The square of the conductor is actually marked by the cross-sectional area of the conductor, that is, the area of the circular cross-section of the conductor, in square millimeters.
For unmarked wires, experienced electricians can see the square number of wires by visual inspection.
This formula can be used to calculate how much current, how much voltage, how many lengths of wires and how many squares of wires are used.
The square of the wire refers to the nominal cross-sectional area of the wire conductor, that is, the size of the wire. Common specifications of wires are: 1.5, 2.5, 4.0, 6.0 square meters and millimeters. The nominal value is large, the conductor is large, and it can load the circuit current, so the power is large.
Wire refers to the wire that transmits electric energy. There are bare wires, electromagnetic wires and insulated wires. Bare wires have no insulation, including copper-aluminum flat wires, overhead stranded wires and various profiles (such as special-shaped wires, buses, copper bars, aluminum bars, etc.). ). Mainly used for outdoor overhead and indoor buses and switch boxes. Electromagnetic wire is an insulated wire that generates a magnetic field or induces a current in the magnetic field after being electrified. It is mainly used for windings of related electromagnetic equipment such as motors and transformers. Its conductor is mainly copper wire, with thin insulation layer and good electrical and mechanical properties, as well as heat resistance, moisture resistance and solvent resistance. Different characteristics can be obtained by selecting different insulating materials.
References:
Baidu encyclopedia-electric wire