Enameled electrical wire

coatingcopperpolyurethane

Enamelled copper wire is copper wire covered with varnish, enamel, coating. This coating can be of different material, such as polyester, polyurethane, polyimide, etc. The table below shows the type of varnish according to the temperature to which the wires must withstand in operation. We have drawn up a non-exhaustive list of applications requiring this type of wire, depending on the temperature. The joined enamelled wires form what are called Litz wires. This type of wire is a polished annealed electrolytic copper wire (99%), made with Cu-ETP. It is in fact annealed copper, that is to say relatively malleable, the properties of which must allow an elongation of up to 25%. The wires are covered with a layer of enamel, a coating. This enamel layer can be of different material, which will be chosen according to the maximum temperature to withstand. This type of wire can be used in various fields, such as electronics or winding, depending on the type: The enamelled conductor is therefore defined according to whether it is weldable or not, according to the temperature class and according to the number of layers of varnish. - The temperature indices are called thermal class, and indicate the temperature at which the copper wires can operate for about 20,000 hours.​ - Polyurethanes can be welded. In theory, this does not require stripping beforehand. This is because the coating layer evaporates with heat. This is called weldable. They can also be of different colors (black, purple, green, blue) but are mostly red or yellow.