====== Strand ======

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| //[[user/Stan Zurek]], Strand, Encyclopedia Magnetica//, \\ @PAGEL@  |


**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]]. [(Perry>[[https://books.google.co.uk/books?isbn=0824774531|Michael P. Perry, Low frequency electromagnetic design, Marcel Dekker Inc, New York, 1985, ISBN 0824774531]])] Very fine strands can also be referred to as **filaments**, especially in [[superconductor|superconducting]] cables.[(CERN>[[https://cds.cern.ch/record/969673?ln=en|CERN, Sample of superconducting wire]], {accessed 2020-11-09})]

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]].

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[[Stranded wire]] (non-Litz) under a microscope 
[[file/stranded_wire_magnetica_jpg|{{stranded_wire_magnetica.jpg}}]]
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[[Litz wire]] under a microscope, with visible enamel coating on each strand (click on the image to enlarge)
[[file/litz_wire_microscope_1_magnetica_jpg|{{litz_wire_microscope_1_magnetica.jpg}}]]
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Litz wire (yellow insulation around each individual strand) and stranded wire (blue insulation only around the whole bunch) 
[[file/litz_and_stranded_wires_magnetica_jpg|{{litz_and_stranded_wires_magnetica.jpg}}]]
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Stranded Al and Cu power cables 
[[file/stranded_cables_magnetica_jpg|{{stranded_cables_magnetica.jpg}}]]
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Stranded Cu cable, 240 mm<sup>2</sup>, strand diameter 0.4 mm, 1910 strands 
[[file/cable_cu_stranded_240mm2_magnetica_jpg|{{cable_cu_stranded_240mm2_magnetica.jpg}}]]
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Single-core Al cable, with sheath made with copper strands
[[file/al_cable_with_sheath_jpg|{{al_cable_with_sheath.jpg}}]]
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===== See also =====
  *[[Stranded wire]]
  *[[Enamelled wire]]
  *[[Litz wire]]

===== References =====
~~REFNOTES~~

{{tag> Strand Stranded_wire Enamelled_wire Litz_wire Magnet_wire Counter}}


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