济南电缆桥架安装施工要求及规范
电缆桥架在我国的应用只有十多年,在欧美发达也不过是几十年。在一个机房项目中，比起造价昂贵、高科技的硬件和软件，桥架显的很不起眼，也很少为人关注，但它却也是整个布线工程中不可缺少的部分。那么在施工中电缆桥架安装施工要求及规范怎么样？
The application of cable trays in China has only been more than ten years, and in developed countries in Europe and America, it is only a few decades. In a computer room project, compared to expensive and high-tech hardware and software, cable trays may appear inconspicuous and receive little attention, but they are still an indispensable part of the entire cabling project. So what are the requirements and standards for the installation of cable trays during construction?
1 一般规定 1.1本章适用于电压为10KV及以下新建扩建的一般工业与民用建筑电缆、桥架安装和桥架内电缆敷设
1 General Provisions 1.1 This chapter applies to the installation of cables, cable trays, and cable laying inside cable trays for newly constructed and expanded general industrial and civil buildings with a voltage of 10KV or below
1.2电缆桥架安装和桥架内电缆敷设，应按已批准的设计文件施工。
1.2 The installation of cable trays and the laying of cables inside the trays shall be carried out in accordance with the approved design documents.
1.3由支、吊、托架支撑的托盘（槽）或梯架直线段、弯通非直线段组合而成，敷设电缆具有连续性的刚性结构系统，为电缆桥架。见图1.3
1.3 A rigid structural system consisting of trays (troughs) or ladder straight sections and curved non straight sections supported by supports, hangers, and brackets, with continuous cable laying, is called a cable tray. Refer to Figure 1.3
1.4 金属电缆桥架及其支架和引入或引出的金属电缆导管必须接地（PE）或接零（PEN）可靠，且必须符合下列规定:
1.4 Metal cable trays and their supports, as well as metal cable conduits introduced or led out, must be reliably grounded (PE) or grounded (PEN), and must comply with the following regulations:
1.4.1金属电缆桥架及支架全长应不少于2处与接地（PE）或接零（PEN）干线相连接；
1.4.1 The total length of metal cable trays and supports should be connected to the grounding (PE) or neutral (PEN) main line at no less than 2 points;
1.4.2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；
1.4.2 Copper core grounding wire for the two ends of the connecting plate between non galvanized cable trays, with a minimum allowable cross-sectional area of not less than 4mm2 for the grounding wire;
1.4.３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。
1.4.3 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.
1.4.5电缆敷设严禁有绞拧、铠装压扁、护层断裂和表面严重划伤等缺陷。
1.4.5 Cable laying must strictly prohibit defects such as twisting, flattening of armor, breakage of protective layer, and severe surface scratches.
1.4.6电缆桥架处如有防火要求的场所，应采取防火隔离措施。
If there are fire prevention requirements at the cable tray location, fire isolation measures should be taken.
2 施工准备
2. Construction preparation
2.1 技术准备:
2.1 Technical Preparation:
2.1.1按照已批准的施工组织设计（施工方案）进行技术、交底。
2.1.1 Conduct technical and safety briefings in accordance with the approved construction organization design (construction plan).
2.1.2 施工执行工艺标准、图集、规范齐全。
2.1.2 The construction execution process standards, drawings, and specifications are complete.
2.1.3电缆桥架敷设前，应检查桥架敷设有无与其他设备、管线交叉或重叠无法施工的地方，施工前应与各工种、监理或建设单位及设计单位协商好，并作好记录，以保证施工顺利进行。
Before laying cable trays, it is necessary to check whether there are any areas where the tray crosses or overlaps with other equipment or pipelines that cannot be constructed. Prior to construction, it is necessary to consult with various trades, supervisors, construction units, and design units, and make records to ensure smooth construction.
2.1.4根据施工图或施工所用电缆应作好电缆牵引力的计算。
2.1.4 According to the construction drawings or the cables used for construction, the calculation of cable traction force should be carried out.
1.电缆桥架规格及型号必须符合设计要求，附件齐全；桥架与配件、附件和紧固件各种型钢均应采用镀锌标准件。
1. The specifications and models of cable trays must meet the design requirements, and all accessories must be complete; All types of steel for cable trays, accessories, attachments, and fasteners should use galvanized standard parts.
2.各种规格电缆桥架的直线段、弯通、桥架附件及支、吊架立柱及型钢等有产品合格证，桥架内外应光滑平整，无棱刺，不应有扭曲翘边等变形现象。
2. The straight sections, bends, accessories, supports, hangers, columns, and steel sections of various specifications of cable trays should have product certification. The inside and outside of the tray should be smooth and flat, without edges or burrs, and there should be no distortion or warping.
3.桥架订货或制作应按设计要求进行，不应有误，应反复校核以免造成浪费。
3. The ordering or production of cable trays should be carried out according to the design requirements, without errors, and should be repeatedly checked to avoid waste.
4.桥架安装选择需屏蔽电气干扰的电缆回路，有腐蚀的场所、易燃粉尘场所，应选用无盖无孔封闭型托盘，当需要因地制宜的场所，宜选用组装式托盘或有孔托盘及梯架；在容易积灰和其它需遮盖的环境或户外场所，宜带有盖板。低压电力电缆与控制电缆共用同一托盘或梯架时，应选用中间有隔板的托盘或梯架；在托盘、梯架分支、引上、引下处应设适当的弯通；因受空间条件限制不便装设弯通或有特殊要求时，可选用软连接板，铰接板；伸缩缝应设置伸缩板；连接两段不同宽度或高度的托盘、梯架可配置变宽或变高板。但在施工中，支、吊架和桥架的选择应依设计或工程布置条件选择。
4. When installing cable trays, cable circuits that need to be shielded from electrical interference should be selected. In places with corrosion and flammable dust, uncovered and non perforated enclosed trays should be used. When suitable for local conditions, assembled trays or perforated trays and ladders should be selected; In environments or outdoor places that are prone to dust accumulation and require cover, it is advisable to have a cover plate. When low-voltage power cables and control cables share the same tray or ladder, a tray or ladder with a partition in the middle should be selected; Appropriate bends should be installed at the branching, leading up, and leading down points of pallets and ladders; When it is not convenient to install bends due to space constraints or there are special requirements, soft connecting plates and hinged plates can be used; Expansion joints should be equipped with expansion plates; Connecting two trays or ladders of different widths or heights can be configured with variable width or height boards. However, during construction, the selection of supports, hangers, and cable trays should be based on the design or engineering layout conditions.
5.托盘、梯架的宽和高度，应按下列要求选择:
5. The width and height of pallets and ladders should be selected according to the following requirements:
(1)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，以便今后为增添电缆用；
(1) The filling rate of cables in cable trays should not exceed 40% for power cables; The control cable should not exceed 50%. And there should be some spare space left for future cable additions;
(2)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；
(2) The bearing capacity of the selected tray and bridge specifications should meet the requirements. The uniformly distributed load of its work should not exceed the rated uniformly distributed load of the selected pallet and ladder load level;
(3)工作均布荷载下的相对挠度不宜大于1/200。
(3) The relative deflection under uniformly distributed load should not exceed 1/200.
托盘、梯架直线段，可按单件标准长度选择。单件标准长度一般规定为2、3、4、6m。托盘、梯架的宽度与高度常用规格尺寸系列如表2.4-1
Tray and ladder straight sections can be selected according to the standard length of a single piece. The standard length of a single piece is generally specified as 2, 3, 4, and 6 meters. The commonly used specifications and dimension series for the width and height of pallets and ladders are shown in Table 2.4-1
注:符号△表示常用规格。
Note: The symbol △ represents commonly used specifications.
各类弯通及附件规格，应适合工程布置条件，并与托盘、梯架配套。
All types of bends and accessory specifications should be suitable for the engineering layout conditions and matched with pallets and ladders.
支、吊架规格选择，应按托盘、梯架规格层数、跨距等条件配置，并应满足荷载的要求。
The selection of support and hanger specifications should be based on the number of layers, span, and other conditions of the pallet and ladder, and should meet the requirements of the load.
钢制桥架的表面处理方式，应按工程环境条件、重要性、耐久性和技术经济性等因素进行选择。一般情况宜按表2.4-2选择适用工程环境条件的防腐处理方式。当采用表中“T”类防腐方式为镀锌镍合金、高纯化等其它防腐处理的桥架，应按规定试验验证，并应具有明确的技术质量指标及检测方式。
The surface treatment method for steel cable trays should be selected based on factors such as engineering environmental conditions, importance, durability, and technical economy. Generally, it is advisable to choose the anti-corrosion treatment method that is suitable for the engineering environmental conditions according to Table 2.4-2. When using the "T" anti-corrosion method in the table, such as galvanized nickel alloy, high-purity or other anti-corrosion treatments, the bridge should be tested and verified according to regulations, and should have clear technical quality indicators and testing methods.
注:符号“○”表示防腐类别。
Note: The symbol "○" indicates the recommended anti-corrosion category.
6.桥架的外观检查
6. Appearance inspection of bridge frame
桥架产品包装箱内应有装箱清单、产品合格证及出厂检验报告。托盘、梯架板材厚度应满足表2.6的规定。表面防腐层材料应符合现行有关标准的规定。
The packaging box for bridge products should include a packing list, product certification, and factory inspection report. The thickness of pallets and ladder boards should meet the requirements of Table 2.6. The surface anti-corrosion coating material should comply with the relevant national standards currently in effect.
热浸镀锌的托盘、桥架镀层表面应均匀，无毛刺、过烧、挂灰、伤痕、局部未镀锌（直径2mm以上）等缺陷，不得有影响安装的锌瘤。螺纹的镀层应光滑，螺栓连接件应能拧入。
The surface of hot-dip galvanized trays and cable trays should be uniform, without defects such as burrs, overburning, hanging dust, scars, and partial non galvanizing (diameter of 2mm or more), and there should be no zinc nodules that affect installation. The coating of the thread should be smooth, and the bolt connection should be able to be screwed in.
电镀锌的锌层表面应光滑均匀，致密。不得有起皮、气泡、花斑、局部未镀、划伤等缺陷。
The surface of the zinc layer of electroplated zinc should be smooth, uniform, and dense. There shall be no defects such as peeling, bubbles, flower spots, partial uncoated areas, scratches, etc.
喷涂应平整、光滑、均匀、不起皮、无气泡水泡。
The spraying should be smooth, even, without peeling or bubbles.
桥架焊缝表面均匀，不得有漏焊、裂纹、夹渣、烧穿、弧坑等缺陷。
The surface of the bridge welding seam should be uniform and free of defects such as missed welding, cracks, slag inclusion, burn through, arc craters, etc.
桥架螺栓孔径，在螺杆直径不大于M16时，可比螺杆直径大2mm。
The hole diameter of the bridge bolt can be 2mm larger than the screw diameter when the screw diameter is not greater than M16.
螺栓连接孔的孔距允许偏差:同一组内相邻两孔间距±0.7mm,同一组内任意两孔间距±1mm;相邻两组的端孔间距±1.2mm。
The allowable deviation for the distance between bolt connection holes is: the distance between adjacent holes in the same group is ± 0.7mm, the distance between any two holes in the same group is ± 1mm, and the distance between end holes in adjacent groups is ± 1.2mm.
7.膨胀螺栓:应根据允许拉力和剪力进行选择；可按计划验收，丝扣应完好无损。
7. Expansion bolts: should be selected based on allowable tensile and shear forces; The inspection can be carried out according to the plan, and the thread should be intact and undamaged.
8.电缆应有合格证和“CCC”认证标志，并应有“CCC”认证复印件；每盘电缆上应标明规格、型号、电压等级、长度及出厂日期电缆相应完好无损。
8. The cable should have a certificate of conformity and the "CCC" certification mark, and should have a copy of the "CCC" certification; Each cable reel should indicate the specifications, model, voltage level, length, and date of manufacture, and the cable should be intact and undamaged accordingly.
9.电缆外观完好无损，铠装无锈蚀、无机械操作，无皱折和扭曲现象。油浸电缆应密封良好，无漏油及渗油现象。橡套及塑料电缆外皮及绝缘层无老化及裂纹。电缆端头密封良好。
9. The appearance of the cable is intact and undamaged, the armor is not corroded, there is no mechanical operation, and there is no wrinkling or twisting phenomenon. Oil immersed cables should be well sealed without oil leakage or seepage. The rubber sleeve and plastic cable sheath and insulation layer have no aging or cracks. The cable end is well sealed.
10.其它附属材料；电缆标示牌、油漆、汽油、封铅、硬脂酸白布带、橡皮包布、黑包布、塑料绝缘带等均应符合要求
10. Other ancillary materials; Cable signs, paint, gasoline, lead sealing, stearic acid white cloth tape, rubber wrap, black wrap, plastic insulation tape, etc. should all meet the requirements
3 施工工艺
3 Construction Techniques
3.1 电缆桥架安装施工工艺
3.1 Construction process for cable tray installation
3.1.1电缆桥架安装工艺流程:
3.1.1 Cable tray installation process:
定位放线→预埋铁件或膨胀螺栓→支、吊、托架安装→桥架安装→保护接地安装
Positioning and laying out → Pre embedded iron parts or expansion bolts → Installation of supports, hangers, and brackets → Installation of cable trays → Installation of protective grounding
3.1.2根据施工图确定始端到终端位置，沿图纸标定走向，找好水平、垂直、弯通，用粉线袋或画线沿桥架走向在墙壁、顶棚、地面、梁、板、柱等处弹线或画线，并均匀档距画出支、吊、托架位置。
3.1.2 Determine the starting and ending positions according to the construction drawing, mark the direction along the drawing, find the horizontal, vertical, and curved lines, use a powder line bag or draw lines along the bridge direction to snap or draw lines on walls, ceilings, floors, beams, slabs, columns, etc., and draw the positions of supports, hangers, and brackets evenly spaced.
3.1.3预埋铁件或膨胀螺栓
3.1.3 Pre embedded iron parts or expansion bolts
(1) 预埋铁件的自制加工不应小于120mm×80mm×6mm，做法如本标准6.3.7.2图6.3.7.2。其锚固圆钢的直径不小于10mm。
(1) The self-made processing of embedded iron parts should not be less than 120mm × 80mm × 6mm, as shown in Figure 6.3.7.2 of this standard. The diameter of the anchored round steel shall not be less than 10mm.
(2) 紧密配合土建结构的施工，将预埋铁件平面紧贴模板，将锚固圆钢用绑扎或焊接的方法固定在结构内的钢筋上；待混凝土模板拆除后，预埋铁件平面外露，将支架、吊架或托架焊接在上面进行固定。
(2) Closely cooperate with the construction of civil engineering structures, tightly adhere the embedded iron parts to the formwork, and fix the anchoring round steel to the steel bars inside the structure by binding or welding; After the concrete formwork is removed, the embedded iron parts should be exposed on the surface, and the brackets, hangers or brackets should be welded on top for fixation.
(3) 根据支架承受的荷重，选择相应的膨胀螺栓及钻头；埋好螺栓后，可用螺母配上相应的垫圈将支架或吊架直接固定在金属膨胀螺栓上，可参见本标准6.3.7.7图表。
(3) Select the corresponding expansion bolts and drill bits based on the load borne by the bracket; After burying the bolts, the bracket or hanger can be directly fixed to the metal expansion bolt with nuts and corresponding washers, as shown in Figure 6.3.7.7 of this standard.
4.支、吊架安装
4. Installation of supports and hangers
(1) 支架与吊架所用钢材应平直，无显著扭曲。下料后长短偏差应在3mm范围内，切口处应无卷边、毛刺；
(1) The steel used for brackets and hangers should be straight and free from significant distortion. The length deviation after cutting should be within 3mm, and there should be no curled edges or burrs at the incision;
(2) 钢支架与吊架应焊接牢固，无显著变形，焊接前厚度超过4mm的支架、铁件应打坡口，焊缝均匀平整，焊缝长度应符合要求，不得出现裂纹、咬边、气孔、凹陷、漏焊等缺陷；
(2) Steel brackets and hangers should be welded firmly without significant deformation. Brackets and iron parts with a thickness exceeding 4mm before welding should be chamfered, and the weld seam should be uniform and smooth. The weld seam length should meet the requirements and should not have defects such as cracks, undercutting, porosity, indentation, or missed welding;
(3)支架与吊架应安装牢固，保证横平竖直，在有坡度的建筑物上安装支架与吊架应与建筑物的坡度、角度一致；
(3) The brackets and hangers should be installed firmly, ensuring horizontal and vertical alignment. When installing brackets and hangers on buildings with slopes, they should be consistent with the slope and angle of the building;
支架与吊架的规格一般不应小于扁钢30mm×3mm；角钢25mm×25mm×3mm；
The specifications of brackets and hangers should generally not be less than 30mm × 3mm for flat steel and 25mm × 25mm × 3mm for angle steel;
（5）严禁用电气焊切割钢结构或轻钢龙骨任何部位；
(5) It is strictly prohibited to use electrical welding to cut any part of steel structures or light steel joists;
（6）吊具应采用定型产品，并应有各自独立的吊装卡具或支撑系统。
(6) Universal lifting devices should use standardized products and have their own independent lifting fixtures or support systems.
（7）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。
(7) The distance between fixed support points should generally not exceed 1.5-2m. Fixed support points should be set within 500mm at both ends of the entrance and exit junction boxes, boxes, cabinets, corners, bends, and deformation joints, as well as at the three ends of the T-shaped joint.
（8）严禁用木砖固定支架与吊架。
(8) It is strictly prohibited to use wooden bricks to fix brackets and hangers.
5.桥架安装
5. Bridge installation
(1) 电缆桥架水平敷设时，支撑跨距一般为1.5～3m，电缆桥架垂直敷设时固定点间距不宜大于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。支、吊架和桥架安装必须考虑电缆敷设弯曲半径满足规范小弯曲半径。见表3.1.5。
(1) When laying cable trays horizontally, the support span is generally 1.5-3m. When laying cable trays vertically, the spacing between fixed points should not exceed 2m. When the bending radius of the tray is not greater than 300mm, a support or hanger should be set on the side of the straight section 300-600mm away from the junction of the curved 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. The installation of supports, hangers, and cable trays must consider that the bending radius of cable laying meets the minimum bending radius specified in the specifications. See Table 3.1.5.
注为电缆外径。
Note the outer diameter of the cable.
(2)门型角钢支架的安装:梯型桥架沿墙垂直敷设，可使用门型角钢支架，支架的固定应尽可能配合土建施工预埋。如图3.1.5（2-1），也可在土建施工中预埋开角螺栓，用开角螺栓固定支架如图3.1.5（2-1），也可以采用膨胀螺栓固定。
(2) Installation of door type angle steel bracket: The ladder type bridge is vertically laid along the wall, and door type angle steel bracket can be used. The fixation of the bracket should be embedded as much as possible in conjunction with civil construction. As shown in Figure 3.1.5 (2-1), angle bolts can also be pre embedded in civil construction to fix the bracket as shown in Figure 3.1.5 (2-1), or expansion bolts can be used for fixation.
(3)梯型角钢支架的安装:桥架沿墙、柱水平安装时，托壁需安装在异型钢立柱上，而立柱要安装在梯型角钢支架上，使柱和墙上的桥架固定支架（或托臂）在同一条直线上。制作见图和表3.1.5（3）底架与门型架焊接时，焊角高度5mm。
(3) Installation of ladder type angle steel bracket: When the bridge is installed horizontally along the wall or column, the support wall needs to be installed on the special-shaped steel column, and the column needs to be installed on the ladder type angle steel bracket, so that the fixed bracket (or support arm) of the column and the bridge on the wall are in the same straight line. When welding the chassis and door frame as shown in Figure 3.1.5 (3), the welding angle height should be 5mm.
(4)电缆桥架立柱侧壁式安装:立柱是直接支承托臂的部件，分工字钢槽钢、角钢、异型钢立柱；立柱可以在墙上、柱上安装、也可悬吊在梁板上安装。做法在混凝土可预埋铁件；砌体可砌筑预制砌块；也可以采用膨胀螺栓但必须在混凝土强度C20或砖强度在MU10以上的砖砌体上，作法可参照3.1.5（4a、b、c、d、e、f）。
(4) Side wall installation of cable tray columns: The columns are components that directly support the support arms, and are divided into steel channel steel, angle steel, and special-shaped steel columns; Columns can be installed on walls, columns, or suspended from beams and slabs. The method involves embedding iron components in concrete; Prefabricated masonry blocks can be used for masonry construction; Expansion bolts can also be used, but they must be used on brick masonry with concrete strength C20 or brick strength above MU10. The method can refer to section 3.1.5 (4a, b, c, d, e, f).
(5)电缆桥架应敷设在易燃易爆气体管和热力管道的下方，当设计无要求时，与管道的小净距，符合3.1.5（5）的规定。
(5) Cable trays should be laid below flammable and explosive gas pipelines and thermal pipelines. When there are no design requirements, the minimum clear distance from the pipeline should comply with the provisions of 3.1.5 (5).
6 托臂安装:
Installation of Arm 6:
托臂是直接支承托盘、梯架单独固定的刚性部件，托臂有螺栓固定可预埋螺栓，也可采用膨胀螺栓，也可卡接，如图3.1.6（1）、（2）、（3）、（4）、（5）。
The support arm is a rigid component that directly supports the tray and ladder frame and is fixed separately. The support arm can be fixed with bolts that can be embedded, expansion bolts, or clamped, as shown in Figure 3.1.6 (1), (2), (3), (4), and (5).
3.2 桥架安装
3.2 Bridge installation
1.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。
1. If the length of a straight steel cable tray exceeds 30m, or if the length of an aluminum alloy or fiberglass cable tray exceeds 15m, expansion joints should be installed. Compensation devices should be installed at the expansion joint crossing points, and cable trays with expansion joints can be used.
2.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，有相互间绝缘防电化措施腐蚀措施，一般可垫石棉垫。
2. 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 the aluminum alloy bridge and the steel bracket are fixed, there are mutual insulation and corrosion prevention measures, and asbestos pads can generally be used.
3.敷设在竖井内和穿越不同防火区的桥架，应按设计要求位置，有防火隔离措施，电缆桥架在电气竖井内敷设可采用角钢固定，见图3.1.8。
3. Cable trays laid in vertical shafts and crossing different fire zones should be located according to design requirements and have fire isolation measures. Cable trays laid in electrical vertical shafts can be fixed with angle steel, as shown in Figure 3.1.8.
4.电缆桥架在穿过防火墙及防火楼板时，应采取防火隔离措施，防止火灾沿线路延燃；防火隔离墙、板，应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，同时将固定柜焊在护边角钢上；也可以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。
4. When cable trays pass through firewalls and fire-resistant floor slabs, fire-resistant isolation measures should be taken to prevent fires from spreading along the line; Fire isolation walls and panels should be equipped with reserved openings for civil construction, and edge protection 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 cabinet should be welded to the edge protection angle steel; Alternatively, the frame can be installed in the wall or slab during masonry or concrete pouring in civil construction.
3.3 桥架的接地，当设计允许利用桥架系统构成接地干线回路时，应符合下列要求:
3.3 When the design allows the use of the bridge system to form a grounding main circuit, the grounding of the bridge should meet the following requirements:
1. 金属电缆桥架及其支架引入或引出的金属电缆导管必须接地（PE）或接零（PEN）可靠，且必须符合下列规范:
1. Metal cable trays and their brackets must have reliable grounding (PE) or neutral (PEN) for the metal cable conduits introduced or led out, and must comply with the following specifications:
(1) 金属电缆桥架及其支架全长，与接地（PE）或接零（PEN）干线相连接不小于2处，使整个桥架为一个电气通路。
(1) The entire length of the metal cable tray and its support shall be connected to the grounding (PE) or neutral (PEN) main line at no less than 2 points, making the entire tray an electrical pathway.
(2) 非镀锌电缆桥架间连接的两端跨接铜芯接地线，接地线小允许截面积不小于4mm2。
(2) The two ends of the non galvanized cable tray are connected with copper core grounding wires, and the minimum allowable cross-sectional area of the grounding wire is not less than 4mm2.
(3) 镀锌电缆桥架间连接板的两端可不跨接接地线，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。
(3) The two ends of the connecting plate between galvanized cable trays may not be connected to the grounding wire, but there shall be no less than 2 fixing bolts with anti loosening nuts or anti loosening washers at both ends of the connecting plate.
2. 盘、梯架端部之间连接电阻不应大于0.00033Ω并应用等电位联结测试仪（导通仪）或微Ω表测试，测试应在连接点的两侧进行，对整个桥架全长的两端连接电阻不应大于0.5Ω或由设计决定，否则应增加接地点，以满足要求。接地孔应涂层，与涂层接触的螺栓有一侧的平垫应使用带爪的专用接地垫圈。
2. The connection resistance between the ends of the tray and ladder should not exceed 0.00033 Ω and should be tested using an equipotential bonding tester (continuity meter) or a micro Ω meter. The test should be conducted on both sides of the connection point, and the connection resistance at both ends of the entire length of the bridge should not exceed 0.5 Ω or be determined by the design. Otherwise, a grounding point should be added to meet the requirements. The grounding hole should eliminate the coating, and the flat pad on one side of the bolt in contact with the coating should use a special grounding washer with claws.
3. 伸缩缝或软连接处需采用编织铜线连接。沿桥架全长另敷设接地干线时，每段（包括非直线段）托盘、梯架应小有一点与接地干线可靠连接；在接地部位的连接处应装置弹簧垫圈，以免松动。
3. Expansion joints or soft connections should be connected using braided copper wires. When laying a grounding main line along the entire length of the bridge, each section (including non-linear sections) of the tray and ladder should be reliably connected to the grounding main line at a small point; A spring washer should be installed at the connection point of the grounding part to prevent loosening.
电缆桥架作为布线工程的一个配套项目,目前尚无专门的规范指导,个生产厂家的规格程式缺乏通用性,因此,设计选型过程应根据弱电各个系统缆显得类型、数量,合理选定适用的桥架。(1)确定方向： 根据建筑平面布置图,结合空调管线和电气管线等设置情况、方便维修,以及电缆路由的疏密来确定电缆桥架的路由。在室内,尽可能沿建筑物的墙、柱、梁及楼板架设,如许利用综合管廊架设时,则应在管道一侧或上方平行架设,并考虑引下线和分支线尽量避免交叉,如无其它管架借用,则需自设立(支)柱。
As a supporting project of wiring engineering, there is currently no specialized specification guidance for cable trays, and the specifications and programs of individual manufacturers lack universality. Therefore, the design and selection process should be based on the type and quantity of cables in various weak current systems, and the appropriate cable tray should be selected reasonably. (1) Determine direction: Determine the optimal route for cable trays based on the building layout plan, combined with the installation of air conditioning and electrical pipelines, convenient maintenance, and the density of cable routing. Indoors, try to install along the walls, columns, beams, and floor slabs of the building as much as possible. When using a comprehensive pipe gallery for installation, parallel installation should be carried out on one side or above the pipeline, and consideration should be given to avoiding crossing of down conductors and branch lines as much as possible. If there are no other pipe racks to borrow, self installing (supporting) columns is required.
(2)荷载计算：计算电缆桥架主干线纵断面上单位长度的电缆重量。
(2) Load calculation: Calculate the weight of cables per unit length on the longitudinal section of the main cable tray.
(3)确定桥架的宽度：根据布放电缆条数、电缆直径及电缆的间距来确定电缆桥架的型号、规格, 托臂的长度,支柱的长度、间距,桥架的宽度和层数。
(3) Determine the width of the cable tray: Determine the model and specifications of the cable tray, the length of the support arm, the length and spacing of the pillars, the width and number of layers of the cable tray based on the number of cables laid, the diameter of the cables, and the spacing between the cables.
(4)确定安装方式：根据场所的设置条件确定桥架的固定方式,选择悬吊式、直立式、侧壁式或是混合式,连接件和紧固件一般是配套供应的,此外,根据桥架结构选折相应的盖板。
(4) Determine installation method: Determine the fixing method of the bridge according to the setting conditions of the site, choose suspended, upright, side wall or hybrid, and the connectors and fasteners are generally supplied together. In addition, select the corresponding cover plate according to the structure of the bridge.
(5)绘出电缆桥架平、剖面图,局部部位还应绘出空间图,开列材料表。
(5) Draw a plan and section diagram of the cable tray, and also draw a spatial diagram of some parts, and list the material list.
2、如与电力电缆桥架合用时,应将电力电缆和弱电电缆各直一侧,中间采用隔板分隔。
2. When used in conjunction with power cable trays, the power cables and weak current cables should be placed on one side each, and separated by a partition in the middle.
3、弱电电缆与其它低电压电缆合用桥架时,应严格执行选择具有外屏蔽层的弱电系统的弱电电缆,避免相互间的干扰。
3. When weak current cables are used in cable trays with other low voltage cables, it is necessary to strictly select weak current cables with external shielding layers to avoid interference between them.
4、电缆桥架安装要求
4. Installation requirements for cable trays
(1)槽式大跨距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。(2)电缆桥架与用电设备交越时,其间的净距不小于0.5m。
(1) When the trough type large-span cable tray enters the building from the outside, the outward slope of the tray shall not be less than 1/100. (2) When the cable tray intersects with electrical equipment, the clear distance between them shall not be less than 0.5m.
(3)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。(4)在平行图上绘出桥架的路由,要注明桥架起点、终点、拐弯点、分支点及升降点的坐标或定位尺寸、标高,如能绘制桥架敷设轴侧图,则对材料统计将更精确。
(3) When two sets of cable trays are laid in parallel at the same height, the clear distance between them should not be less than 0.6m. (4) When drawing the routing of the tray on a parallel diagram, the coordinates or positioning dimensions and elevations of the starting point, ending point, turning point, branching point, and lifting point of the tray should be indicated. If a cable tray laying axis side diagram can be drawn, the material statistics will be more accurate.
直线段：注明全长、桥架层数、标高、型号及规格。拐弯点和分支点:注明所用转弯接板的型号及规格。升降段：注明标高变化,也可用局部大样图或剖面图表示。
Straight line segment: indicate the total length, number of bridge layers, elevation, model, and specifications. Turning and branching points: indicate the model and specifications of the turning joint used. Lifting section: indicate the elevation change, and it can also be represented by local detailed drawings or sectional drawings.
(5)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。
(5) The spacing, installation method, model specifications, and elevation of bridge support points, such as columns, brackets, or non-standard supports and structures, can be listed and explained on the plane, or segmented and marked with different sectional drawings, single line drawings, or detailed drawings.
(6)电缆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。
(6) Generally speaking, for a large number of cable leads, vertical bending plates and vertical lead frames can be used, while for a small number of cable leads, guide plates or guide pipes can be used, indicating the lead method.
(7)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,桥架内横断面的填充率不应超过50%。
(7) 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, and the filling rate of the cross-section inside the tray should not exceed 50%.
(8)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。
(8) When the cables are vertically laid in the cable tray, they should be fixed on the brackets of the tray at the upper end and every 1.5 meters. When laid horizontally, they should be fixed at the beginning, end, turn, and every 3-5 meters.
(9)在吊顶内设置时,槽盖开启面应保持80毫米的垂直净空,线槽截面利用率不应超过50%。
(9) When installed in the ceiling, the opening surface of the trough cover should maintain a vertical clearance of 80 millimeters, and the utilization rate of the trough section should not exceed 50%.
(10)布放在线槽的缆线可以不绑扎,槽内缆线应顺直,槽内缆线应顺直,尽量不交叉,缆线不应溢出线槽,在缆线进出线槽部位, 转弯处应绑扎固定。垂直线槽布放缆线应每间隔1.5米固定在缆线支架上。
(10) The cables laid in the cable trough can be left unbound. The cables inside the trough should be straight and straight, avoiding crossing as much as possible. The cables should not overflow from the trough. They should be tied and fixed at the entrance and exit of the trough, as well as at turns. The cables laid in the vertical cable tray should be fixed on the cable support every 1.5 meters.
(11)在水平、垂直桥架和垂直线槽中敷设线时,应对缆线进行绑扎。4对线电缆以24根为束,25对或以上主干线电缆、光缆及其它信号电缆应根据缆线的类型、缆径、缆线芯数分束绑扎。绑扎间距不宜大于1.5米,扣间距应均匀,松紧适度。
(11) When laying wires in horizontal and vertical cable trays and vertical trunking, the cables should be tied. 4-pair cables should be bundled with 24 cables, and 25 or more pairs of backbone cables, optical cables, and other signal cables should be bundled and tied according to the type, diameter, and number of cable cores. The binding spacing should not exceed 1.5 meters, the buckle spacing should be uniform, and the tightness should be moderate.
(12)桥架水平敷设时,支撑间距一般为1.5-3m,垂直敷设时固定在建筑物构体上的间距宜小于2m。
(12) When laying the bridge horizontally, the support spacing is generally 1.5-3m, and when laying vertically, the spacing fixed on the building structure should be less than 2m.
电缆桥架型式及品种的选择及铺设规范
Selection and laying specifications for cable tray types and varieties
一、电缆桥架型式及品种的选择
1、 Selection of cable tray types and varieties
1、需屏蔽电气干扰的电缆网路或有防护外部（如：有腐蚀液休，易燃粉尘等环境）影响的要求时，应选用（FB）类槽式复合型防腐屏蔽电缆桥架（带盖）
1. When it is required to shield cable networks from electrical interference or to protect against external influences (such as corrosive liquids, flammable dust, etc.), (FB) type slot type composite anti-corrosion shielding cable trays (with covers) should be selected
2、强腐蚀性环境应采用（F）类复合环氧树脂防腐阻燃型电缆桥架。托臂、支架也要选用同样材料，提高桥架及附件的使用寿命，电缆桥架。在容易积灰和其它需遮盖的环境或户外场所宜加盖板。
2. For highly corrosive environments, (F) type composite epoxy resin anti-corrosion and flame-retardant cable trays should be used. The same materials should be used for the support arm and bracket to improve the service life of the cable tray and accessories. Cover plates should be added in environments or outdoor places that are prone to dust accumulation and require cover.
3、除上述情况外，可根据现场还环境及技术要求选用托盘式、槽式、梯级式、玻璃防腐阻燃电缆桥架或钢质普通型桥架。在容易积灰和其它需遮盖的环境或户外场所宜加盖板。
3. In addition to the above situations, tray type, trough type, step type, glass anti-corrosion and flame-retardant cable trays or steel ordinary cable trays can be selected according to the on-site environment and technical requirements. Cover plates should be added in environments or outdoor places that are prone to dust accumulation and require cover.
4、在公共通道或户外跨越道路段，底层梯级的底部宜加垫板或在该段使用托盘 。大跨距跨越公共通道时，可根据用户要求提高桥架的载荷能力或选用行架。
4. When crossing public passages or outdoor road sections, it is advisable to add padding or use pallets at the bottom of the lower steps. When crossing public passages with large spans, the load capacity of the bridge frame can be increased or a scaffolding can be selected according to user requirements.
5、大跨距（>3m）要选用复合型桥架（FB）。
5. Composite cable trays (FB) should be selected for large spans (>3m).
6、户外要选用复合环氧树指桥架（F）。
6. Choose composite epoxy tree finger bridge (F) for outdoor use.
二、电缆桥架规格选择
2、 Selection of cable tray specifications
1、复合环氧树脂电缆桥架的宽度和高度就按下表选择，并应符合电缆真充率不超过有关标准规范的规定值，动力电缆可取40-50%，控制电缆可取50-70%，另外需予留10-25%的式程发展余量。
1. The width and height of the composite epoxy resin cable tray should be selected according to the table below, and should comply with the specified values of the cable true filling rate not exceeding the relevant standard specifications. The power cable can be taken as 40-50%, the control cable can be taken as 50-70%, and an additional 10-25% formula development margin should be reserved.
2、各种弯通及附件规格应符合工程布置条件并与桥架相配套。
2. The specifications of various bends and accessories should comply with the engineering layout conditions and be compatible with the bridge frame.
3、支、吊架规格的选择，应按桥架规格、层数、跨距等条件配置。并应满足荷载的要求。
3. The selection of support and hanger specifications should be configured according to the specifications, number of layers, span, and other conditions of the bridge frame. And it should meet the requirements of the load.
4、桥架横截面积的选择见表桥架上电缆网络中任一线路的自动过电流保护的额定电流值或整定值（A） 桥架横截面充许小值(mm2)0-60 12961-100 258101-200 452201-400 645401-600 968
4. The selection of the cross-sectional area of the cable tray is shown in the table. The rated current value or setting value of the maximum automatic overcurrent protection for any line in the cable network on the cable tray (A). The minimum allowable cross-sectional area of the cable tray (mm2) is 0-60 12961-100 258101-200 452201-400 645401-600 968
三、对于电缆桥架的支、吊架的配置
3、 Configuration of supports and hangers for cable trays
1、户内支、吊短跨距一般采取1.5-3m。户外立柱中跨距一般采取6m。
1. The short span of indoor supports and hangers is generally 1.5-3m. The mid span of outdoor columns is generally 6m.
2、非直线段的支、吊架配置就遵循以下原则。当桥架宽度<300mm时，应在距非直线段与直线结合处300-600m的直线段侧设置一个支、吊架。当桥架宽度>300mm时，除符合下述条件外，在非直线段中部还应增设一个支、吊架。
2. The configuration of supports and hangers for non-linear sections follows the following principles. When the width of the bridge is less than 300mm, a support and hanger should be installed on the side of the straight section 300-600m away from the junction of the non-linear section and the straight section. When the width of the bridge is greater than 300mm, in addition to meeting the following conditions, a support or hanger should be added in the middle of the non-linear section.
3、拉挤玻璃钢电缆桥架多层设置时层间中心距为200，250，300，350mm。
3. When setting up multiple layers of extruded fiberglass cable trays, the center distance between layers is 200250300350mm.
4、桥架直线段每隔50m应予留伸缩缝20-30mm（金属桥架）。
4. Expansion joints of 20-30mm (metal bridge) should be left every 50m in the straight section of the bridge.
四、防火：要求桥架防火的区段，必须采用钢制或不燃、阻燃材料。
4、 Fire prevention: Steel or non combustible and flame-retardant materials must be used in the sections where bridge frames are required to be fire-resistant.
五、拉挤玻璃钢电缆桥架的接地
5、 Grounding of extruded fiberglass cable tray
1、桥架系统应具有可靠的电气连接并接地（只对金属桥架）。
1. The cable tray system should have reliable electrical connections and grounding (only for metal cable trays).
2、当允许利用桥架系统构成接地干线回路时应符合下列要求。桥架端部之间连接电阻应不大于0.00033欧姆，接地孔应绝缘涂层。在1KV及以下中性点直接接地系统中，受电设备的接地与系统中性线接地相连。装有处动切断供电装轩时，桥架的级长方向金属横截面积应不小于规定值。
2. When it is allowed to use a bridge system to form a grounding main circuit, the following requirements should be met. The connection resistance between the ends of the bridge should not exceed 0.00033 ohms, and the insulation coating should be removed from the grounding hole. In a neutral point direct grounding system of 1KV and below, the grounding of the receiving equipment is connected to the neutral line grounding of the system. When installing a power cut-off device, the cross-sectional area of the metal in the longitudinal direction of the bridge should not be less than the specified value.
3、沿桥架全长另敷设接地干线时，每段（包括非直线段）桥架应少有一点与接地干线可靠连接。
3. When laying a grounding main line along the entire length of the bridge, each section (including non-linear sections) of the bridge should have at least one point reliably connected to the grounding main line.
4、对于振动场所，在接地部位的连接处应装置弹簧圈。
4. For vibration sites, spring coils should be installed at the connection of the grounding point.
六、桥架系统设计内容：桥架系统工程设计应与土建、工艺以及有关密切相配合以确定布置，其设计内容可含有：
6、 Bridge system design content: The bridge system engineering design should be closely coordinated with civil engineering, technology, and related disciplines to determine the optimal layout. Its design content may include:
1、桥架系统的有关剖面图。2、桥架系统的平面布置图。3、桥架系统所需直线段、弯通、支、吊架规格和数量的明细表以及必要的说明。4、有特殊要求的非标件技术说明或示意图。
1. Relevant sectional drawings of the bridge system. 2. Layout plan of the bridge system. 3. A detailed list of specifications and quantities of straight sections, bends, supports, and hangers required for the bridge system, along with necessary explanations. 4. Technical specifications or diagrams for non-standard parts with special requirements.
七、安装：电缆桥架的安半夜请参照建筑标准设计研究院所发行的JSJT-121全国通用建筑标准设计-电气装置标准图集《电缆桥架安装》。
7、 Installation: For the installation of cable trays, please refer to the JSJT-121 National General Building Standard Design Electrical Equipment Standard Atlas "Cable Tray Installation" issued by the China Building Standards Design and Research Institute.
八、设计要求
8、 Design requirements
1、桥架系统的路径平面布置图；
1. Layout plan of the cable tray system path;
2、桥架系统的有关断面图。
2. The relevant cross-sectional diagram of the bridge system.
3、桥架系统所用防腐材质及所需直通、弯通、支（吊）架等的规格和数量明细表以及必要的说明，连接板及螺丝、防护帽按以上要求由生产厂家配齐。4、有特殊要求的非标准技术说明或示图。
3. The anti-corrosion materials used in the bridge system, as well as the specifications and quantities of the required straight through, bent through, support (suspension) frames, and necessary explanations, shall be detailed. The connecting plates, screws, and protective caps shall be provided by the manufacturer in accordance with the above requirements. 4. Non standard technical specifications or diagrams with special requirements.
一、电缆桥架型式及品种的选择
1、 Selection of cable tray types and varieties
1、需屏蔽电气干扰的电缆网路或有防护外部（如：有腐蚀液休，易燃粉尘等环境）影响的要求时，应选用（FB）类槽式复合型防腐屏蔽电缆桥架（带盖） 2、强腐蚀性环境应采用（F）类复合环氧树脂防腐阻燃型电缆桥架。托臂、支架也要选用同样材料，提高桥架及附件的使用寿命，电缆桥架。在容易积灰和其它需遮盖的环境或户外场所宜加盖板。 3、除上述情况外，可根据现场还环境及技术要求选用托盘式、槽式、梯级式、玻璃防腐阻燃电缆桥架或钢质普通型桥架。在容易积灰和其它需遮盖的环境或户外场所宜加盖板。 4、在公共通道或户外跨越道路段，底层梯级的底部宜加垫板或在该段使用托盘 。大跨距跨越公共通道时，可根据用户要求提高桥架的载荷能力或选用行架。 5、大跨距（>3m）要选用复合型桥架（FB）。
1. When it is required to shield cable networks from electrical interference or to protect against external influences (such as corrosive liquids, flammable dust, etc.), (FB) type slot type composite anti-corrosion shielding cable trays (with covers) should be selected. 2. For highly corrosive environments, (F) type composite epoxy resin anti-corrosion and flame-retardant cable trays should be used. The same materials should be used for the support arm and bracket to improve the service life of the cable tray and accessories. Cover plates should be added in environments or outdoor places that are prone to dust accumulation and require cover. 3. In addition to the above situations, tray type, trough type, step type, glass anti-corrosion and flame-retardant cable trays or steel ordinary cable trays can be selected according to the on-site environment and technical requirements. Cover plates should be added in environments or outdoor places that are prone to dust accumulation and require cover. 4. When crossing public passages or outdoor road sections, it is advisable to add padding or use pallets at the bottom of the lower steps. When crossing public passages with large spans, the load capacity of the bridge frame can be increased or a scaffolding can be selected according to user requirements. 5. Composite cable trays (FB) should be selected for large spans (>3m).
6、户外要选用复合环氧树指桥架（F）。
6. Choose composite epoxy tree finger bridge (F) for outdoor use.
二、规格选择
2、 Specification selection
1、桥架的宽度和高度就按下表选择，并应符合电缆真充率不超过有关标准规范的规定值，动力电缆可取40-50%，控制电缆可取50-70%，另外需予留10-25%的式程发展余量。 2、各种弯通及附件规格应符合工程布置条件并与桥架相配套。 3、支、吊架规格的选择，应按桥架规格、层数、跨距等条件配置。并应满足荷载的要求。 4、桥架横截面积的选择见表 桥架上电缆网络中任一线路的自动过电流保护的额定电流值或整定值（A） 桥架横截面充许小值(mm2) 0-60 129 61-100 258 101-200 452 201-400 645 401-600 968
1. The width and height of the cable tray should be selected according to the table below, and should comply with the specified values of the cable true filling rate not exceeding the relevant standard specifications. The power cable can be taken as 40-50%, the control cable can be taken as 50-70%, and an additional 10-25% of the formula development margin should be reserved. 2. The specifications of various bends and accessories should comply with the engineering layout conditions and be compatible with the bridge frame. 3. The selection of support and hanger specifications should be configured according to the specifications, number of layers, span, and other conditions of the bridge frame. And it should meet the requirements of the load. 4. The selection of the cross-sectional area of the cable tray is shown in the table. The rated current value or setting value of the maximum automatic overcurrent protection for any line in the cable network on the tray (A). The minimum allowable cross-sectional area of the tray (mm2) is 0-60 129 61-100 258 101-200 452 201-400 645 401-600 968
三、支、吊架的配置
3、 Configuration of supports and hangers
1、户内支、吊短跨距一般采取1.5-3m。户外立柱中跨距一般采取6m。
1. The short span of indoor supports and hangers is generally 1.5-3m. The mid span of outdoor columns is generally 6m.
2、非直线段的支、吊架配置就遵循以下原则。当桥架宽度<300mm时，应在距非直线段与直线结合处300-600m的直线段侧设置一个支、吊架。当桥架宽度>300mm时，除符合下述条件外，在非直线段中部还应增设一个支、吊架。
2. The configuration of supports and hangers for non-linear sections follows the following principles. When the width of the bridge is less than 300mm, a support and hanger should be installed on the side of the straight section 300-600m away from the junction of the non-linear section and the straight section. When the width of the bridge is greater than 300mm, in addition to meeting the following conditions, a support or hanger should be added in the middle of the non-linear section.
3、桥架多层设置时层间中心距为200，250，300，350mm。
3. When setting up multiple layers of cable trays, the center distance between layers is 200250300350mm.
4、桥架直线段每隔50m应予留伸缩缝20-30mm（金属桥架）。
4. Expansion joints of 20-30mm (metal bridge) should be left every 50m in the straight section of the bridge.
四、防火
4、 Fire prevention
要求桥架防火的区段，必须采用钢制或不燃、阻燃材料。我公司生产的BJⅢ系列电缆桥架均为防火桥架。
The section requiring bridge fire prevention must be made of steel or non combustible and flame-retardant materials. The BJ III series cable trays produced by our company are all fire-resistant trays.
五、接地
5、 Grounding
1、桥架系统应具有可靠的电气连接并接地（只对金属桥架）。
1. The cable tray system should have reliable electrical connections and grounding (only for metal cable trays).
2、当允许利用桥架系统构成接地干线回路时应符合下列要求。桥架端部之间连接电阻应不大于0.00033欧姆，接地孔应绝缘涂层。在1KV及以下中性点直接接地系统中，受电设备的接地与系统中性线接地相连。装有处动切断供电装轩时，桥架的级长方向金属横截面积应不小于规定值。
2. When it is allowed to use a bridge system to form a grounding main circuit, the following requirements should be met. The connection resistance between the ends of the bridge should not exceed 0.00033 ohms, and the insulation coating should be removed from the grounding hole. In a neutral point direct grounding system of 1KV and below, the grounding of the receiving equipment is connected to the neutral line grounding of the system. When installing a power cut-off device, the cross-sectional area of the metal in the longitudinal direction of the bridge should not be less than the specified value.
3、沿桥架全长另敷设接地干线时，每段（包括非直线段）桥架应少有一点与接地干线可靠连接。
3. When laying a grounding main line along the entire length of the bridge, each section (including non-linear sections) of the bridge should have at least one point reliably connected to the grounding main line.
4、对于振动场所，在接地部位的连接处应装置弹簧圈。
4. For vibration sites, spring coils should be installed at the connection of the grounding point.
六、桥架系统设计内容
6、 Design content of bridge system
桥架系统工程设计应与土建、工艺以及有关密切相配合以确定布置，其设计内容可含有：
The design of bridge system engineering should be closely coordinated with civil engineering, technology, and relevant disciplines to determine the optimal layout, and its design content may include:
1、桥架系统的有关剖面图。
1. Relevant sectional drawings of the bridge system.
2、桥架系统的平面布置图。
2. Layout plan of the bridge system.
3、桥架系统所需直线段、弯通、支、吊架规格和数量的明细表以及必要的说明。
3. A detailed list of specifications and quantities of straight sections, bends, supports, and hangers required for the bridge system, along with necessary explanations.
4、有特殊要求的非标件技术说明或示意图。
4. Technical specifications or diagrams for non-standard parts with special requirements.
七、安装
7、 Installation
电缆桥架的安半夜请参照建筑标准设计研究院所发行的JSJT-121全国通用建筑标准设计-电气装置标准图集《电缆桥架安装》04D701-3。
For the installation of cable trays, please refer to the JSJT-121 National General Building Standard Design Electrical Equipment Standard Atlas "Cable Tray Installation" 04D701-3 issued by the China Building Standards Design and Research Institute.
八、设计要求
8、 Design requirements
1、桥架系统的路径平面布置图；
1. Layout plan of the cable tray system path;
2、桥架系统的有关断面图。
2. The relevant cross-sectional diagram of the bridge system.
3、桥架系统所用防腐材质及所需直通、弯通、支（吊）架等的规格和数量明细表以及必要的说明，连接板及螺丝、防护帽按以上要求由生产厂家配齐。
3. The anti-corrosion materials used in the bridge system, as well as the specifications and quantities of the required straight through, bent through, support (suspension) frames, and necessary explanations, shall be detailed. The connecting plates, screws, and protective caps shall be provided by the manufacturer in accordance with the above requirements.
4、有特殊要求的非标准技术说明或示图。
4. Non standard technical specifications or diagrams with special requirements.
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