If the temperature of the dense busway is too high, a fault will occur. For the sake of insurance, it is necessary to know the heat dissipation method of the densely packed busway to prevent the impact of excessive temperature on the busway.
Low-voltage transmission line conductors, wires, cables, branch dense bus ducts, exposed conductive poles, punctured cables, etc. Due to the different heat dissipation performance of different products, the current carrying capacity per square millimeter is also different. The same product, the same specification of the wire, through the same current, when the temperature rises, the heat dissipation performance will also change; Due to the different design of the cross-sectional area, the temperature rise is also different. Of course, as the temperature increases, the resistance increases, the pressure increases, and the energy loss increases.
The same is true for densely packed busways. Therefore, it is wrong to measure the flowmeter per square millimeter of the conductor in the bus duct conductor with dense conductivity. The structural design and heat dissipation, but the current carrying capacity is closely related to different impedances, inductances and other elements. Therefore, according to the national standard GB7251-2006, the rated current restricts the temperature rise to confirm the current carrying capacity and strengthen the bus duct.
Therefore, the laying of the densely distributed busway must be measured on the spot, the length accuracy of the installation groove is required to be high, and the height of the plug-in switch box of the densely distributed busway must also be confirmed according to the design. When the distribution line is laid in the dark, it should be laid in a non-combustible structure, and the thickness of the maintenance layer should not be less than 30mm. When the open laying is adopted, the metal pipe or metal trough should be brushed with fireproof coating for maintenance, because the metal pipe and metal trough themselves do not have fire resistance. When using wires that are insulated and sheathed from non-flame retardant materials, metal pipes and metal trunking should not be used in the shaft for maintenance. However, when the conductor passes through the shaft floor, it is necessary to pass through the plate pipe and groove for maintenance, and the gap between the pipe and the upper and lower end notches must also be sealed.
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Follow the lines ...
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