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(2) Corrosion resistance. The copper sheath has better corrosion resistance and generally does not require additional protective measures. If a serious chemical corrosion site is selected, a plastic sheath can be used to protect the copper sheath.
(3) Waterproof. The copper sheath is made of seamless copper sheathing and can be operated for a long time even if it is immersed in water.
(4) Large current carrying capacity. Compared with other types of cables with the same core cross-section, magnesium oxide fire-proof cables are continuously operated for a long period of time, allowing large ampacity and strong overload capacity.
(5) High mechanical strength. Because the outer sheath is copper sheathed, it is durable and will not damage its structure even if it is affected by general mechanical impact and external forces.
(6) Long service life. The materials that make up the fire-proof cable, whether it is copper core, copper sheath or magnesium oxide powder, are all inorganic materials with good chemical stability, so there is no problem of insulation aging, and it can be used for almost permanent protection.
(7) Safe and reliable. The copper jacket of the fireproof cable itself is a good grounding conductor and can guarantee the safety of personnel.
(8) High temperature resistance. The insulating material of the fireproof cable, magnesium oxide powder, under the protection of the copper sheath, can ensure the normal energization of the cable in a flame at 1000°C for a short time and remain intact.
(9) Smokeless and non-toxic. Magnesium oxide insulated fire-resistant cables do not emit smoke in flames and do not produce any harmful gases.
(10) Explosion protection. Magnesium oxide insulation is tightly pressed between the copper core and the copper sheath to prevent flammable gases and flammable liquid vapors and flames from entering the cable.
Fire protection cable voltage carrying capacity
Fireproof cable voltage current carrying capacity (1) good fire performance. Copper used as a sheath and core has a melting point of 1083°C, and the magnesium oxide powder as an insulating material does not melt at a high temperature of 2200°C. Therefore, the entire cable does not burn and does not burn. Shenyang Fire Science Research Institute's fire performance test shows that the power-operated fire-resistant cable is burned for nearly 2 hours in a 800-1000°C flame, and can also be normally powered. In the last 30 minutes, the flame is raised to 1000-1040°C, but it is still intact. This outstanding feature is based on the incomparable use of organic polymer as insulating layer or sheath layer. Because the organic insulating and sheathing layer of the cable will spontaneously ignite at a temperature of 380 to 430°C, and a large amount of heat will be emitted during the combustion, which will increase the temperature and contribute to the expansion of the fire. The insulating material is almost completely lost. The mechanical strength and insulation properties cannot protect the core from continuing to operate.
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