Rectangular copper wire is available in a variety of sizes and specifications, depending on the intended application. The size of rectangular copper wire is usually determined by its width and thickness. The Wire Gauge (AWG) system is commonly used in the U.S. to represent wire sizes, while metric sizes are commonly used internationally.

Below are some examples of commonly used rectangular copper wire sizes, expressed in AWG and metric measurements:
AWG Size:
AWG 10 x 20: Indicates rectangular wire 10 AWG in width and 20 AWG in thickness.
AWG 15 x 25: Indicates a rectangular wire with a width of 15 AWG and a thickness of 25 AWG.



Metric sizes:
2mm x 4mm: Indicates rectangular wire with a width of 2mm and a thickness of 4mm.
5mm x 10mm: Indicates flat wire with a width of 5mm and a thickness of 10mm.

Sections from 3 to 75 mm².
IEC 60317-16, width 3 to 20 mm; thickness 1 to 5 mm.
Copper conductors and insulation UEW, PEW, EIW, EI/AIW

What is enameled flat copper wire?
Rectangular enameled copper wires are used in electric motors, generators, transformers and other low and medium voltage motors. These copper wires are available in cross-sectional areas from 3.0 to 75.0 mm2 and insulation classes from 105 to 220 degrees Celsius. Rectangular enameled copper wires are used in low and medium voltage motors such as electric motors, generators and transformers.

What are the wire sizes for transformers?
LP Industry is able to produce large transformer wires up to 22 mm wide, as well as smaller insulating tapes starting at around 2 mm thick (typically used for pancake coils). Flat enameled copper wire is available in more than 300 different sizes, from 2.0 x 0.8 to 22.0 x 8.0 mm.

What are the advantages of rectangular wires?
In the electrical industry, rectangular wires with a defined edge radius are used in motors, generators and transformers. The advantage of rectangular wires over round wires is that more compact windings can be made, thus saving space and weight. The electrical efficiency is also better, saving energy.