What is the difference beween a fine-stranded conductor and a solid, stranded conductor?

According to DIN VDE 0295 / IEC 60228 we distinguish mainly four different conductor classes:

Conductor, solid, Class 1
Made of a single, solid wire, usually copper, which is insulated by a plastic insulation layer. A set of 2 or more conductors form a sheathed multicore cable. Used e. g. in building installation and other surroundings, where a strong and compara- tively rigid cable construction is required.

Conductor, stranded, Class 2
Used for fixed installation purposes, it consists of a number of thinner wires, which are stranded to a string, which is more flexible than a solid conductor.

Conductor, flexible, Class 5
Assembled from a greater number of individual, finer wires, the conductor respectively the final cable are used, whereever the cable needs to be much more flexible, but also a good stability is needed, e. g. to connect fixed equipment like ma- chines, larger household equipment etc to mains.

Conductor, very flexible, Class 6
Built from still finer wires, this conductor type is being used for cables, installed at all movable electrical equipment, e. g. from TV to hair blowers.

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