What makes mineral-insulated fire-resistant cables superior?
Release date:
2022-07-20 11:17
Source:
Mineral-insulated fire-resistant cables offer advantages that other cables simply cannot match:
Prevent fires
Because Mineral-insulated fire-resistant cable Entirely composed of inorganic materials—metallic copper and magnesium oxide powder—it poses no fire risk, as it cannot ignite or support combustion. This is because copper has a melting point of 1083°C, while magnesium oxide melts at an impressive 2800°C. As a result, even under extreme heat conditions close to copper’s melting point—and during a fire—this cable can still maintain reliable power supply, making it a truly fire-resistant solution. Currently, it stands out as the only type of electrical cable capable of sustaining power for up to three hours in a 1000°C fire, while also enduring the impact of firefighting water jets and heavy objects falling onto it.
High current-carrying capacity
Magnesium oxide insulation material has a thermal conductivity significantly higher than mica and organic insulation materials, offering excellent heat dissipation. Therefore, for cables with the same cross-sectional area, mineral-insulated fire-resistant cables can carry much greater current compared to mica-insulated and organic-insulated cables. Additionally, according to national regulations governing fire protection circuits, flame-retardant and fire-resistant organic-insulated cables installed openly must be enclosed in metal conduits or protected by closed cable trays. In contrast, mineral-insulated fire-resistant cables can be directly laid openly without such restrictions. As a result, mineral-insulated cables allow for a smaller capacity derating factor compared to organic-insulated cables, naturally reducing the required cross-sectional size. For circuits larger than 16 mm², at least one additional cross-section can be eliminated; and in areas where direct human contact is prohibited, even two cross-sections can potentially be saved.
Excellent waterproof performance
Mineral-insulated fire-resistant cable is a truly waterproof product, made from a seamless copper sheath and copper tubing that completely blocks water molecules from penetrating.
Explosion-proof
Mineral-insulated fire-resistant cables feature a seamless copper sheath made of copper tubing, tightly packed with magnesium oxide powder. This design prevents flammable gases, oil vapors, and flames from reaching the electrical equipment connected to the cable, giving the cable its explosion-proof properties.
High-temperature resistance
Mineral-insulated fire-resistant cables can operate continuously and reliably at high temperatures of 250°C, and even withstand short-term exposure to nearly copper's melting point—1083°C. Notably, the magnesium oxide insulation material retains all its performance characteristics under these extreme conditions. This unique feature makes it ideal for use in high-temperature environments such as metallurgy and cement industries.
Mechanical Damage Resistance
Mineral-insulated fire-resistant cables feature conductors and metal sheaths that possess both strength and flexibility. A key advantage of magnesium oxide is that it becomes highly compressed during the cable manufacturing process, seamlessly integrating the conductor, sheath, and insulation into a dense, unified structure. As a result, when the cable undergoes deformations such as impact bending, flattening, or twisting, the sheath remains intact, and the relative positions of the core wires—and between the core wires and the sheath—stay unchanged. This prevents short circuits and ensures that the cable’s electrical performance is not compromised.
Overload resistor
Mineral-insulated fire-resistant cables use magnesium oxide as insulation, which has a melting point of 2800°C. Compared to conventional plastic cables, mineral-insulated fire-resistant cables can carry current one cross-sectional size class higher and are capable of withstanding significantly higher overloads—up to more than 10 times their normal current-carrying capacity.
The copper sheath can be used as a grounding wire.
For mineral-insulated fire-resistant cables, the continuous copper sheath and its extremely low grounding resistance allow them to serve as grounding conductors, eliminating the need for a separate protective earth wire.
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