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Diameter of mechanical neutral line

The twisting of three cores are assumed to occur at the mechanical neutral line which is the location where a centre circle divides the cores into 2 equal large parts.

Symbol
$D_{lay,3c}$
Unit
mm
Formulas
$1.29D_i$type CC
$1.29D_{scs}$type SC
$1.29D_{shj}$type SS
Related
$D_i$
Diameter over insulation incl. insulation screen [mm]
$D_{scs}$
Diameter over screen serving [mm]
$D_{shj}$
Diameter over sheath jacket [mm]
Used in
$F_{lay,3c}$
Effective length per unit lay length twisted conductors