Basic Knowledge Of Wire And Cable

Wires and cables are mainly divided into five categories: bare wires, electromagnetic wires, power cables, wires and cables for electrical equipment and communication cables. Different types of wires and cables have different definitions and functions. Let's take a look at the common types of wires and cables.

Bare wire is a kind of wire without insulation package, which is mainly used for outdoor overhead.

Electromagnetic wire refers to the wire used on the electromagnetic coil, which are all electromagnetic wires. Electromagnetic wire has high requirements for wire process, and needs to adapt to harsh environments such as strong vibration, centrifugation, high temperature, corrosion and so on.

Power cables are mainly used to transmit and distribute electric energy. The utility model is characterized in that oil paper, rubber or plastic are wrapped on the conductor. The cable has corrosion resistance, strong insulation, can withstand high voltage and low requirements for service environment.

Wires and cables for electrical equipment are commonly used in daily life. They are mainly used to assemble electrical equipment and instruments and divert electric energy.

Communication cable is mainly used to transmit TV, telephone, network and broadcast signals. It has the characteristics of large signal capacity and strong anti-interference ability.

There are three types of cable trays: jumper tray, which is generally used for large-diameter cables such as power cables. Trough type straight through bridge is generally used for communication cables such as network, communication and fire protection, and tray type straight through bridge is used for power cables and signals, with a wide range of applications.

Electrical accessories required for cable laying include cable terminal junction box, cable intermediate junction box, connecting pipe and terminal, steel plate connecting groove, cable bridge, etc,

When selecting wires and cables, generally pay attention to the following problems:

1. The rated voltage of the wire is 1.5 times higher than the actual voltage.

2. The current carrying capacity of the conductor is generally more than 1.5 times the actual current.

3. When laying long cables, the voltage drop shall be calculated according to the length.

4. The conductor needs to bear the voltage and current when the protective device acts.