When installing the cable tray, one operation step is to install the grounding, and this installation operation must be carried out correctly, otherwise once the wiring error will seriously affect the later use safety. So let's talk about some precautions when changing the bridge grounding installation.
1. The cable tray system shall have reliable electrical connection and grounding (only for metal tray).
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 insulating 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. When another grounding main line is laid along the whole length of the cable tray, at least one point of each section (including non-linear section) of the tray shall be reliably connected with the grounding main line.
4. For vibration places, spring coils shall be installed at the connection of grounding parts.
Therefore, when installing the cable tray grounding, we must pay more attention to the above contents, and carry out the grounding operation in strict accordance with the correct methods and steps, so as to better and faster complete the bridge grounding installation operation.