There are many key points to understand for trough type cable tray. Today, let's talk about its grounding points.

1.槽式電纜橋架系統應有可靠的電氣連接并接地。

1. Trough type cable tray system shall have reliable electrical connection and grounding.

2.當允許利用槽式電纜橋架系統構成接地干線回路時，要符合以下要求。橋架端部之間連接電阻不能大于0.00033歐姆，要清理接地孔的絕緣涂層。在1KV及以下中性點直接接地系統中，受電設備的接地與系統中性線接地要保持相連。

2. When the trough cable tray system is allowed to form the grounding trunk circuit, the following requirements shall be met. The connection resistance between the ends of the bridge shall not be greater than 0.00033 ohm, and the insulating coating of the grounding hole shall be cleaned. In the neutral point direct grounding system of 1kV and below, the grounding of power receiving equipment shall be connected with the neutral line grounding of the system.

3.沿槽式電纜橋架全長另敷設接地干線時，要保證每段橋架有少一點與接地干線可靠連接。

3. When laying another grounding main line along the whole length of the trough cable tray, ensure that at least one point of each cable tray is reliably connected with the grounding main line.

4.對于振動場所，要求在它的接地部位連接處安裝彈簧圈。

4. For vibration places, it is required to install spring rings at the connection of its grounding parts.

線槽橋架安裝工藝要點

Key points of installation process of trunking and Bridge

1.平直線段橋架吊架間距1.5m~2m，如果采用吊桿支架，吊桿直徑不應小于8mm，且需在過梁處應設置固定支架。

1. The distance between the bridge hangers in the straight section is 1.5m ~ 2m. If the suspender support is used, the diameter of the suspender shall not be less than 8mm, and the fixed support shall be set at the lintel.

2.轉彎處兩邊各設一組吊架，且兩組吊架對稱布置，間距不大于1.5米，否則轉彎中間位置增設一組吊架。

2. A group of hangers shall be set on both sides of the turn, and the two groups of hangers shall be arranged symmetrically with a spacing of no more than 1.5m, otherwise a group of hangers shall be added in the middle of the turn.

3.轉彎處兩邊各設一組吊架，且兩組吊架對稱布置，間距不大于1.5米，否則轉彎中間位置增設一組吊架；橋架距樓板距離不小于150mm，上下層橋架間距不小于150mm。

3. A group of hangers shall be set on both sides of the turn, and the two groups of hangers shall be symmetrically arranged with a spacing of no more than 1.5m, otherwise a group of hangers shall be added in the middle of the turn; The distance between the top tray and the floor slab shall not be less than 150mm, and the distance between the upper and lower trays shall not be less than 150mm.

4.橋架、線槽按砼特殊角度準確放樣、加工、安裝。

4. The bridge and trunking shall be accurately set out, processed and installed according to the special angle of concrete.

5.直線段鋼制電纜橋架長度超過30米、鋁合金或者玻璃鋼制電纜橋架長度超過15米設有伸縮節；電纜橋架跨越建筑物變形縫處設置補償裝置。

5. The length of steel cable tray in straight section exceeds 30m, and the length of aluminum alloy or FRP cable tray exceeds 15m, with expansion joints; Compensation device shall be set at the deformation joint where the cable tray crosses the building.

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