1. Cable trays are classified into steel plates, aluminum alloys, stainless steel, fiberglass, and inorganic materials according to their material types; Classified by structure, there are ladder type, perforated tray type, non perforated tray type, etc; Classified according to fire protection requirements, there are ordinary and fire-resistant types; There are regular and energy-saving types in terms of performance classification. Steel cable trays are classified into three types based on surface protection layer: hot-dip galvanized type, composite corrosion-resistant type, and composite high corrosion-resistant (color steel) type. Among them, composite high corrosion-resistant (color steel) cable trays are a new generation of products made of color steel plates, which have the characteristics of fast installation, energy conservation, light weight, and high strength. They have been developed and produced by Shanghai Zhangxiang Electrical Complete Set Co., Ltd. The surface protection layer should be selected based on the usage environment.

2. 電纜橋架水平安裝時，宜根據在額定荷載下電纜橋架撓度不大于長度的1/200，按荷載選取跨距作支撐，且支撐點間距宜為1500～3000mm。垂直安裝時，其固定點間距不宜大于2000mm。當不能滿足要求時，宜采用大跨度電纜橋架。

When installing cable trays horizontally, it is advisable to select the optimal span as the support according to the load, and the spacing between support points should be 1500-3000mm, based on the cable tray deflection not exceeding 1/200 of its length under rated load. When installed vertically, the spacing between fixed points should not exceed 2000mm. When the requirements cannot be met, large-span cable trays should be used.

3. 除技術夾層和特殊場合外，電纜橋架水平段距地面的高度不宜低于2500mm，垂直段距地面的高度不宜低于1800mm。除在電氣專用房間內外，當不能滿足要求時，應采取防機械損傷措施。

3. Except for technical interlayer and special occasions, the height of the horizontal section of the cable tray from the ground should not be less than 2500mm, and the height of the vertical section from the ground should not be less than 1800mm. When the requirements cannot be met, measures to prevent mechanical damage should be taken, except in and outside electrical rooms.

4. 電纜橋架多層安裝時,其層間凈距離應符合下列規定:1)電力電纜橋架之間不應小于300mm。

When installing cable trays in multiple layers, the clear distance between layers should comply with the following regulations: 1) The distance between power cable trays should not be less than 300mm.

5. 電信（控制）電纜橋架與電力電纜橋架之間不應小于500mm。當有屏蔽措施時，不應小于300mm.

5. The distance between the telecommunications (control) cable tray and the power cable tray should not be less than 500mm. When there are shielding measures, it should not be less than 300mm

6. 控制電纜橋架之間不應小于200mm。

6. The distance between control cable trays should not be less than 200mm.

7. 電纜橋架上部距頂棚、樓板或梁等其他障礙物不宜小于300mm。8. 當兩組或兩組以上電纜橋架在同一高度平行安裝時，各相鄰電纜橋架之間應留有滿足維護、檢修的距離。

7. The distance between the upper part of the cable tray and other obstacles such as the ceiling, floor slab, or beam should not be less than 300mm. When two or more sets of cable trays are installed in parallel at the same height, there should be a distance between adjacent cable trays that meets maintenance and repair requirements.

9. 在電纜橋架內可以無間距敷設電纜。電纜總截面積與電纜橋架內橫斷面面積之比，電力電纜不應大于40%,控制電纜不應大于50%。10. 下列不同電壓、用途的電纜，不宜敷設在同一層的電纜橋架上:1

9. Cables can be laid without gaps within the cable tray. The ratio of the total cross-sectional area of cables to the cross-sectional area inside the cable tray should not exceed 40% for power cables and 50% for control cables. 10. The following cables with different voltages and purposes should not be laid on the same layer of cable trays: 1

）1kV以上與1kV及以下的電纜。2)向同一負荷供電的兩回路電源電纜。

）Cables above 1kV and below 1kV. 2) Two circuit power cables supplying power to the same load.

3）應急照明和其他照明的電纜。4）電力電纜與電信電纜。

3) Emergency lighting and other lighting cables. 4) Power cables and telecommunications cables.

11. 當受條件限制需敷設在同一電纜橋架上時，應采用金屬隔板隔開。12. 電纜橋架不宜安裝在熱力管道的上方及腐蝕性液體管道的下方。對于腐蝕性氣體的管道，當氣體的密度大于空氣時，宜安裝在其上方;當氣體的密度小于空氣時，宜安裝在其下方。13. 電纜橋架轉彎處的彎曲半徑，不應小于橋架內電纜更小允許彎曲半徑的值。

11. When laying on the same cable tray due to limitations, metal partitions should be used to separate them. 12. Cable trays should not be installed above thermal pipelines or below corrosive liquid pipelines. For pipelines with corrosive gases, when the density of the gas is greater than that of air, it is advisable to install them above it; When the density of the gas is less than that of air, it should be installed below it. The bending radius at the turning point of the cable tray should not be less than the maximum value of the minimum allowable bending radius of the cable inside the tray.

14. 電纜橋架不得在穿過樓板或墻壁處進行連接。

14. Cable trays shall not be connected at points where they pass through floors or walls.

15. 電纜橋架在穿越防火墻及防火樓板時,應采取防火封堵措施。

15. When cable trays pass through firewalls and fireproof floors, fire blocking measures should be taken.

16. 鋼制電纜橋架直線段長度超過30m、鋁合金或玻璃鋼制電纜橋架長度超過l5m時，宜設置伸縮節。

When the straight section length of steel cable trays exceeds 30m, and the length of aluminum alloy or fiberglass cable trays exceeds 15m, expansion joints should be installed.

17. 電纜橋架跨越建筑物變形縫時,應設置補償裝置。

When cable trays cross deformation joints in buildings, compensation devices should be installed.

18. 金屬橋架及支架、玻璃鋼制電纜橋架內專用的接地干線，其全長應不少于2處與接地保護導體(PE線)可靠連接。

18. The dedicated grounding main line inside the metal bridge and bracket, as well as the fiberglass cable bridge, should be reliably connected to the grounding protective conductor (PE line) at no less than 2 places along its entire length.

19. 熱浸鍍鋅電纜橋架之間的連接板的兩端可不跨接接地線，但連接板兩端應有不少于2個有防松螺母或防松墊圈的連接固定螺栓。

19. The two ends of the connecting plate between hot-dip galvanized cable trays may not be connected to the grounding wire, but the two ends of the connecting plate should have at least two connection fixing bolts with locking nuts or washers.

20. 非熱浸鍍鋅電纜橋架之間的連接板的兩端跨接銅芯接地線，接地線更小允許截面積不應小于4mm2。

20. The two ends of the connecting plate between non hot-dip galvanized cable trays should be connected to a copper core grounding wire, and the minimum allowable cross-sectional area of the grounding wire should not be less than 4mm2.

21. (19）戶內相同電壓的電纜并列明敷時,除敷設在電纜橋架內外，電纜之間的凈距不應小于35mm，且不應小于電纜外徑。1kV及以下電力及控制電纜與1kV以上電力電纜宜分開敷設,當需并列敷設時,其凈距不應小于150mn。

When cables of the same voltage are laid in parallel and exposed indoors, except when laid inside and outside the cable tray, the clear distance between the cables should not be less than 35mm and should not be less than the outer diameter of the cable. Power and control cables of 1kV and below should be laid separately from power cables of 1kV and above. When parallel laying is required, the clear distance should not be less than 150mn.

22. (21）電力電纜在橋架內敷設，不宜超過40%，控制電纜不宜超過50%。

22. (21) Power cables should be laid inside the bridge, with a plot ratio not exceeding 40%, and control cables not exceeding 50%.