Mineral fire-resistant cables are a type of cable suitable for circuits with rated voltages of 1000V and below. These mineral cables can withstand continuous operating temperatures up to 250°C, and under conditions ranging from 950°C to 1000°C, they can maintain power supply for up to 3 hours. Moreover, in short-term or exceptional situations, they can even operate close to copper’s melting point—up to 1083°C.

Main Performance

Fire resistance performance
Since mineral cables are entirely composed of inorganic materials, they inherently do not ignite fires—they neither burn nor support combustion, and they produce no toxic gases. Even when exposed to open flames, these cables continue to function reliably. And after the fire is extinguished, there’s no need to replace the cables—making them truly fire-resistant cables that provide an exceptionally dependable safeguard for emergency power supply lines. They have also successfully passed the IEC331 test conducted by the International Electrotechnical Commission.
(2) High Current Carrying Capacity
Due to the fact that mineral-insulated cables can operate continuously at temperatures up to 250°C, the IEC60702 standard specifies their continuous operating temperature as 105°C—a limitation taken into account for terminal sealing materials and safety requirements. Even so, their current-carrying capacity remains significantly higher than other types of cables. This is because magnesium oxide powder has a better thermal conductivity compared to plastics. As a result, under the same operating temperature conditions, these cables can handle much greater currents. For circuits with conductor cross-sectional areas exceeding 16 mm², the cable size can be reduced by one grade; and in areas where direct human contact is prohibited, the reduction can even extend to two grades.
(3) Waterproof, explosion-proof, and corrosion-resistant
Due to the cable's jacket being made from low-smoke, halogen-free, and highly flame-retardant materials, it exhibits excellent corrosion resistance (requiring a plastic outer jacket only in specific chemically corrosive environments). Moreover, the conductor, insulation layer, and jacket are tightly compressed into a single, integrated unit. This not only effectively prevents the ingress of water, moisture, oils, and certain chemicals but also makes it particularly suitable for use in areas with explosion hazards—as well as for connecting various explosion-proof devices and instruments.
(4) Overload Protection
When a circuit is overloaded, plastic cables may experience insulation heating or even breakdown due to overcurrent or overvoltage. However, mineral-insulated cables behave differently—so long as the heat generated doesn't reach copper's melting point, the cable remains undamaged. Even if transient breakdown occurs, since magnesium oxide at the breakdown point doesn't form carbides under high temperatures, the cable's performance isn't affected. Once the overload condition is resolved, the cable will retain its original performance and can continue functioning normally as before.
(5) High Operating Temperature
Since the melting point of magnesium oxide in the insulation layer is significantly higher than that of copper, this cable can withstand maximum normal operating temperatures of up to 250°C. Moreover, for short periods, it can even operate continuously in environments approaching copper's melting point—up to an impressive 1083°C.
(6) High-performance shielding capability
The copper jacket of the cable is the ideal shielding layer—it not only prevents the cable itself from interfering with other cables, but also effectively blocks external magnetic fields from affecting it.
(7) Long service life
Since the cable is made from inorganic materials, it does not age and can last for at least over a century. Moreover, when equipment is relocated or lines are upgraded, this type of cable can also be disassembled, reassembled, and reused repeatedly.
(8) Small outer diameter, lightweight
Compared to conventional plastic cables of the same type, mineral-insulated cables feature a 50% reduction in outer diameter and a 30% decrease in weight. This not only minimizes the space they occupy but also makes installation significantly easier.
(9) High Radiation Resistance
Since the cable is made entirely of inorganic materials, it boasts a highly efficient neutron capture cross-section and maintains an exceptionally high insulation resistance. As a result, even after exposure to nuclear radiation, the cable’s electrical and mechanical properties remain completely unchanged.
(10) Safety and Environmental Protection
Since the cable is made entirely of inorganic materials and contains no organic substances whatsoever, it will not produce even a trace of smoke—even if exposed to temperatures exceeding 1000°C or subjected to flames intense enough to damage copper. Moreover, it emits no impurities or toxic gases at all. This cable is a truly safe product that embodies green and environmentally friendly principles, effectively preventing the occurrence of "secondary disasters."
(11) Resistance to Mechanical Damage
Due to the cable's metallic sheath, which possesses both strength and flexibility, and because magnesium oxide is highly compressed during the cable manufacturing process, the relative position between the core wires and the sheath remains unchanged even when the cable undergoes deformation such as bending, flattening, or twisting. This ensures that no short circuits occur and that the cable's electrical performance is not affected. Remarkably, even if the cable's outer diameter is compressed down to two-thirds of its original size, it can still function normally.
(12) Excellent Bending Performance
Because this cable has undergone thorough annealing treatment, its flexibility is unmatched by ordinary plastic cables. It has a minimum bending radius of only 3 to 6 times its outer diameter—and can be repeatedly bent multiple times without damage.
(13) Good Grounding
For mineral-insulated cables, due to the continuity of their sheath and extremely low grounding resistance, they can be directly used as grounding wires without the need for a separate, independent grounding conductor.

Fire-resistant capability

(1) This cable boasts exceptional fire resistance.
Whether it's a factory or a building, the safety of electrical wiring is absolutely critical. According to statistics from relevant national authorities, over 50% of fires are caused by electrical wiring issues. Cables are not only the primary components of these systems but also the most vulnerable and challenging part to protect effectively. Therefore, cables must not only withstand external flame damage but also ensure they themselves do not become a source of ignition. Because mineral-insulated cables are made entirely of uniform, inorganic materials, their magnesium oxide insulation remains stable even under conditions of cable overload or short circuits—preventing any open flames from occurring. As a result, wiring systems constructed with mineral-insulated cables are completely fireproof. Moreover, even if a fire breaks out due to other causes, these cables must endure extreme heat while simultaneously enduring relentless impacts from falling debris at the fire scene. Under such harsh conditions, the ability of the cables to reliably activate firefighting equipment, effectively suppress the blaze, and facilitate safe evacuation of occupants—without emitting smoke or toxic gases—becomes the ultimate benchmark for assessing the cable system's fire-resistant performance.
(2) Fire Resistance
The test procedures outlined in BS6387 (the British Standard) precisely replicate the real-world fire resistance performance that cables experience during catastrophic fires. During a fire, cables are constantly subjected to external disturbances—such as firefighting water, burning debris, and even heavy objects—making it impossible for them to maintain structural integrity under such harsh conditions. We know that the fire-resistant properties of organic (plastic) cables rely on mica tape positioned between the conductor and insulation layers. However, once these plastic fire-resistant cables are exposed to flames, the mica layer forms a rigid outer shell, while the insulation material chars into a carbonized protective coating. Unfortunately, the carbonized shell becomes conductive upon contact with water, posing a significant electrical hazard. Meanwhile, the mica-based hard shell tends to flake off when exposed to water or impacted by additional heavy objects. Extensive testing conducted by multiple international organizations has conclusively shown that only mineral-insulated cables fully meet the stringent requirements of the BS6387 standard. In contrast, other fire-resistant cables employing mica insulation (such as NH-type cables) simply cannot guarantee absolute safety in the event of a fire.