What are the advantages of mineral-insulated fire-resistant cables?
Release date:
2022-07-08 11:07
Source:
Due to Mineral-insulated fire-resistant cable All of the materials used are inorganic, offering several advantages that other cables lack. Mineral-insulated cables are composed of copper and mineral insulation materials. These cables are non-combustible, do not support combustion, and can continue operating even under flame conditions. Moreover, mineral-insulated fire-resistant cables come with numerous additional benefits.
1. High operating temperature: Mineral-insulated fire-resistant cables can withstand continuous operating temperatures of up to 250°C. In emergency situations, the cables can continue to operate briefly even at temperatures close to the melting point of the copper sheath (1083°C).
2. Long lifespan. Using inorganic materials ensures the cable's stability, fire resistance, and extended service life.
3. Explosion-proof: Highly compact insulation prevents the passage of steam, gases, and flames through equipment components connected to the cable.
4. Small outer diameter—this cable has a smaller diameter compared to other cables with the same rated current. Additionally, if the mineral-insulated cable is fully submerged in water, its seamless metal sheath allows it to continue functioning without interruption.
5. High mechanical strength. It is durable and can withstand severe mechanical damage without compromising its electrical performance.
6. High current-carrying capacity: Mineral-insulated fire-resistant cables can handle significantly higher currents than other types of cables, given the same cross-sectional area. Additionally, they can withstand substantial overloads without failure.
7. Short-circuit fault levels. At the same temperature, mineral-insulated fire-resistant cables exhibit a significantly higher short-circuit failure rate compared to other types of cables.
8. Grounding. For mineral-insulated fire-resistant cables, a separate grounding conductor is not required, as the copper sheath used in these cables already serves as the grounding conductor and offers excellent low grounding resistance. For grounding-sheathed circuit (ESR) wiring in MEN (Multi-Earthed Neutral) systems, the outer copper sheath can function both as the grounding conductor and the neutral point conductor.
9. High Corrosion Resistance: The copper sheath of mineral-insulated fire-resistant cables exhibits excellent corrosion resistance, eliminating the need for additional protection in most applications. However, when the copper sheath is particularly susceptible to chemical corrosion or faces severe industrial contamination, it is recommended to use mineral-insulated cables equipped with a plastic outer jacket for enhanced protection.
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