Installation and construction of wire and cable

Installation and construction of wire and cable

Installation and construction of wire and cable

The design and construction of the laying and installation of wires and cables shall be carried out in accordance with GB 50217-94 "Code for Design of Electric Power Engineering Cables" and other relevant regulations, and the necessary cable accessories (terminals and connectors) shall be used. The operation quality, safety and reliability of the power supply system are not only related to the quality of the wire and cable itself, but also to the construction quality of the cable accessories and lines.

Through the statistical analysis of line faults, the faults caused by factors such as construction, installation and connection are often much more likely than the faults caused by the defects of the wire and cable itself. Therefore, in order to correctly select wires and cables and supporting accessories, in addition to the design and construction according to the requirements of the specification, the following aspects should also be paid attention to:

Cable laying and installation should be carried out by qualified professional units or professionals. Construction and installation that do not meet the requirements of relevant specifications may cause the cable system to fail to operate normally.
When laying cables manually, the command and control rhythm should be unified. Every 1.5 to 3 meters, one person should carry the cables on their shoulders, pull them while laying them down, and release them slowly.
When mechanically laying cables, special cable laying machines are generally used and necessary traction tools are used. The traction force is appropriate and the control is even, so as not to damage the cables.
Before laying the cable, check the appearance of the cable and whether the head is intact. Pay attention to the rotation direction of the cable drum when laying the cable. Do not flatten or scratch the outer sheath of the cable. Insulation, sheath cracking.
When laying, the bending radius of the cable should be larger than the specified value. Before and after the cable is laid and installed, use a 1000V megger to measure whether the insulation resistance between the conductors of the cable is normal, and make appropriate corrections to the measurement results according to the cable model, length and ambient temperature. Core conductor) cable should also measure whether the conductor is on or off.
If the cables are laid directly, pay attention to the soil conditions. Generally, the buried depth of the cables under the buildings is not less than 0.3 meters. If the cables are softer or the surrounding environment is more complicated, such as arable land, construction sites or roads, etc., there must be a certain burial depth. (0.7 to 1 meter) to prevent accidental damage to the directly buried cable, and a clear sign should be erected if necessary.

Cable model name

YJV—Copper core XLPE insulated PVC sheathed power cable.

ZR-YJV—Copper core XLPE insulated PVC sheathed flame retardant power cable.

NH-YJV—Copper core XLPE insulated PVC sheathed fire-resistant power cable.

VV—Copper core cross-linked vinyl chloride insulated PVC sheathed power cable.

ZR-VV—Copper core PVC insulated PVC sheathed flame retardant power cable.

NH-VV—Copper core PVC insulated PVC sheathed fire-resistant power cable.

DDZ-YJV—Copper core XLPE insulated PVC sheathed low smoke and low halogen flame retardant power cable.

WDZ-YJV—Copper core XLPE insulated PVC sheathed low smoke halogen free flame retardant power cable.

DDZ-VV—Copper core PVC insulated PVC sheathed low smoke and low halogen flame retardant power cable.