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Explosion-proof cable specifications and explosion-proof cable use characteristics
2022-02-17
At present, with the rapid development of China's industrial automation, explosion-proof cables in the production process as communication, monitoring, detection, alarm and control system power supply equipment, explosion-proof power supply is mainly used in coal mines, petroleum, chemical industry, textiles and coal mines, etc., containing a mixture of environments. What kind of cable is called "explosion-proof cable"? That is, the line short circuit or electric spark, but not enough to ignite the surrounding flammable and explosive gases, such a circuit is called intrinsic explosion-proof safety circuit, the cable used is called "explosion-proof cable". Explosion-proof cable is characterised by low capacitance, not easy to store charge, good shielding performance and anti-static properties. Explosion-proof safety power circuit must meet the requirements of explosion-proof safety circuit standards, explosion-proof safety products and standards have formed a more complete system.
Explosion-proof cable manufacturers are many, their quality varies. Customers to buy explosion-proof cable, you must ask the manufacturer (cable sales company) for drawings, or explosion-proof cable used in the environment, and the occasion of a detailed description, so as not to cause economic losses.
Explosion-proof cable varieties of control cables, signal cables, computer cables, coaxial RF cables and other IA levels. In the normal operating state, the existence of a fault or two faults in the circuit can not ignite the explosive gas mixture. In IA type circuits, the working current is limited to less than 100mA, which is suitable for use in chemical industry, oil refining, ships and so on.
Class IB: Under normal operating conditions and with one fault in the circuit, the explosive gas mixture cannot be ignited. In IB circuit, the working current is limited to below 150mA, which is suitable for mining and explosion-proof equipment.
Another type of explosion-proof cable is used for coal mine flame retardant explosion-proof cable, must hold the mining product safety mark certificate of the product, m grade: products coal mine power cable, coal mine signal cable, coal mine coal miner cable, coal mine steel wire armoured cable, coal mine steel wire braided cable, etc., suitable for use in coal mines underground, straight, inclined shafts, shafts and so on.
One of the advantages of the shielded integrated cabling system is: the transmission performance of the core wire is not affected by the surrounding environment, because the shield plays a role in blocking, it makes the core wire only with the shield electromagnetic coupling, and the shield and the outside metal objects between the distribution capacitance of the core wire has nothing to do. In this way, super six shielded twisted-pair cable in the installation only need to install the acceptance criteria for integrated wiring systems (national standards) can be installed, do not have to consider whether the surrounding large metal objects will have an impact on the twisted-pair problem.