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Effective length per unit lay length of conductor strands

An average lay length factor for all strands in a conductor can be defined, assuming the conductor being build up from strands of uniform dimensions.

If the lay length factor averaged over all strands in the conductor is unknown, a typical value of 1.05 can be used both for copper and aluminium.

Symbol
$F_{lay,c}$

Default
1.0

Formulae
$\sqrt{1+\left(\frac{\pi d_{cw}}{L_{lay,c}}\right)^2}$
Related
$d_{cw}$
Average diameter of conductor wire strand [mm]
$L_{lay,c}$
Length of lay of conductor strands [mm]
$\pi$
Archimedes' constant $\pi$
Used in
$R_{co}$
Standard DC resistance of conductor [$\Omega$/km]