1.电缆桥架防火等级选择电缆桥架,有防火要求的部分可以添加在电缆梯架内,托盘用火或板的阻燃性能,材料如网络形成一个封闭或半封闭结构,并采取在汽-水桥和其表面涂刷防火涂料,其耐火材料整体性能应满足相关规范或标准的要求。铝合金电缆桥不适合高防火。在同样的规范下，阻燃电缆桥的造价比钢缆桥高出2.2倍，使用寿命是钢索大桥的5倍以上，重量比钢索大桥重30%。防火电缆桥比钢缆桥略贵，使用寿命是钢索电桥的三倍多。重量基本上与钢索大桥相同。

1. The fire resistance level of cable tray should be selected. The parts with fire resistance requirements can be added to the cable ladder. The tray should have flame retardant properties, and materials such as a network should form a closed or semi closed structure. Fire resistant coatings should be applied to the surface of the steam water bridge. The overall performance of the fire resistant materials should meet the requirements of relevant specifications or standards. Aluminum alloy cable bridges are not suitable for high fire resistance. Under the same specifications, the cost of flame-retardant cable bridges is 2.2 times higher than that of steel cable bridges, with a service life more than 5 times that of steel cable bridges, and a weight 30% heavier than steel cable bridges. Fireproof cable bridges are slightly more expensive than steel cable bridges, and their service life is more than three times that of steel cable bridges. The weight is basically the same as that of a steel cable bridge.

2.电缆桥架的选择填充率电缆梯架、托盘的宽度和高度的选择应符合填充率的要求,电缆梯架、托盘填充率在一般情况下,在电力电缆的40% ~ 50%,和控制电缆的50% ~ 70%,应保留10% ~ 25%备抵项目发展余量

2. The selection of cable tray filling rate The selection of cable ladder and tray width and height should meet the requirements of filling rate. In general, the filling rate of cable ladder and tray should be kept at 40% to 50% of power cables and 50% to 70% of control cables, with a reserve of 10% to 25% as a reserve for project development margin

3.电缆托盘负载级别选择电缆桥架负载级别的选择,电缆槽均匀分布工作负载不应大于所选电缆桥架负载额定载荷均匀分布的水平,如果实际跨度电缆桥架的支吊架不等于2 m,均匀分布载荷的工作应符合要求。各部件和支撑架的规格和尺寸应与托盘、梯子的直部分和曲线相匹配。

3. The selection of cable tray load level should be based on the selection of cable tray load level. The working load of the cable tray should not exceed the level of uniform distribution of the rated load of the selected cable tray. If the actual span of the cable tray support and hanger is not equal to 2 meters, the work of uniformly distributing the load should meet the requirements. The specifications and dimensions of each component and support frame should match the straight and curved parts of the pallet and ladder.

4.电缆桥架的规格尺寸选择工程实际中，在电缆桥架的规格尺寸选择方面的问题是要么偏大，要么偏紧张。《民用建筑电气设计规范》中8、10、7条规定：“电缆总截面积与托盘内横断面积的比值，电力电缆不应大于40%；控制电缆不应大于50%。

4. In practical engineering, the selection of specifications and dimensions for cable trays is either too large or too tight. According to Article 8, 10, and 7 of the Code for Electrical Design of Civil Buildings, the ratio of the total cross-sectional area of cables to the cross-sectional area inside the tray should not exceed 40% for power cables and 50% for control cables.