Wire and cable are materials used for power-related transmission purposes. There is no strict boundary between "wire" and "cable". Generally speaking, products with a small number of cores, small product diameter, and simple structure are called wires, those without insulation are called bare wires, and others are called cables. So, do you know everything about the specifications of wires and cables and the key points of construction and installation?

1. Selection of wire and cable model specifications:

1. Selection of wire and cable models:

Depending on the purpose, power, overhead insulation, control cables, etc. can be selected;

Depending on the layout conditions, general plastic insulation, steel tape armoring, steel wire armoring, anti-corrosion cables, etc. can be used;

According to safety requirements, you can choose non-flame-retardant, flame-retardant, halogen-free flame-retardant, fire-resistant cables, etc. ​

2. Selection of wire and cable specifications:

When determining the usage specifications of wires and cables (conductor cross-section), selection conditions such as heat and voltage loss, economic current density, and mechanical strength should usually be considered. Experience shows that due to the large load current of low-voltage power lines, the cross-section is generally selected according to the heating conditions, and then the voltage loss and mechanical strength are checked. Low-voltage lighting lines have high voltage level requirements. You can first select a profile based on the allowable voltage loss conditions and then check the thermal conditions and mechanical strength. For high-voltage circuits, first select the cross-section according to the economic current density, and then check the heating conditions and allowable voltage loss. High voltage overhead lines also need to be checked for mechanical strength.

2. Transportation and storage of wires and cables:

1. During transportation, it is strictly prohibited to drop cables or cable trays containing cables from high places. Especially at lower temperatures (usually around 5), throwing or dropping cables can cause insulation and external cracks.

2. Please do not store it exposed to the open air. The cable tray cannot be placed flat and must be placed upright.

3. When lifting packages, it is strictly prohibited to lift multiple boards at the same time. In vehicles, ships and other transportation vehicles, cable trays must be fixed with appropriate methods to prevent collisions or rollovers, and to prevent mechanical damage to the cables.

4. Contact with acid, alkali and mineral oil should be strictly prohibited, and should be kept in isolation from these corrosive substances. There should be no harmful gases that corrode insulation and metal in the warehouse where cables are stored.

5. It must be rolled regularly during the storage period (once every 3 months in summer, and can be postponed appropriately in other seasons). When rolling, turn the edge of the bottom storage box upward to prevent the bottom from getting wet. Always pay attention to whether the cable head is damaged during storage.

6. The storage period is based on the factory date of the product, which generally does not exceed one and a half years, and the longest does not exceed 2 years.

3. Installation and construction of wires and cables:

The layout, installation, design and construction of wires and cables should adopt necessary cable accessories in accordance with relevant regulations. The operation quality, safety and reliability of the power supply system are not only related to the quality of the wires and cables themselves, but also to the construction quality of the cable accessories and circuits.