Strand - a single thinner wire in the bunch of many such wires, forming a stranded wire (multi-strand wire), with an overall larger cross-sectional area. 1) Very fine strands can also be referred to as filaments, especially in superconducting cables.2)
Strands are used for improving mechanical flexibility of stranded wire, the thinner the strand the more flexible the whole wire.
In an ordinary stranded wire, the strands are made from bare copper, so the strands are electrically connected to each other throughout the length of the wire.
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