The grounding wire of the cable tray is a directly grounded conductor, which can also be called a circuit. When a hazard occurs, it is considered a lifeline by delivering high pressure directly to the ground. Therefore, it is very important to protect the ground wire of cable tray.
Poor insulation or humid environment will lead to a certain amount of static electricity in the shell of tray type cable tray equipment, and electric shock accidents will occur in serious cases. In order to prevent accidents, the wire can be connected to the metal surface of the bridge type trunking and the other end of the wire can be grounded. If the cable leaks electricity, the ground wire will ground the power supply and release it.
How to protect the grounding wire in Shandong cable tray system?
When unexpected voltage is applied to disconnected equipment and lines, it is an important tool for protecting and certifying operators. According to the relevant regulations issued, the grounding wire of cable tray needs to use bare copper flexible wire with a diameter of more than 4mm.
When the tray type cable grounding system is used, the following requirements shall be met:
1. The contact resistance of end joints of trunking type cable tray, bridge type cable tray and ladder type cable tray shall not be greater than 0.00033. The grounding hole shall not have insulating coating.
2. Braided copper wire for expansion joint or continuous hinge. The cross-sectional area shall be determined according to the actual grounding system of the project and the current relevant national standards.
3. When laying the ground wire along the full length of the bridge type bridge, all sections (including non straight sections) of the bridge type bridge and trapezoidal bridge shall be firmly connected with the ground wire ground wire
4. The connecting bolts of the grounding part shall be provided with washers.