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Wire and Cable Selection

2015-09-22

Due to the wide use of automation technology, building high-rise development to accelerate the development and construction of power grids to increase various electrical installations, fire hazards also will be increased, increasing the degree of risk of fire. Fire lines for electricity in the country in the proportion of the total number of fires has been on the rise, how to prevent a fire hazard, this article briefly describes the selection from the wire and cable：

The first start cable material point of view, should be possible to avoid the use of aluminum using copper cable core. When the current through the wire or cable, the presence of impedance will cause power loss, the wire or cable, fever, temperature, the wire or cable insulation accelerated aging, damage or performance degradation caused by insulation breakdown, make joint connection oxidation rate increased, increasing the contact resistance so that further heat oxidation, increasing the contact resistance so that further heat oxidation, causing leakage, breakage, etc., or even cause a fire. Due to low resistivity copper cables with cross-section of the cable is much less heat than aluminum, making the run safer. And copper cable connection is stable head performance was not due to oxidation accident. Therefore, in the power cable, especially when the field of underground power cables, has outstanding advantages. Use copper cables underground power supply has low accident rate, corrosion resistance, high reliability, easy maintenance construction. This is currently the main power supply cable in the underground copper cables reason。

The second fire protection requirements in accordance with the degree of electrical wiring requirements, choose to use halogen-free flame retardant type, fire resistant, mineral insulated wires, cables or branch cables. This will not only better terms from the electrical circuit to prevent fires, but also to better ensure the fire when the fire broke electricity reliability and security. But there is still some fire retardant electrical wiring limits。