What are the characteristics of mineral insulated cables?

I. What are the characteristics of mineral insulated cables?1. Fireproof because the cable is all composed of inorganic materials (copper metal and magnesium oxide powder), it will not cause a fire itself, it is not possible to burn or combustion, due to the melting point of copper is 1083 ° C, the mineral insulating layer is also more than 1,000 ° C melting point. Therefore, this kind of cable can continue to maintain power supply in a fire situation close to the melting point of copper, and is a real sense of fireproof cable. And can pass the BS6387 C, W, Z test. 2, large flow-carrying capacity, waterproof due to mineral insulated cables can reach 250 ℃ actual normal operating temperature, IEC60702 mineral insulated cable continuous operating temperature is 105 ℃, which is to take into account the end of the sealing material and the need for safety, even so, it is far more than the flow-carrying capacity of the other cables, because of the mineral insulation has a better thermal conductivity than the plastic Better thermal conductivity, so the same operating temperature, the current-carrying capacity is greater. For more than 16mm2 line, can be reduced by one cross-section, for places where human contact is not allowed, can be reduced by two cross-section. 3., explosion-proof Corrosion-resistant and explosion-proof characteristics: As the mineral insulated cable using metal sheath as a protective layer, flammable gases, oil vapor, flame can not reach the electrical equipment connected to the cable, so the cable has explosion-proof characteristics. Corrosion resistance: due to copper has a better corrosion resistance, in the normal use of the environment does not require any additional protection, in special environmental conditions, such as copper has a strong corrosive effect on the environment, the cable outside and then add a layer of PVC outer sheath, so the cable has a very good corrosion resistance. 4, resistance to mechanical damage, long service life, halogen-free and non-toxic resistance to mechanical damage: due to the cable's metal jacket has a certain degree of strength and toughness, so the cable is subjected to bending, pressure, so the cable has a good resistance to mechanical damage, the cable has a good resistance to mechanical damage. So when the cable is subjected to bending, flattening, twisting and other deformations, the relative position between the core wires as well as between the core wires and the sheath remains unchanged, which will not produce a short circuit and will not affect the electrical performance. Long service life: As the materials used in the cable are all inorganic materials, they do not age. Its service life can be calculated according to the rate of copper sheath oxidation corrosion. Data show that the sheath oxidation of 0.25mm, in the 250 ℃ ambient temperature needs 257 years, while the sheath thickness of mineral insulated cables are generally in the 0.34-1.05 between the use of the temperature is lower than 250 ℃, so the cable has the characteristics of long life. Halogen-free and non-toxic: because the cable is all made of inorganic materials (copper metal and mineral insulation), so even if burned at a high temperature of 1,000 ℃ will not produce smoke, halogens and toxic gases is the true meaning of halogen-free and non-toxic cables. 5, overload-resistant, copper jacket can be used as a grounding line overload-resistant: due to the melting point of copper is 1,083 ℃, the mineral insulating layer is 1,000 ℃ above the melting point, compared with the common plastic Compared with ordinary plastic cables, the capacity of mineral insulated cables can increase the capacity of a cross-section level, and at the same time can withstand considerable overload, its overload capacity can reach more than 10 times the normal load capacity. Copper sheath can be used as grounding wire: For mineral insulated cables, due to the continuity of the copper sheath and the very low grounding resistance, it can be used as a grounding conductor without the need for a separate grounding conductor.

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