Power cable products are widely used and of various types. They can be divided into 5 categories, and I will give you some general knowledge.
Flame-retardant cable: refers to a cable that can extinguish itself within a limited time when residual flames or residual burning; according to the flame-retardant material of the cable, it can be divided into halogen-containing flame-retardant cable and halogen-free low-smoke flame-retardant cable. Halogen-free low-smoke cable produces less smoke and does not emit toxic smoke when burning. It is less corrosive when burning, so it has little harm to the environment.
Fire-resistant cable: a cable that can maintain safe operation for a certain period of time under flame burning; widely used in high-rise buildings, subways, underground shopping malls, large power stations and important industrial and mining enterprises and other places related to fire safety and firefighting and lifesaving; mainly used as a power supply circuit for emergency power supply, requiring normal operation during fire, but cannot be used as a high-temperature resistant cable.
Magnesium oxide cable: made of copper core, copper sheath and magnesium oxide insulation material. Its material is inorganic, the melting points of copper and magnesium oxide are 1038℃ and 2800℃ respectively, and its fireproof performance is excellent; it is resistant to high temperature (the cable allows long-term working temperature of 250℃), explosion-proof, large current carrying capacity, good waterproof performance, high mechanical strength, long life, and good grounding performance, but it is expensive, complex process, and difficult to construct. Due to the particularity of the raw materials and processes of magnesium oxide cables, multi-core cables with a cross-section of more than 25mm2 are all composed of single-core cables.
Branch cable: Branch cable can be widely used in various medium and high-rise buildings such as residential buildings, office buildings, business buildings, teaching buildings, and scientific research buildings, as main and trunk cables for power distribution. The application of branch cables should determine the location of each distribution cabinet according to the building electrical design drawing, provide the model, specification and total length of the main cable; the model, specification and length of each branch cable; the location of each branch joint on the main cable; the installation methods include vertical wall laying, horizontal overhead laying, etc.; the required branch cable hanging head, beam hanging and other accessories model, specification and quantity.
Aluminum alloy cable: Its structure mainly includes two categories: non-armored and armored, with or without sheath, and its core wire is made of creep-resistant and high-conductivity aluminum alloy material. Under the premise of meeting the same conductivity, the weight of the alloy cable is half of that of the copper cable with the same current carrying capacity.
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