This refers to the flexibility and thermal effects i.e temperature of a conductor.

* Class 1: Solid conductor
* Class 2: Stranded conductor intended for fixed installation
* Class 5: Flexible conductor
* Class 6: Very Flexible conductor

Size

The nominal (see below) cross-sectional area for standard conductors including the following:
* Class 2: Minimum number of strands required to make particular conductor size
* Class 5 and 6: Maximum diameter of any component strand of the conductor

Resistance

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