There are many key points to understand for trough type cable tray. Today, let's talk about its grounding points.
1. Trough type cable tray system shall have reliable electrical connection and grounding.
2. When the trough cable tray system is allowed to form the grounding trunk circuit, the following requirements shall be met. The connection resistance between the ends of the bridge shall not be greater than 0.00033 ohm, and the insulating coating of the grounding hole shall be cleaned. In the neutral point direct grounding system of 1kV and below, the grounding of power receiving equipment shall be connected with the neutral line grounding of the system.
3. When laying another grounding main line along the whole length of the trough cable tray, ensure that at least one point of each cable tray is reliably connected with the grounding main line.
4. For vibration places, it is required to install spring rings at the connection of its grounding parts.
Key points of installation process of trunking and Bridge
1. The distance between the bridge hangers in the straight section is 1.5m ~ 2m. If the suspender support is used, the diameter of the suspender shall not be less than 8mm, and the fixed support shall be set at the lintel.
2. A group of hangers shall be set on both sides of the turn, and the two groups of hangers shall be arranged symmetrically with a spacing of no more than 1.5m, otherwise a group of hangers shall be added in the middle of the turn.
3. A group of hangers shall be set on both sides of the turn, and the two groups of hangers shall be symmetrically arranged with a spacing of no more than 1.5m, otherwise a group of hangers shall be added in the middle of the turn; The distance between the top tray and the floor slab shall not be less than 150mm, and the distance between the upper and lower trays shall not be less than 150mm.
4. The bridge and trunking shall be accurately set out, processed and installed according to the special angle of concrete.
5. The length of steel cable tray in straight section exceeds 30m, and the length of aluminum alloy or FRP cable tray exceeds 15m, with expansion joints; Compensation device shall be set at the deformation joint where the cable tray crosses the building.
The above is the detailed introduction of Shandong cable tray, which I hope will help you If you have any questions, please contact us We will provide you with professional service http://www.sdhangfeng.com