电缆桥架安装需要遵循以下规范：

The installation of cable trays needs to follow the following specifications:

接地规范：金属电缆桥架及其支架全长应不少于 2 处与接地（PE）或接零（PEN）干线相连接。非镀锌电缆桥架间连接板的两端跨接线铜芯接地线，接地线小允许截面积不小于 4mm²。镀锌电缆桥架间连接板的两端不跨接接地线，但连接板两端不少于 2 个有防松螺帽或防松垫圈的连接固定螺栓。

Grounding specification: The total length of metal cable trays and their supports should be connected to the grounding (PE) or neutral (PEN) main line at no less than 2 points. The copper core grounding wire for the two ends of the connecting plate between non galvanized cable trays shall have a minimum allowable cross-sectional area of not less than 4mm ². The two ends of the connecting plate between galvanized cable trays shall not be connected to the grounding wire, but there shall be no less than 2 connection fixing bolts with anti loosening nuts or anti loosening washers at both ends of the connecting plate.

防火规范：电缆桥架处如有防火要求的场所，应采取防火隔离措施。在穿过防火墙及防火楼板时，需配合土建施工预留洞口，在洞口处预埋好护边角钢，施工时根据电缆敷设的层数和根数用 L50×50×5 角钢作固定框，同时将固定框焊在护边角钢上；也可先作好框在土建施工中砌体或浇灌混凝土时安装在墙、板中。

Fire prevention regulations: If there are fire prevention requirements at cable trays, fire isolation measures should be taken. When passing through firewalls and fire-resistant floor slabs, it is necessary to cooperate with civil construction to reserve openings. Protective angle steel should be pre embedded at the openings. During construction, L50 × 50 × 5 angle steel should be used as a fixed frame according to the number of layers and cables laid, and the fixed frame should be welded to the protective angle steel; Alternatively, the frame can be installed in the wall or slab during masonry or concrete pouring in civil construction.

电缆填充率规范：电缆在桥架内的填充率，电力电缆不应大于 40%，控制电缆不应大于 50%，并应留有一定的备用空位，以便今后增添电缆。

Specification for cable filling rate: The filling rate of cables in cable trays should not exceed 40% for power cables and 50% for control cables, and a certain amount of spare space should be left for future cable additions.

规格选择规范：所选托盘、桥架规格的承载能力应满足规定，其工作均布荷载不应大于所选托盘、梯架荷载等级的额定均布荷载，工作均布荷载下的相对挠度不宜大于 1/200。

Specification selection criteria: The bearing capacity of the selected tray and bridge specifications should meet the requirements, and their uniformly distributed load should not exceed the rated uniformly distributed load of the selected tray and ladder load level. The relative deflection under uniformly distributed load should not exceed 1/200.

安装间距规范：

Installation spacing specifications:

电缆桥架水平敷设时，支撑跨距一般为 1.5-3m；垂直敷设时固定点间距不宜大于 2m。

When laying cable trays horizontally, the support span is generally 1.5-3m; When laying vertically, the spacing between fixed points should not exceed 2m.

桥架弯通弯曲半径不大于 300mm 时，应在距弯曲段与直线段结合处 300-600mm 的直线段侧设置一个支、吊架；当弯曲半径大于 300mm 时，还应在弯通中部增设一个支、吊架。

When the bending radius of the bridge is not greater than 300mm, a support and hanger should be installed on the side of the straight section 300-600mm away from the junction of the bending section and the straight section; When the bending radius is greater than 300mm, a support or hanger should be added in the middle of the bend.

支、吊架的规格一般不应小于扁钢 30mm×3mm，角钢 25mm×25mm×3mm。固定支点间距一般不应大于 1.5-2m，在进出接线盒、箱、柜、转角、转弯和变形缝两端及丁字接头的三端 500mm 以内应设固定支持点。

The specifications of supports and hangers should generally not be less than 30mm x 3mm for flat steel and 25mm x 25mm x 3mm for angle steel. The distance between fixed support points should generally not exceed 1.5-2m, and fixed support points should be set within 500mm at both ends of the entrance and exit junction box, box, cabinet, corner, turning and deformation joint, and the three ends of the T-shaped joint.

安装位置规范：

Installation location specifications:

电缆桥架宜高出地面 2.2 米以上，桥架顶部距顶棚或其它障碍物不应小于 0.3 米，桥架宽度不宜小于 0.1 米。

The cable tray should be at least 2.2 meters above the ground, and the distance between the top of the tray and the ceiling or other obstacles should not be less than 0.3 meters. The width of the tray should not be less than 0.1 meters.

桥架与用电设备交越时，其间的净距不小于 0.5m。两组电缆桥架在同一高度平行敷设时，其间净距不小于 0.6m。

When the bridge intersects with electrical equipment, the clear distance between them shall not be less than 0.5m. When two sets of cable trays are laid parallel at the same height, the clear distance between them should not be less than 0.6m.

电缆桥架应敷设在易燃易爆气体管道和热力管道的下方。与水管同侧上下敷设时，宜安装在水管的上方；与热水管、蒸气管平行上下敷设时，应敷设在热水管、蒸气管的下方。

Cable trays should be laid below flammable and explosive gas pipelines and thermal pipelines. When laid on the same side as the water pipe, it is advisable to install it above the water pipe; When laying parallel to the hot water pipe and steam pipe, it should be laid below the hot water pipe and steam pipe.

电缆固定规范：电缆桥架内缆线垂直敷设时，在缆线的上端和每间隔 1.5 米处应固定在桥架的支架上；水平敷设时，在缆线的首、尾、转弯及每间隔 3-5 米处进行固定。

Cable fixing specifications: When cables are vertically laid in cable trays, they should be fixed on the brackets of the tray at the upper end of the cable and every 1.5 meters; When laying horizontally, fix the cable at the beginning, end, turn, and every 3-5 meters.

伸缩缝规范：直线段钢制电缆桥架长度超过 30m，铝合金或玻璃钢制电缆桥架长度超过 15m 应设有伸缩节，跨越伸缩缝处设置补偿装置，可用带伸缩节的桥架。

Expansion joint specification: Steel cable trays with a length exceeding 30m in straight sections and aluminum alloy or fiberglass cable trays with a length exceeding 15m should be equipped with expansion joints. Compensation devices should be installed at the expansion joint crossing points, and cable trays with expansion joints can be used.

其它规范：桥架安装应牢固，横平竖直，沿梯架、托盘水平走向的支架左右偏差不应大于 10mm，其高低偏差不应大于 5mm。桥架与支架间螺栓、桥架连接板螺栓紧固无遗漏，螺母位于桥架外侧。当铝合金桥架与钢支架固定时，应有相互间绝缘防电化腐蚀措施，一般可垫石棉垫。

Other specifications: The installation of cable trays should be firm, horizontal and vertical. The deviation of the brackets along the horizontal direction of the ladder and tray should not exceed 10mm, and the height deviation should not exceed 5mm. The bolts between the bridge and the bracket, as well as the bolts of the bridge connecting plate, are tightened without omission, and the nuts are located on the outside of the bridge. When fixing aluminum alloy cable trays and steel brackets, there should be mutual insulation and anti-corrosion measures, and asbestos pads can generally be used.