Why should the cable tray be grounded?

1、电缆桥架系统应具有可靠的电气连接并接地（只对金属桥架）。

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

2、当允许利用桥架系统构成接地干线回路时应符合下列要求。桥架端部之间连接电阻应不大于0.00033欧姆，接地孔应清理掉绝缘涂层。在1KV及以下中性点直接接地系统中，受电设备的接地与系统中性线接地相连。装有处动切断供电装轩时，桥架的级长方向金属横截面积应不小于规定值。

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、沿桥架全长另敷设接地干线时，每段（包括非直线段）桥架应少有一点与接地干线可靠连接。

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、对于振动场所，在接地部位的连接处应装置弹簧圈。

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