电缆桥架挠度值如何取定，目前尚无明确的规定，在重负区显然应考虑减小绕度，这意味着钢材的用量会相应增加，因此，计算时只要充分利用钢材的大允许应力，并保证有足够的安全系数，一般大挠度与跨距(支撑点间距)之比取1/250~1/150为宜。

At present, there is no clear regulation on how to determine the deflection value of cable tray. Obviously, it should be considered to reduce the deflection in the heavy load area, which means that the amount of steel will increase accordingly. Therefore, as long as the large allowable stress of steel is fully used and sufficient safety factor is ensured, the ratio of large deflection to span (spacing between support points) should be 1/250~1/150.

集中荷载和均布荷载的弯距按大弯距相等的条件折算：令pι/4=q2ι2/8则q2=2p/ι∵P=90kg∴q2=180/ι式中：P--1人的荷载(kg)ι--1个支撑点间距(若支点间距不等时取大值)(m)q2--1人的等效均布荷载(kg/m)根据上述初步确定的桥架型号、规格及支点间距，查阅桥架生产厂家的样本资料，反复核查间距和桥架型号，直至满足负荷要求为止。

The bending moment of concentrated load and uniformly distributed load is converted according to the condition that the large bending moment is equal: let p ι/ 4=q2 ι 2/8 then q2=2p/ ι ∵P=90kg∴q2=180/ ι Where: P -- load of 1 person (kg) ι-- The spacing of one support point (the greater value if the fulcrum spacing is different) (m) Q2 -- the equivalent uniformly distributed load of one person (kg/m). According to the above preliminarily determined bridge model, specification and fulcrum spacing, consult the sample data of the bridge manufacturer, and repeatedly check the spacing and Bridge model until the load requirements are met.

济南电缆桥架由室外进入建筑物内时，桥架向外的坡度不得小于1/100。电缆桥架与用电设备交越时，其间的净距不小于0.5m。桥架支撑点，如立柱、托臂或非标准支、构架的间距、安装方式、型号规格、标高，可同意在平面上列表说明，也可分段标出用不同的剖面图、单线图或大样图表示。

When Jinan cable tray enters the building from the outside, the outward slope of the tray shall not be less than 1/100. When the cable tray crosses the electric equipment, the clear distance between them shall not be less than 0.5m. The spacing, installation mode, model, specification and elevation of bridge support points, such as columns, corbels or non-standard supports and frames, can be listed on the plan, or marked in sections and represented by different sectional drawings, single line diagrams or detailed drawings.

电缆桥架引下点位置及引下方式，一般而言，大批电缆引下可用垂直弯接板和垂直引上架，少量电缆引下可用导板或引管，注明引下方式即可。特殊部件如垂直弯接板，转弯接板等则需分别统计。

Generally speaking, a large number of cables can be led down with vertical bending plates and vertical lead-in racks, and a small number of cables can be led down with guide plates or lead pipes, indicating the way of leading down. Special components such as vertical bending plate and turning plate shall be counted separately.

此外桥架接线时的安装标准要多了解，比如将电缆桥架水平放置时，应根据负载量选择支撑柱(固定)之间的时间间隔为1.5-3m。固定的垂直数据不应超过2m。托盘与地面的间距通常应不少于2.5m，垂直放置时，其间距应不少于1.8m。应该使用盖子来保护不够高的托盘。

In addition, the installation standards for cable tray wiring should be understood. For example, when the cable tray is placed horizontally, the time interval between support columns (fixed) should be selected as 1.5-3m according to the load. The fixed vertical data shall not exceed 2m. The distance between the tray and the ground shall not be less than 2.5m generally, and when placed vertically, the distance shall not be less than 1.8m. Covers should be used to protect trays that are not high enough.

拆卸和安装多层时，上托盘距离上(天花板)板不小于0.3m。电缆可以在托盘中无间隙地放置，但不允许彼此绞合。托盘中的填充率不应超过横截面的40。不同电源的电源线;请勿将电压等级不同的电源线放在统一的托架中。

When removing and installing multiple layers, the distance between the upper tray and the upper (ceiling) plate shall not be less than 0.3m. Cables can be placed without gaps in the tray, but it is not allowed to twist each other. The filling rate in the tray shall not exceed 40% of the cross section. Power lines of different power supplies; Do not put power cords with different voltage levels in a unified bracket.

敷设在 济南电缆桥架桥梁上的电缆应标明电缆编号，型号规格，长度，起点和终点等。在起点，终点和每50m。桥梁沿线穿过建筑伸缩缝时，一定要分为几段(100毫米)。金属桥架一定要具有良好的接地连接(零连接)。

Cables laid on Jinan cable bridge shall be marked with cable number, model, specification, length, starting point and ending point, etc. At the start, end and every 50m. When the bridge passes through the building expansion joint, it must be divided into several sections (100mm). The metal bridge must have good grounding connection (zero connection).

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