Enameled Copper wire is a wire coated with a thin layer of insulation to prevent the wire surfaces from being in a short circuit when wound into coils. Magnetic flux is created when current flows through the coil. It is used mainly in the construction of motors, electromagnets, transformers and inductors. For ease of manufacturing inductive components like transformers and inductors, most of these wires are self solderable polyurethane 155 deg C.

Enameled wires are classified by their diameter (SWG) Standard Wire Gauge number or millimetres, temperature class and insulation thickness. A thicker insulation layer results in a higher breakdown voltage BDV. Common temperature classes are 130, 155, 180 and 200°C.