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Mineral insulated cable
NegotiableUpdate on 05/06
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Overview
Mineral insulated cable, a type of cable that wraps copper conductor core wire with a copper sheath and uses magnesium oxide powder as an inorganic insulation material to isolate the conductor from the sheath. The outermost layer can be protected with an appropriate protective sheath as needed
Product Details
Mineral insulated cable（Mineral insulated cable）， A cable that wraps a copper conductor core wire with a copper sheath and uses magnesium oxide powder as an inorganic insulation material to isolate the conductor from the sheath. The outermost layer can be protected with an appropriate protective sheath as needed. Commonly known as MICC or MI cable. There is a similar type of cable that uses metal instead of copper sheath to wrap the core wire and insulation material, called Mineral Insulated Metal Sheathed Cable (MIMS Cable).
Classification and differentiation
Except for the national standard cable (rigid), all other flexible mineral cables are enterprise standards.
Relatively speaking, the national standard cable technology is high and the construction is complex and rigorous. Because the metal sheath itself is extremely difficult to bend, the installation difficulty is the highest, and expensive specialized accessories are required. The fire resistance performance is also the highest BS6387; The installation of flexible cables is similar to ordinary cables, with a low construction threshold, but the fire resistance performance also reaches BS6387. In application, matching products are mainly selected based on the building's fire protection level and importance.
Rigid mineral cables cannot be produced for a long time due to process limitations. Special accessories are used for installation, and special tools such as baking guns and bending wheels can achieve a bending radius of 6D during installation. Flexible mineral cables can be continuously produced, and different metal sheath structures have different bending properties. Domestic processes mainly include copper tubes (rigid), aluminum tubes, horizontally welded corrugated copper tubes, and interlocking armored metal sheaths. The allowable bending radius gradually decreases, with a minimum of 7D (D is the outer diameter of the cable, while the bending radius of ordinary cables is about 10D). In terms of design and construction, the actual site and cable tray limitations should be considered, and suitable products should be selected. Generally speaking, the smaller the allowable bending radius, the less difficult the installation.
Rigid mineral cables themselves are relatively hard and also have strong impact resistance. Flexible mineral cables have strong flexibility, and their impact resistance depends on the specific structural composition of the corresponding cable. All mineral cables, except for the interlocking armored type, are difficult to bend and penetrate into pipelines for laying, especially large-sized cables.
advantage
Due to the fact that all materials of this cable are made ofinorganic materialsSo it has some advantages that other cables cannot have.
1. Fire resistant
inMineral insulated cableThe two materials used in China, copper and mineral insulation, are inorganic substances. This type of cable will not burn or support combustion, and can continue to operate under conditions close to flames. The copper sheath melts at 1083 ℃.
2. High operating temperature
Mineral insulated cableCan withstand continuous operating temperatures up to 250 ℃. Moreover, in emergency situations, the cable can continue to operate for a short period of time at temperatures close to the melting point of the copper sheath.
3. Long lifespan
inMineral insulated cableApplied in ChinainorganicThe material ensures that the cable has stability, long service life, andfire-resistantSex.
4. Explosion proof
Mineral insulated cableHighly compacted insulation material can prevent steam, gas, and flames from passing between equipment parts connected to cables.
5. Small outer diameter
Mineral insulated cableThe diameter of the cable is smaller than other cables with the same rated current.
6. Waterproof
IfMineral insulated cableImmersed in water, with the help of its seamless metal sheath,Mineral insulated cableThe operation can continue.
7. High mechanical strength
Mineral insulated cableDurable and sturdy, capable of withstanding severe mechanical damage without compromising its electrical performance.
8. Large current carrying capacity
For cables of the same cross-section,Mineral insulated cableTransmitting higher currents than other types of cables. Meanwhile,Mineral insulated cableIt can also withstand considerable overload.
9. Short circuit fault rated value
At the same temperature,Mineral insulated cableThe short-circuit fault rating of the cable is significantly higher than that of other types of cables.
10. Grounding
ForMineral insulated cableSpeaking of which, an independent grounding wire is not necessary because the copper sheath used in this cable already serves as a grounding wire, providing good low grounding resistance. Grounding protective skin circuit (ESR)wiringIn MEN (multi grounded neutral) systems, the outer copper sheath can be used as a grounding and neutral conductor.
11. High corrosion resistance
Mineral insulated cableThe copper sheath has high corrosion resistance and does not require additional protective measures for most devices. In areas where the copper sheath of cables is susceptible to chemical corrosion or severe industrial contamination, a plastic outer sheath should be used for protectionMineral insulated cable.
