1. As a supporting project of wiring engineering, cable tray has no special specification guidance at present, and the specification form of each manufacturer lacks universality. Therefore, the design and selection process should reasonably select the appropriate cable tray according to the cable type and quantity of each electrical system.

(1)確定方向根據(jù)建筑平面布置圖,結(jié)合空調(diào)管線和電氣管線等設(shè)置情況、方便維修，以及電纜路由的疏密來確定電纜橋架的路線。在室內(nèi)，盡可能沿建筑物的墻、柱、梁及樓板架設(shè)，如許利用綜合管廊架設(shè)時(shí)，則應(yīng)在管道一側(cè)或上方平行架設(shè)，并考慮引下線和分支線盡量避免交叉，如無其它管架借用，則需自設(shè)立(支)柱。

(1) Determine the direction according to the building layout plan, combined with the setting of air conditioning pipelines and electrical pipelines, convenient maintenance, and cable route density to determine the route of cable tray. Indoor, it is best to install along the walls, columns, beams, and floors of the building. If using a comprehensive pipe gallery for installation, it should be installed parallel on one side or above the pipeline, and consideration should be given to avoiding the intersection of down conductors and branch lines as much as possible. If there are no other pipe racks to borrow, self installation (support) columns are required.

(2)荷載計(jì)算計(jì)算電纜橋架主干線縱斷面上單位長度的電纜重量。

(2) Load calculation calculates the weight of cable per unit length on the vertical section of cable tray trunk line.

(3)確定橋架的寬度根據(jù)布放電纜條數(shù)、電纜直徑及電纜的間距來確定電纜橋架的型號(hào)、規(guī)格、托臂的長度,支柱的長度、間距,橋架的寬度和層數(shù)。

(3) Determine the width of the cable tray. Determine the model, specification, arm length, pillar length, spacing, width and layers of the cable tray according to the number of cables laid, cable diameter and cable spacing.

(4)確定安裝方式根據(jù)場(chǎng)所的設(shè)置條件確定橋架的固定方式，選擇懸吊式、直立式、側(cè)壁式或是混合式，連接件和緊固件一般是配套供應(yīng)的，此外，根據(jù)橋架結(jié)構(gòu)選擇相應(yīng)的蓋板。

(4) Determine the installation method based on the setting conditions of the site to determine the fixing method of the bridge. Choose the suspension type, vertical type, side wall type, or hybrid type, and the connectors and fasteners are generally supplied together. In addition, select the corresponding cover plate according to the bridge structure.

(5)繪出電纜橋架平、剖面圖，局部部位還應(yīng)繪出空間圖，開列材料表。

(5) Plan and section drawings of cable tray shall be drawn, and space drawings and material lists shall be drawn for local parts.

2、如與電力電纜橋架合用時(shí)，應(yīng)將電力電纜和弱電電纜各直一側(cè)，中間采用隔板分隔。

2. If it is used together with the power cable tray, the power cable and weak current cable shall be separated by a partition on each straight side.

3、弱電電纜與其它低電壓電纜合用橋架時(shí)，應(yīng)嚴(yán)格執(zhí)行選擇具有外屏蔽層的弱電系統(tǒng)的弱電電纜，避免相互間的干擾。

3. When using a bridge with weak current cables and other low-voltage cables, strict selection of weak current cables with external shielding layers should be carried out to avoid mutual interference.

4、其它安裝

4. Other installations

(1)電纜橋架由室外進(jìn)入建筑物內(nèi)時(shí)，橋架向外的坡度不得小于1100。

(1) When the cable tray enters the building from the outside, the outward slope of the cable tray shall not be less than 1100.

(2)電纜橋架與用電設(shè)備交越時(shí)，其間的凈距不小于0.5m。

(2) When the cable tray crosses the electrical equipment, the clear distance between them shall not be less than 0.5m.

(3)兩組電纜橋架在同一高度平行敷設(shè)時(shí)，其間凈距不小于0.6m。

(3) When two groups of cable tray are laid in parallel at the same height, the clear distance between them shall not be less than 0.6m.

(4)在平行圖上繪出橋架的路由,要注明橋架起點(diǎn)、終點(diǎn)、拐彎點(diǎn)、分支點(diǎn)及升降點(diǎn)的坐標(biāo)或定位尺寸、標(biāo)高，如能繪制橋架敷設(shè)軸側(cè)圖，則對(duì)材料統(tǒng)計(jì)將更準(zhǔn)確。

(4) Draw the route of the cable tray on a parallel diagram, indicating the coordinates or positioning dimensions and elevations of the starting point, ending point, turning point, branch point, and lifting point of the cable tray. If a cable tray laying axis side diagram can be drawn, the material statistics will be more accurate.