Mineral-insulated fire-resistant cables are becoming a new trend.
Release date:
2022-06-26 12:30
Source:
In recent years, with the high-level development of the nation's construction industry, large-scale national key projects and high-rise buildings have placed increasingly stringent demands on building fire protection performance. Therefore, Mineral-insulated fire-resistant cable Its usage is becoming increasingly common.
Mineral-insulated fire-resistant cables, as critical equipment for firefighting and rescue operations, must remain continuously operational. They require dedicated power supply lines that are highly reliable and immune to interruption by external factors. Fire-fighting distribution circuits should ensure uninterrupted power delivery even during a fire. These cables, which fall within specified standards, consist of copper cores insulated with magnesium oxide—a mineral-based material—encased in copper sheaths. Composed entirely of two inorganic materials—copper conductors, magnesium oxide, and a copper outer jacket—mineral-insulated cables are currently the primary choice for applications in China's domestic market.
1. BTTZ Copper-Core Copper-Sheathed Magnesium Oxide-Insulated Fire-Resistant Cable
It is a rigid cable featuring a seamless copper tube sheath on the outer layer, with magnesium oxide crystal powder serving as the insulating material in the middle, and a single copper rod as the conductor (resulting in poor flexibility). BTTZ is a type of rigid mineral-insulated cable that can be manufactured in limited lengths. In practical applications, however, it must often be assembled by joining several or even dozens of shorter cables together, leading to numerous joints. Mineral-insulated fire-resistant cables can withstand continuous operating temperatures of up to 250°C. Moreover, in emergency situations, these cables can continue functioning briefly at temperatures close to the melting point of the copper sheath.
2. BTWTZ Copper-Core Copper-Interlocked Armored Mineral Cable
It consists of copper stranded wires, mineral-based composite insulation, and a special non-flammable copper interlocking armored sheath. Both copper and magnesium oxide—two materials used in mineral-insulated fire-resistant cable applications—are inorganic substances. This type of cable neither ignites nor supports combustion, and it can continue operating even under conditions close to direct flame exposure.
3. BTLY Aluminum-Sheathed Continuous Extruded Mineral-Insulated Cable
The conductor is a circular copper strand, the insulation layer consists of mica tape, and the metallic sheath is a continuously extruded aluminum tube.
In recent years, the market has been flooded with low-quality products, and counterfeit mineral-insulated fire-resistant cables have become increasingly common. Both the product certificates and the cable bodies clearly bear the marking "YTTW," yet this product differs significantly from the familiar mineral-insulated fire-resistant cables in terms of appearance, structure, cross-section, and materials. While the Y copper sheath is made of seamless welded rolled copper, the cable’s name remains identical to that of the well-known mineral cables—raising serious doubts about whether manufacturers are deliberately deceiving consumers.
Mineral-insulated fire-resistant cables vary widely in quality, so how should consumers assess the fire performance of these cables? Without access to a professional combustion laboratory, consumers can start by checking whether the product has a testing report from an authoritative quality certification body. Additionally, it’s important to consider whether the manufacturer possesses its own core technologies and patents, as well as whether they have their own combustion performance testing lab—these factors should all be evaluated comprehensively.
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