Introduction to the Fire-Resistant Performance of Mineral-Insulated Fireproof Cables
Release date:
2022-06-16 15:23
Source:
Among many Mineral-insulated fire-resistant cable Among them, BTTZ mineral-insulated cables with magnesium oxide insulation undoubtedly boast excellent fire-resistant performance. These fireproof cables feature a structure consisting of copper cores surrounded by magnesium oxide insulation layers, encased in a sheath made of pure copper—though the type of sheath can be chosen according to preference.
The copper-core, copper-sheathed, magnesium oxide-insulated BTTZ fire-resistant cable features a seamless copper tube, with tightly packed magnesium oxide powder used for insulation. This design prevents flammable gases, oil vapors, and flames from reaching the electrical equipment connected to the cable, giving the cable its explosion-proof characteristics.
In terms of material properties, copper has a melting point of 1,083°C, while magnesium oxide boasts a much higher melting point of 2,800°C. Testing has shown that mineral-insulated fire-resistant cables can operate normally for up to 3 hours at temperatures as high as 1,000°C, during which they remain resilient against intense water jets and heavy-impact forces. This exceptional safety and fire resistance significantly enhance the protection of personnel, while also effectively minimizing property damage in the event of a fire.
The voltage resistance level can reach up to 1,000V, significantly reducing the surge voltages caused by frequent inductor and variable-frequency appliance startups, thereby greatly extending the service life of the wiring system.
As users and designers, you might choose mineral-insulated fire-resistant cables because they come with a unified national standard, ensuring reliable performance, safety, and high quality—plus, there’s no liability involved.
Whether in factories or buildings, electrical circuit safety is absolutely critical. According to statistics from relevant national authorities, fires caused by electrical wiring account for more than 50% of all fire incidents. As a key component of wiring systems, cables are particularly challenging to protect. Therefore, to ensure the reliable safety of buildings, cables must possess the ability to withstand external flame damage—and they should also be designed to prevent the generation of ignition sources altogether.
Mineral-insulated fire-resistant cables, as a type of rigid mineral-insulated cable, are primarily made with metallic copper as the conductor. The insulation layer is composed of inorganic magnesium oxide, while the metal sheath surrounding the copper conductor is also entirely inorganic. As a result, even in cases of overload or short circuit, these cables remain free from open flames, ensuring that circuits equipped with mineral-insulated fire-resistant cables cannot ignite fires. Moreover, if a fire does break out for other reasons, these cables can continue to supply power reliably for up to 3 hours under high-temperature conditions ranging from 950°C to 1000°C—and even maintain normal operation briefly at temperatures close to the melting point of copper (1083°C)—while emitting neither smoke nor toxic gases. This unique characteristic guarantees the seamless activation of firefighting equipment, effective fire suppression, and safe evacuation of personnel.
As relevant national authorities progressively raise the requirements for fire resistance ratings of building materials, the application of mineral-insulated fire-resistant cables will gradually replace traditional cables. The main power supply lines for fire protection systems should exclusively use mineral-insulated fire-resistant cables. Moreover, for residential buildings that are 100 meters tall or have 35 stories or more, the power distribution trunk lines serving fire protection systems must also adopt mineral-insulated cables—this is a mandatory requirement. This clearly demonstrates, from another perspective, the growing recognition of mineral-insulated fire-resistant cables by both the national government and the industry.
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