The main characteristics of mineral-insulated fire-resistant cables
Release date:
2022-06-20 10:46
Source:
Mineral-insulated fire-resistant cable Its structure features a flexible design, with mineral compounds serving as the primary material, effectively addressing the drawbacks of rigid structures—such as flammability and toxicity. Additionally, it boasts several advantages that other cables lack, including fire resistance, high current-carrying capacity, ability to withstand impulse voltages, resistance to mechanical damage, halogen-free and non-toxic properties, explosion-proof capabilities, waterproof performance, corrosion resistance, extended service life, enhanced safety, tolerance to overload conditions, superior heat resistance, and cost-effectiveness.
(1) Fire Resistance
Because mineral-insulated fire-resistant cables are entirely made of inorganic materials, they do not ignite fires—they are non-combustible and do not support combustion—and they produce no toxic gases. Even if exposed to external flames, these cables can continue functioning normally. After the fire has been extinguished, there’s no need to replace the cables. This makes them a truly reliable fire-resistant solution, providing foolproof protection for critical fire-fighting circuits, and they have successfully passed the IEC331 test.
(2) High current-carrying capacity
Mineral-insulated fire-resistant cables can operate normally at temperatures up to 250°C. Because mineral composite materials have superior electrical conductivity compared to plastics, they allow for a larger current-carrying capacity at the same operating temperature. For conduits exceeding 16 mm in diameter, the cross-sectional area can be reduced. Additionally, in areas where human contact is prohibited, the cross-sectional current rating can be further minimized.
(3) Waterproof, explosion-proof, and corrosion-resistant.
The cable sheath, made from low-smoke, halogen-free, high-flame-retardant materials, boasts exceptional corrosion resistance—plastic sheathing is only required in rare cases of chemical corrosion. Meanwhile, the conductor and insulation are tightly compressed. As a result, not only does this design effectively prevent the intrusion of water, moisture, oil, and certain chemicals, but it also makes the cables suitable for use in hazardous, explosion-prone areas and for connecting various explosion-proof devices.
(4) Excellent bending performance.
Mineral-insulated fire-resistant cables undergo full annealing treatment, giving them a flexibility that surpasses even ordinary plastic cables. Their bending radius is only 3 to 6 times the cable's outer diameter, allowing for repeated bending without damage.
(5) Good grounding
For mineral-insulated fire-resistant cables, the continuity of the sheath and its extremely low grounding resistance can serve as a grounding conductor even in the absence of a separate grounding conductor.
(6) Performance Comparison
Generally, all wires and cables are insulated with organic polymer materials, making them prone to carbonization under flame conditions and thus losing their insulating properties. However, since the primary materials used in mineral-insulated fire-resistant cables are inorganic minerals or mineral compounds—substances that do not ignite—they neither cause fires nor can they burn or support combustion. Moreover, these materials typically have melting points exceeding 1500°C, ensuring that mineral-insulated fire-resistant cables can maintain normal power transmission even when exposed to flames. As a result, they truly qualify as fire-resistant cables.
The process structure of mineral-insulated fire-resistant cables is entirely identical to that of conventional cables, successfully addressing many of the inherent drawbacks in products dictated by the manufacturing process of magnesium oxide-copper-tube mineral-insulated cables. Their introduction marks a milestone in the history of fire-resistant cable development, while also accelerating the pace at which China’s cable technology R&D capabilities align with international standards.
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