The design and construction of cable laying installation should be carried out according to the "GB 50217-94 power cable engineering design specifications" and other relevant provisions, and the cable accessories necessary (terminals and joints). The operation of power supply system of quality, safety and reliability is not only related with the quality of wire and cable, and cable accessories and line construction quality.
According to the statistical analysis of line fault, fault fault caused much more possibility for construction, installation and connection and other factors tend to do better than the cable body defects. Therefore, to properly use cables and accessories, in addition to the design and construction according to the specification, but also should pay attention to the following aspects:
The cable laying installation must be performed by a qualified professional institutions or professional personnel, not in conformity with the relevant provisions of specification requirements of construction and installation, may lead to abnormal running of the cable system.
The human to the laying of cables should be unified command rhythm control, every 1.5 ~ 3 meters with one shoulder cable, pull put side, slowly casting.
HAZOP machinery casts a cable, the general use of special cable laying machine and equipped with the necessary traction tool, the traction force appropriate size and uniformity control to avoid any damage to the cables.
The cast of the cable, to check the appearance of the cable and head are in good condition, when the cast pay attention to the cable tray rotation direction, not flattening or scrape wound cable outer sheath, in the low temperature in winter never to beating to straighten the cable, lest insulation and sheath crack.
The bending radius of cable laying is greater than the specified value. In the installation of cable laying, 1000V megohm table measuring cable between each conductor insulation resistance is normal, and in accordance with the cable types of specifications, the length and the ambient temperature is different on the measurement results are properly corrected, small size (10mm below 2 solid core conductors) cable should be measured volume conductor whether on-off.
The cables, such as directly buried installation, attention should be paid to the soil conditions, general building cable of the buried depth of not less than 0.3 meters, a soft or the surrounding environment is complex, such as farmland, construction sites, road and so on to the buried depth (0.7 ~ 1 m), to prevent direct buried cable accidental damage, if necessary should be obvious signs erected.
