In the process of power installation and construction, the equipment in the electric room is often connected by cable bridge, which is convenient for construction and can ensure the connection reliability and power safety. However, there are many specifications and types of cable trays. How to choose the appropriate cable tray.

一、 電纜橋架的型式及品種

1、 Type and variety of cable tray

1、 需要屏蔽電氣干擾或要求有外部防護時，應該選用槽式復合型防腐屏蔽電纜橋架。

1. When it is necessary to shield electrical interference or external protection is required, grooved composite anti-corrosion shielded cable tray shall be selected.

2、 強腐蝕性環境要采用復合環氧樹脂防腐阻燃型電纜橋架。托臂、支架也要選用同樣材料。

2. Composite epoxy resin anti-corrosion and flame retardant cable tray shall be used in highly corrosive environment. The same materials shall be used for supporting arm and support.

3、 在公共通道或戶外跨越道路段，底層梯級底部可以加墊板或使用托盤。大垮距跨越通道時，可以根據用戶要求提高橋架荷載能力，或使用行架。

3. In the public passage or outdoor crossing road section, the base plate or pallet can be added at the bottom of the bottom step. When crossing the channel with large collapse distance, the load capacity of the bridge can be improved according to the user's requirements, or the traveling frame can be used.

4、 大跨距要用復合型橋架。

4. Composite bridge shall be used for large span.

5、 戶外盡量使用復合環氧樹脂橋架。

5. Composite epoxy resin bridge shall be used outdoors as far as possible.

二、 電纜橋架規格

2、 Cable tray specification

1、 電纜橋架的電纜真充率要符合相關標準，動力電纜可取40~50%，控制電纜可取50~70%，另外需預留10~25%的發展余量。

1. The true charging rate of the cable tray shall meet the relevant standards, 40 ~ 50% for the power cable and 50 ~ 70% for the control cable. In addition, 10 ~ 25% of the development allowance shall be reserved.

2、 彎通及附件規格要符合工程布置條件要和橋架相配套。

2. The specifications of bends and accessories shall meet the engineering layout conditions and be matched with the bridge.

3、 支、吊架規格的選擇，應按橋架的規格、層數、跨距等配置。

3. The specifications of supports and hangers shall be selected according to the specifications, layers and spans of the bridge.

三、 電纜橋架的支、吊架的配置

3、 Configuration of supports and hangers of cable tray

1、 戶內支、吊短跨距一般采取1.5~3m，戶外立柱跨距一般采取6m。

1. The short span of indoor support and crane is generally 1.5 ~ 3M, and the span of outdoor column is generally 6m.

2、 非直線段的支、吊架要遵循以下原則，當橋架寬度<300mm時，在非直線段與直線結合處設置一個支、吊架。當寬度>300mm時，還要在非直線中部增設一個支、吊架。

2. The supports and hangers of non-linear section shall follow the following principles. When the bridge width is less than 300mm, one support and hanger shall be set at the junction of non-linear section and straight line. When the width is > 300mm, a support and hanger shall be added in the middle of the non-linear.

3、 拉擠玻璃鋼電纜橋架多層設置時，層間距為200、250、350mm。

3. When the pultruded FRP cable tray is set in multiple layers, the center distance between layers is 200, 250 and 350mm.

4、 橋架直線段每隔50m應予留伸縮縫20~30mm。

4. 20 ~ 30mm expansion joints shall be reserved every 50m in the straight section of the bridge.

四、 防火接地

4、 Fireproof grounding

1、 橋架要有一定的防火、阻燃能力，部分地區還要求采用鋼制或不燃材料。

1. The bridge shall have certain fire prevention and flame retardant capacity, and steel or non combustible materials are required in some areas.

2、 金屬橋架要具有可靠的接地連接。

2. The metal bridge shall have reliable grounding connection.

3、 沿橋架全長另敷設接地干線時，每段橋架少要有一個點與接地干線可靠連接。

3. When another grounding main line is laid along the whole length of the bridge, at least one point of each bridge shall be reliably connected with the grounding main line.

4、 對于振動場所，在接地部位的連接處應裝置彈簧圈。

4. For vibration places, spring coils shall be installed at the connection of grounding parts.

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