This section of IEC 60317 outlines the requirements for tape-wrapped rectangular copper winding wire classified as Class 240. The insulation consists of one or two layers of aromatic polyimide tape.
Class 240 is a thermal classification that mandates a temperature index of 240 and a heat shock temperature of no less than 260°C.
NOTE: In certain countries, such as Canada, Russia, and the USA, this product is categorized as Class 220.
The tape is coated on one or both sides with an appropriate adhesive, such as fluorinated ethylene propylene. After the wrapping process, the tape is heat-sealed to create a continuous and adherent sheath. Specific requirements may vary based on contractual agreements.
The temperature in degrees Celsius that corresponds to the temperature index is not necessarily the temperature at which the wire is intended to be used, as this will depend on various factors, including the type of equipment involved.
This standard covers a range of nominal conductor dimensions:
- Width: minimum 2.00 mm, maximum 16.00 mm;
- Thickness: minimum 0.80 mm, maximum 5.60 mm.
The specified combinations of width and thickness, along with the width-to-thickness ratio, are detailed in IEC 60317-0-2.
When referencing winding wire according to this standard, the following details should be provided:
- Reference to IEC 60317-44;
- Dimensions of the nominal conductor (width x thickness);
- Grade.
Example: 60317-44 IEC 4.00 mm x 1.00 mm grade A2.
