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Strand

Stan Zurek, Strand, Encyclopedia-Magnetica.com, {accessed 2021-03-06}

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.

In Litz wire the strands are electrically isolated from each other, for example by a coat of enamel. Typically, the strands in Litz wires are made from readily available enamelled wire.

Stranded wire (non-Litz) under a microscope stranded_wire_magnetica.jpg

S. Zurek, Encyclopedia Magnetica, CC-BY-4.0

Litz wire under a microscope, with visible enamel coating on each strand (click on the image to enlarge) litz_wire_microscope_1_magnetica.jpg

S. Zurek, Encyclopedia Magnetica, CC-BY-4.0

Litz wire (yellow insulation around each individual strand) and stranded wire (blue insulation only around the whole bunch) litz_and_stranded_wires_magnetica.jpg

S. Zurek, Encyclopedia Magnetica, CC-BY-4.0


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Stranded Al and Cu power cables stranded_cables_magnetica.jpg

S. Zurek, Encyclopedia Magnetica, CC-BY-4.0

Stranded Cu cable, 240 mm2 cable_cu_stranded_240mm2_magnetica.jpg

S. Zurek, Encyclopedia Magnetica, CC-BY-4.0

Single-core Al cable, with sheath made with copper strands al_cable_with_sheath.jpg

S. Zurek, Encyclopedia Magnetica, CC-BY-4.0

See also

References

strand.txt · Last modified: 2021/02/28 17:29 by stan_zurek

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