This section of IEC 60317 specifies the requirements for tape-wrapped round copper winding wire, classified as Class 240. The insulation consists of one or two layers of aromatic polyimide tape.
Class 240 is a thermal class that demands a temperature index of at least 240°C and a heat shock temperature of at least 260°C.
NOTE: In some countries, such as Canada, Russia, USA, this product is assigned a class 220.
The tape is coated on one or both sides with an appropriate adhesive, for instance, fluorinated ethylene propylene. After wrapping, the tape is heat-sealed to form a continuous and adherent sheath. Specific requirements may be subject to contract.
The temperature in degrees Celsius corresponding to the temperature index is not necessarily the temperature at which the wire is recommended to be used, and this will depend on many factors, including the types of equipment involved.
The range of nominal conductor diameters covered by this standard is:
- 1,600 mm up to and including 5,000 mm.
The nominal conductor diameters are given in table 1.
When referring to winding wire according to this standard, the following information should be provided:
- Diameter of the conductor;
- Grade.
Example: 6031 7-43 IEC 2,000 mm grade A2
