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Stranded wire

Stan Zurek, Stranded wire, Encyclopedia Magnetica, E-Magnetica.pl

Stranded wire - a type of wire which is made from a bunch of many strands (thinner wires), twisted together to make an overall larger effective cross-sectional area.1) Very fine strands can also be referred to as filaments, especially in superconducting stranded 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 or aluminium, 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
Litz wire under a microscope, with visible enamel coating on each strand (click on the image to enlarge) litz_wire_microscope_1_magnetica.jpg
Litz wire (yellow insulation around each individual strand) and stranded wire (blue insulation only around the whole bunch) litz_and_stranded_wires_magnetica.jpg
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Stranded Al and Cu power cables stranded_cables_magnetica.jpg
Stranded Cu cable, 240 mm2 cable_cu_stranded_240mm2_magnetica.jpg
Single-core Al cable, with sheath made with copper strands al_cable_with_sheath.jpg

See also

References

stranded_wire.txt ยท Last modified: 2021/04/17 14:53 by stan_zurek

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