快盈V500大发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
快盈V500大发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. 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.