame duration shall be 20min)            According to the user's requirements, the maximum rated working temperature of conductor through bunching combustion test of cable shall not exceed 250 ℃ according to gb12666.5 a, B and C standards or American ieee383 standards and Japanese JIS standards; when laying            Allowable bending radius: single core cable shall not be less than 20 times of cable outer diameter; multiple            Core cable shall not be less than 12 times of cable outer diameter. Ambient temperature of cable during laying            Under the condition that the temperature is not lower than 0 ℃, no pre heating is required.            In order to build a market environment of honest operation and fair competition, strengthen the construction of quality and honesty system, effectively ensure product quality, safeguard the legitimate rights and interests of consumers, and promote the construction of a "quality power", the company solemnly promises to the whole society:            1、 Firmly establish the idea of "quality first", constantly enhance the quality awareness and social responsibility, ensure and improve product quality, implement the main responsibility of enterprise quality, meet the people's expectation and demand for high-quality products, and enhance the people's consumption confidence.            2、 Strictly abide by laws and regulations, such as product quality law, standardization law and measurement Law, strictly implement product standards, do not make or sell fake products, put an end to false propaganda, resolutely resist dishonest and illegal acts such as fake and shoddy products, cheat consumers, and do not infringe the legal rights and interests of other enterprises.            3、 Strengthen the quality management of the whole staff, whole process and all-round way, carry out advanced quality management methods, improve the measurement assurance system, standardization system and quality assurance system, and strictly control the quality of raw materials, production process, product delivery, storage, transportation and sales in the whole process.            4、 Establish an active reporting system for quality and safety accidents, strictly implement the accountability system for quality and safety, improve the product quality traceability system, timely solve quality complaints from consumers, and consciously fulfill product quality responsibilities and obligations such as product quality recall and "Three Guarantees".            The unit shall strictly fulfill the above commitments. In case of any violation, it is willing to bear the corresponding legal responsibility, accept the illegal act of dishonesty into the bad credit record and publicize it to the society.            Commitment unit: No.1 Branch of Tianjin Cable Factory.            Production table of No.1 Branch of Tianjin Cable Factory            Mining communication cables: mhyv, MHYVR, mhyvp, mhyvrp, mhyav, mhya32, mhy32, mhjyv, mhybv, etc            Mine control cables: mkvv, mkvvp, mkvv22, mkvv32, mkvv32, mkyjvr, mkvyp, mkyjv22, mkyjv32, mkyjv32, mkyjvr, etc            Mining rubber sleeve cable: my, MYP, myq, MC, MCP, UGF, ugefp, myptj, mcptj, etc            Mining power cable: MVV, mvv22, mvv32, MYJV, myjv22, myjv32, etc            Computer cable: djyvp, djypvp,