This part of IEC 60317 specifies the requirements of enamelled rectangular copper winding wire of class 120 with a sole coating based on polyvinyl acetal resin, which may be modified providing it retains the chemical identity of the original resin and meets all specified wire requirements.
Class 120 is a thermal class that requires a minimum temperature index of 120 and a heat shock temperature of at least 155℃.
The temperature in degree Celsius corresponding to the temperature index is not necessarily that at which it is recommended that the wire be operated, and this will depend on many factors, including the type of equipment involved.
The range of nominal conductor dimensions covered by this standard is as follows:
Wire of Grade 1 and Grade 2 are included in this specification and apply to the complete range of conductors.
The coating shall show no crack after the wire has been bent flatwise and edgewise on a mandrel with a diameter as specified in the following table.
| Wire Bent On | Mandrel Diameter | |
| Width | Sizes up to and including 10 mm Sizes over 10 mm |
2 × Width 3 × Width |
| Thickness | All Dimensions | 2 × Thickness |
The wire shall be stretched by 20%.
The distance of loss of adhesion shall be less than 1 × Width.
| Name | Enameled Rectangular Wire |
| Conductor | Copper |
| Dimension | Thickness (a): 0.3–10.0 mm Width: 1.0–22 mm We can produce ultra-flat large-size wire. |
| Thermal Class (℃) | 120 (Class E) |
| Insulation Thickness | Single, Heavy |
| Certificate | UL |
| Standard | IEC, NEMA, GB, JIS |
| Packing | 30–150 kg plywood spool (250×400 / 250×500 / 250×600 / 250×730) |
| Application | Transformers, Motors, Generators, Modern Instruments, Welding Machines, etc. |
Electrical Motors
It is employed for motor winding applications due to its excellent electrical insulation properties, high-temperature resistance, and efficient use of space with its rectangular shape.
Transformers
Transformers are vital components in power distribution and electrical systems. The wire's high-temperature rating, electrical insulation properties, and space-efficient design make it suitable for transformer windings.
Coils and Inductors
These components are essential in electronics, telecommunications, and power supply systems. The wire's rectangular shape allows for precise winding and space optimization.
Aerospace and Aviation
Class 120 PVAc enamelled rectangular copper wire is utilized in aerospace and aviation applications where lightweight and reliable electrical conductors are required. It finds use in aircraft electrical systems, avionics, and various onboard components.
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