First, how to identify the advantages and disadvantages of wires
1. Identify the structural dimensions of Copper (aluminum) conductors, insulation layers and sheathing layers of wires;
2. The material of the identified wires should be bright, flexible, flexible, and have a shiny and flexible copper (aluminum) core;
3. The surface of the wire is printed with the manufacturer's name (trademark), model number, voltage level, CCC certification, etc.
4. According to the length of the wire to determine the amount of wire to meet the requirements;
5, the product packaging should be neat, beautiful, packaging has no certificate or other certification marks. The certificate marked product model, specifications, rated voltage, implementation of standards, length, inspection staff number, production date and certification mark.
Second, install the wire and cable seven matters needing attention
1. The construction personnel who install the wires should be specially trained and qualified electricians;
2. Ordinary power cables are suitable for air laying or buried under natural drainage conditions. They are not suitable for submarine cables or in submerged environments (special design);
3, for plastic insulated cables, the ambient temperature during installation should not be lower than 0 °C. Only when the cable and ambient temperature are above 0 °C can be installed;
4, the cable should be far away from the boiler, heat pipe, resistors and other heat sources, otherwise the cable has the danger of damage due to heat;
5. Measures shall be taken before and during installation to prevent the cable from mechanical damage;
6, if the cable is laid through the pipe, the pipe with suitable size shall be used;
7. Directly buried in the underground cable, the general option is armored cable, according to the soil acidity and alkalinity, choose the type of cable.
Third, storage and transportation
1, when the cable can not be laid and stored immediately, it should be placed in a dry, ventilated place;
2. The cable tray is not allowed to be placed horizontally;
3. To prevent the cable from getting wet, the caps on both ends of the cable can only be removed by installing the cable. When the cap is removed, both ends of the cable should not be exposed to moisture;
4. During storage, pay attention to avoid water soaking in the cable core. When there is water in the conductor and in the outer layer of the insulation, it will cause cable aging;
5. Cable transport and loading and unloading should be performed by professionals who are familiar with the performance and installation of cables. It is forbidden to lay the cable trays flat during transportation so as not to crush the cables.
6. When rolling the cable tray, it should be rolled in the opposite direction of the cable head;
7. During transportation, pay attention to prevent moisture from immersing into the cable core. When there is water in the conductor and on the outer layer of the edge, it will lead to cable aging.
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