Transportation is strictly prohibited from high places to throw down the cable or cable tray with cable, especially at lower temperatures (generally about 5 ℃ and below), throw, drop the cable will likely lead to insulation, sheath cracking.

　　Pake as much as possible to avoid storing cables in the open air in a bare way, cable trays are not allowed to be placed flat.

　　?ó When lifting the package, it is strictly prohibited to lift several disks at the same time. In vehicles, ships and other means of transportation, cable trays should be fixed in a suitable way to prevent each other from colliding or tipping to prevent mechanical damage to the cable.

　　Singed cables are strictly prohibited from contacting with acids, alkalis and mineral oils, and should be stored in isolation from these corrosive substances. The storage of cable storage room shall not damage the insulation and corrosion of the metal of the presence of harmful gases.

　　Careful cable in the storage period, should be rolled regularly (3 months in summer, other seasons can be extended as appropriate). Rolling, will be stored down the side of the disk rolled over towards the top, so as to avoid the bottom surface of the moisture decay. When storing, always pay attention to whether the cable head is intact.

　　Selected cable storage period to the product factory period as a limit, generally should not exceed one and a half years, the longest not more than two years.

　　Fourth, the installation and construction of wire and cable

　　The design and construction of wire and cable laying and installation should be carried out in accordance with GB 50217-94 "Power Engineering Cable Design Specification" and other relevant provisions, and the use of necessary cable accessories (terminals and connectors). The operation quality, safety and reliability of the power supply system is 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 the line failure, due to construction, installation and connection and other factors caused by the failure is often much greater than the wire and cable body defects caused by the possibility of failure. Therefore, to correctly select the wire and cable and supporting accessories, in addition to the specification requirements for the design and construction, should also pay attention to the following aspects of the problem:

　　⒈ cable laying and installation should be carried out by qualified professional units or professionals, do not meet the requirements of the relevant specifications for construction and installation, may lead to the cable system can not operate normally.

　　⒈ human cable laying, should be unified command control rhythm, every 1.5 ~ 3 meters there is a person carrying the cable on the shoulder, while putting the side pulling, slowly casting.

　　3 mechanical cable laying, generally use special cable laying machine and equipped with the necessary traction tools, traction size appropriate, control uniformity, so as not to damage the cable.

　　Singing before the cable, to check the appearance of the cable and whether the head is intact, when casting attention to the direction of rotation of the cable tray, do not flatten or scrape the cable sheath, in the winter low temperature do not straighten the cable in the way of wrestling, so as to avoid the insulation, sheath cracking.

　　Be careful when laying the cable bending radius should be greater than the specified value. Before and after the installation of cable laying with 1000V megohmmeter to measure the insulation resistance between the conductors of the cable is normal, and according to the cable type specifications, length and ambient temperature of the different measurement results for appropriate corrections, small specifications (10mm 2 below the solid-core conductor) cable should also be measured whether the conductor is on and off.

　　Select Cables such as direct burial, pay attention to the soil conditions, the general building under the cable buried depth of not less than 0.3 meters, softer or more complex surrounding environment, such as arable land, building construction sites or roads, there should be a certain depth of burial (0.7 ~ 1 m) to prevent accidental damage to the direct burial of cables, if necessary, should be erected a distinctive sign.