What are the advantages of mineral-insulated fire-resistant cables?
Release date:
2022-06-14 17:58
Source:
Due to Mineral-insulated fire-resistant cable All the materials used are inorganic, giving them several advantages that other cables don’t have. Composed of copper and mineral insulation materials, mineral-insulated cables are non-combustible and do not support combustion—they can even continue functioning under conditions close to flames. Moreover, mineral-insulated fire-resistant cables offer many additional benefits as well.
1. The operating temperature is very high. Mineral-insulated fire-resistant cables can withstand continuous operating temperatures of up to 250°C. Moreover, in emergency situations, the cables can continue functioning briefly at temperatures close to the melting point of the copper sheath (which is 1083°C).
2. Long lifespan. By using inorganic materials, the cable's stability, fire resistance, and service life can be reliably ensured.
3. Explosion-proof. Highly compressed insulating material prevents steam, gases, and flames from passing between equipment components connected to the cable.
4. Small outer diameter—smaller in diameter than other cables with the same rated current. If the mineral-insulated cable is fully submerged in water, its seamless metal sheath allows it to continue functioning effectively.
5. High mechanical strength. Durable and long-lasting, it can withstand severe mechanical damage without compromising its electrical performance.
6. High current-carrying capacity. For cables with the same cross-sectional area, mineral-insulated fire-resistant cables can transmit significantly higher currents compared to other types of cables. At the same time, they can withstand substantial overloads without damage.
7. Short-circuit fault ratings: At the same temperature, mineral-insulated fire-resistant cables exhibit significantly higher short-circuit fault rates compared to other types of cables.
8. Grounding. For mineral-insulated fire-resistant cables, an independent grounding conductor is not required, as the copper sheath used in these cables already serves as a grounding conductor, providing excellent low grounding resistance. Regarding the grounding sheath circuit (ESR) wiring, in a MEN (Multi-Earthed Neutral) system, the outer copper sheath can be utilized simultaneously as both the grounding and neutral conductors.
9. High Corrosion Resistance: The copper sheath of mineral-insulated fire-resistant cables exhibits excellent corrosion resistance, eliminating the need for additional protective measures in most applications. However, in environments where the copper sheath may be susceptible to chemical corrosion or severe industrial contamination, it is recommended to use mineral-insulated cables encased in a plastic sheath for enhanced protection.
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