EVCOME EV charging stations for better life---Top EV charging stations manufacturers & suppliers in China.
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EVCOME EV charging stations for better life---Top EV charging stations manufacturers & suppliers in China.
Mineral insulated fire-resistant cables are used as the power transmission of fire-fighting systems in construction projects, and have high requirements for their safety and reliability; Know how to twist your head; how to distinguish the authenticity of fireproof cables? 1. Mineral cables. Now the civil building fire protection design code requires that fire system cables use mineral insulated cables. According to the structure, they are divided into rigid mineral insulated copper sheathed cables and flexible mineral insulated copper sheathed cables. In China, they are also called fireproof cables, with annealed copper as the conductor. Dense magnesium oxide acts as insulation. Annealed copper tube as sheath for the cable. If necessary, extrude a plastic outer sheath outside the annealed copper sheath. In smoke-free and halogen-free occasions, a layer of low-smoke and halogen-free sheath can be added. 2. Identification of mineral insulated fireproof cables. 1. The rated voltage of mineral insulated cables above 500/750V belongs to the scope of production license and does not belong to the scope of 3C certification. 3C certification refers to wires and cables with a voltage level below 450/750V750V, and the national compulsory certification, so you can see whether there is a wire and cable production license item on the business license of the enterprise. 2. Mineral insulated cables have a special quality certification department of the National Wire and Cable Quality Inspection Center. Relevant mineral cable manufacturers should actively produce qualified test reports when users order mineral insulated cables. 3. At present, only BTTZ and YTTW have national standards among mineral cable models, and the rest only have industry standards or enterprise standards. 4. Due to the high technical content of mineral insulated cables, especially BTTZ mineral insulated copper core copper sheathed cables, which adopt copper tube drawing and annealing technology, only a few large cable enterprises in China can produce them, so it is best to visit the production line. 5. Check whether it has passed the highest standard test of British BS6387CWZ, which belongs to the international standard of mineral insulated cables. 6. Generally, from the perspective of cable structure, mineral cables need metal sheaths, and only BBTRZ flexible mineral cables do not contain metal sheaths. 3. Present situation of mineral insulated cables. To distinguish the quality of mineral insulated cables, users first need to improve their understanding of mineral cables, not just look at the surface information; understand important information such as cable companies and their reputation in the cable industry from the side, do not be greedy for cheap, cable prices are daily According to copper price fluctuations; especially if the price of mineral cables is lower than the market price, the so-called penny; if the quality is not up to standard, future safety risks will be buried, and the consequences will be more serious. .
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