敷设高度：电缆桥架水平敷设时，底边距地面高度一般不宜低于2.2m2.5m；垂直敷设时，距地面1.8m以下的部分应加金属盖板保护（电气专用房间内除外）。

Laying height: When laying cable trays horizontally, the bottom edge should generally not be less than 2.2m to 2.5m above the ground; when laying vertically, the part below 1.8m above the ground should be protected with a metal cover plate (except for electrical rooms).

伸缩节设置：由于热胀冷缩，当钢制电缆桥架直线段长度超过30m，铝合金或玻璃钢制桥架超过15m时，宜设置伸缩节；跨越建筑物变形缝处，必须设置补偿装置。

Expansion joint setting: Due to thermal expansion and contraction, expansion joints should be installed when the straight section length of steel cable trays exceeds 30m or aluminum alloy or fiberglass trays exceed 15m; Compensation devices must be installed at the deformation joints of buildings.

电缆填充率：为了保证散热和维护空间，电缆在桥架内的总截面积不应超过桥架内截面积的40%（控制电缆可放宽50%），且宜预留10%~25%的工程发展余量。

Cable filling rate: In order to ensure heat dissipation and maintenance space, the total cross-sectional area of cables inside the cable tray should not exceed 40% of the cross-sectional area inside the tray (control cables can be relaxed to 50%), and a 10% to 25% engineering development margin should be reserved.

分层与隔离：不同电压、不同用途的电缆（如1kV以上和以下的电缆、电力电缆与电信电缆）不宜敷设在同一层桥架内。如果受条件限制必须同层敷设，中间必须用隔板进行隔离。通常的排列顺序是：弱电控制电缆在上层，往下依次是一般控制电缆、低压动力电缆和高压动力电缆。

Layering and isolation: Cables with different voltages and purposes (such as cables above and below 1kV, power cables, and telecommunications cables) should not be laid in the same layer of cable trays. If it is limited by conditions and must be laid on the same layer, a partition must be used for isolation in the middle. The usual arrangement order is: weak current control cables are on the top layer, followed by general control cables, low-voltage power cables, and high-voltage power cables.

可靠接地：金属电缆桥架及其支架全长应不少于2处与接地保护导体（PE）可靠相连，以确保用电。

Reliable grounding: The entire length of metal cable trays and their supports should be reliably connected to the grounding protection conductor (PE) at no less than 2 points to ensure electrical safety.