UL approved 24 swg gauge copper magnet wire, 1.0 lb, 0.0221" Diameter, 803' Length, Red, which is also used in electrical equipment. This type of wire is typically used to connect electrical components, such as motors and generators.

Conductor: 99.99% pure copper conductor
Wire Gauge: 24 SWG, 
Overall Diameter: 0.629mm ±0.024mm, 
Resistance Per Meter: 0.0703 
Ohm Approximate, Current Capacity: 970mA Approximate, 
class 220, class 200, class 180
ROHS heat resistant UEW 

For copper wires an 8 mm copper rod (5/16″ in USA) is used as raw material, which is drawn through drawing dies to the required bare wire dimension in several stages. The copper rod has to be of high purity and consistenly high quality to manufacture fine and ultrafine wires of sizes below 10 µm.

LP Industry specializes in fine magnet wire diameter and offers a wide range of products from 0.008 mm (8 microns) to 0.50 mm with many different enamel types on different magnet wires

What are the international standards for magnet wires?
International standards like IEC group magnet wires according to ranges of specific outer diameters. IEC groups the insulation in Grade 1, 2, or 3, NEMA in single, heavy, or triple, and JIS in class 0, 1, 2, or 3. The tolerances in these standards can be further restricted if necessary to design and optimize the wound coils and final products.

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