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Mineral Insulated Cable, often referred to as MI cable
Mineral Insulated Cable, often referred to as MI cable, is a high-performance electrical cable known for its exceptional durability and reliability in extreme conditions. It is constructed with a copper conductor core, wrapped in a copper sheath, and insulated with magnesium oxide (MgO) powder, making it a completely inorganic cable.
Key features of MI cable include:
- Fire Resistance: MI cables are highly fire-resistant due to their mineral insulation, which allows them to maintain functionality even during a fire. They can operate in temperatures of 950°C for up to 180 minutes.
- High-Temperature Resistance: Capable of withstanding continuous operating temperatures up to 250°C, and short-term exposure to temperatures up to the melting point of copper at 1083°C.
- Moisture Resistance: The solid copper sheath provides protection against moisture ingress, making these cables suitable for wet or corrosive environments.
- Durability: The robust construction of MI cables makes them highly resistant to physical damage.
- Compact Size: MI cables have a smaller diameter than other cables with the same current-carrying capacity due to the absence of organic insulation materials.
- Overvoltage Resistance: MI cables can withstand overvoltage without significant damage, as the magnesium oxide insulation material has a melting point of 2800°C.
- Corrosion Resistance and Mechanical Damage Resistance: The copper sheath and the high-compression magnesium oxide provide excellent protection against corrosion and mechanical stress.
Applications for MI cables are extensive and include:
- Fire Protection Systems: Used in fire alarm and sprinkler systems to ensure operational continuity during fires.
- Industrial Heating: Utilized for heating applications in industrial processes, including heat tracing for pipelines and high-temperature furnaces.
- Power and Control: MI cables are used for power transmission and control in critical environments.
In summary, the Mineral Insulated Cable is a versatile, reliable, and safe choice for a wide range of applications where fire safety, high temperatures, and durability are paramount.
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