Instructions for Use and Features of Accessories for Mineral-Insulated Fireproof Cables
Release date:
2022-08-09 11:31
Source:
Mineral-insulated cable, often abbreviated as MI cable, is commonly referred to in China as magnesium oxide cable or fire-resistant cable. It features copper conductors, excellent insulation properties, insulation made from magnesium oxide mineral powder, and a copper sheath as its protective covering. Mineral-insulated fire-resistant cable What are the instructions for use and the features of the attachment?
1. All components of the cable are inorganic, offering advantages such as fire resistance, high-temperature tolerance, corrosion resistance, waterproofing, explosion-proof properties, halogen-free and non-toxic characteristics, as well as large current-carrying capacity. As people’s living standards and fire safety requirements continue to rise, the safety standards for buildings are becoming increasingly stringent. Thanks to these outstanding features, mineral-insulated fire-resistant cables are being increasingly adopted in a wide range of construction projects.
2. Requirements for Devices and Accessories: Mineral-insulated fire-resistant cables utilize new materials and advanced manufacturing processes, setting them apart significantly from conventional wire, cable, and device technologies. Detailed specifications should be established for both intermediate and final-stage connection processes to ensure the safe and reliable operation of mineral insulation. Rigorous control measures must also be implemented to guarantee that the quality level of the installation meets high-quality standards.
3. Scope of Application: Suitable for copper-core, copper-sheathed mineral-insulated cable installations in industrial, residential, and defense-oriented buildings with rated voltages of 750V and below.
4. Installation Process: The installation process for mineral-insulated fire-resistant cables is based on connecting the manufactured cables and their corresponding specialized accessories—such as terminal fittings, intermediate connection accessories, sealing insulation fittings, and curing accessories—into a safe, reliable, fire-resistant, high-temperature resistant, mechanically robust, corrosion-resistant, and explosion-proof cable system, strictly following the prescribed process procedures and operational guidelines.
What are the conceptual differences among various mineral-insulated fire-resistant cables?
1. Currently, China does not yet have a corresponding national standard defining insulated and fire-resistant cables. In the cable industry, cables with certain fire-retardant properties—such as flame-retardant cables, fire-resistant cables, and mineral-insulated non-combustible cables—are commonly referred to as "fireproof cables." Among these, flame-retardant cables are those equipped with standard fire-retardant capabilities.
2. The flame-retardant effect of insulated cables refers to the ability, under standard test conditions, for the flame to spread only within a limited area on the sample and then self-extinguish once the ignition source is removed—effectively inhibiting or delaying the occurrence or propagation of fire. Fire-resistant cables, meanwhile, are cables equipped with conventional fire-resistance capabilities.
3. The fire-resistant function of insulated cables refers to their ability to maintain operation under specified conditions when exposed to a controlled fire source for a given duration—specifically, their capacity to uphold the integrity of the circuit.
4. Mineral-insulated fire-resistant cables consist of a copper core, mineral insulation material, and a metal sheath made of copper or other metals. They not only exhibit excellent conductivity as well as superior mechanical and physical properties but also boast outstanding non-combustibility. Under fire conditions, these cables can reliably maintain power supply for firefighting operations throughout the duration of the blaze, while simultaneously preventing the fire from spreading further and minimizing smoke generation. When installing flame-retardant or fire-resistant cables in cable shafts and trenches, there is no need to encase them in metal conduits or opt for enclosed metal cable trays for maintenance purposes. In contrast, when using mineral-insulated, non-combustible cables, they can even be installed directly exposed without additional protection. Furthermore, if fire-rated distribution circuits are laid alongside other power distribution lines within the same cable shaft or trench, it is essential to choose mineral-insulated, non-combustible cables to ensure safety and reliability.
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