Why should the cable tray be grounded?

1、電纜橋架系統應具有可靠的電氣連接并接地（只對金屬橋架）。

1. The cable tray system shall have reliable electrical connection and grounding (only for metal tray).

2、當允許利用橋架系統構成接地干線回路時應符合下列要求。橋架端部之間連接電阻應不大于0.00033歐姆，接地孔應清理掉絕緣涂層。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相連。裝有處動切斷供電裝軒時，橋架的級長方向金屬橫截面積應不小于規定值。

2. When the bridge system is allowed to form the grounding trunk circuit, the following requirements shall be met. The connection resistance between bridge ends shall not be greater than 0.00033 ohm, and the insulation coating shall be removed from the grounding hole. In the neutral point direct grounding system of 1kV and below, the grounding of power receiving equipment is connected with the neutral line grounding of the system. When a power cut-off device is installed, the metal cross-sectional area in the level direction of the bridge shall not be less than the specified value.

3、沿橋架全長另敷設接地干線時，每段（包括非直線段）橋架應少有一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 section (including non-linear section) of the 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.