Groove type cable tray grounding points:

　　1、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 bridge system should have reliable electrical connection and grounding (only for metal bridge).

　　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 allowed to use bridge system grounding main circuit, shall meet the following requirements. Connection between the bridge end resistance should be no greater than 0.00033 ohms, grounding insulation coating shall be removed. In the neutral point grounding system directly 1 kv and below, from electrical equipment grounding connected to the neutral grounding system. Move to cut off the power supply is installed with a place porch, prefect direction of bridge metallic cross-sectional area shall be not 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, along the bridge span laying grounding line, other (including the straight segment) for each bridge should be at least a little and reliable grounding line connection.

　　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 place, in the joint of ground parts should be spring coil.

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