Mineral Insulated Cable

Mineral Insulated Cable:

Mineral insulated cables are used in important electrical engineering fields, such as hazardous areas: airports, oil depots, liquefied gas stations, chemical industry, coal mines, (nuclear) power plants, steel smelting and shipbuilding, etc.; important public facilities: satellite ground stations, railway wiring , alarm, fire protection, etc.; places to ensure personal and property safety: historic buildings, hotels, high-rise buildings, museums, libraries, banks, hospitals, insurance, shopping malls, scientific research institutions, etc. Mineral insulated cables can be used for a long time once laid.

Mineral insulated cable, the copper conductor core wire is wrapped with copper sheath, and magnesium oxide powder is used as inorganic insulating material to isolate the conductor and sheath. The outer layer can choose a suitable protective sheath according to the needs. Commonly known as MICC or MI cable. There is also a A similar kind of cable uses metal instead of copper sheath to wrap the core wire and insulating material, which is called mineral insulated metal sheathed cable.

All materials of mineral insulated cables are inorganic materials, so it has some advantages that other cables cannot have.

1, refractory

The 2 materials used in mineral insulated cables copper and mineral insulation are inorganic substances. So the cable will not burn, nor will it support combustion, and it can continue to operate under conditions close to flames. The copper sheath melts at 1083 degrees Celsius.

2, high operating temperature

Mineral insulated cables can withstand continuous operating temperatures up to 250 degrees Celsius. And, in emergency situations, the cables can continue to operate for short periods of time at temperatures close to the melting point of the copper sheath.

3, long life

Inorganic materials used in mineral insulated cables to ensure cable stability, long life and fire resistance.

4, explosion-proof

A highly compacted insulating material in mineral insulated cables that prevents the passage of vapors, gases and flames between the parts of the equipment connected to the cable.

5, the outer diameter is small

Mineral insulated cables are smaller in diameter than other cables with the same current rating.

6, waterproof

Mineral insulated cables can continue to operate with their seamless metal jacket if they are completely immersed in water.

7, high mechanical strength

Mineral insulated cables are robust and can withstand severe mechanical damage without compromising their electrical properties.

8, the current carrying capacity is large

For cables of the same cross section, mineral insulated cables transmit higher currents than other types of cables. At the same time, mineral insulated cables can also withstand considerable overload.

9, short circuit fault rating

Mineral insulated cables have significantly higher short-circuit fault ratings than other types of cables at the same temperature.

10, ground

For mineral insulated cables, a separate ground conductor is not required because the copper sheath used in this cable already acts as a ground conductor and provides a good low ground resistance. For ground sheath return (ESR) wiring In other words, in a MEN (Multiple Earth Neutral) system, the outer copper sheath can be used as a ground and neutral conductor.

11, high corrosion resistance

The copper sheath of mineral insulated cables has high corrosion resistance, and for most installations, it does not require additional protective measures. Where the copper sheath of the cable is susceptible to chemical corrosion or industrial pollution, it should be Use a plastic outer jacket to protect mineral insulated cables.