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Separation of conductors in a system

In multi-core cables, the axial separation depends on the sreen and sheath construction.

In arrangements with single-core cables, the axial separation is the shortest distance between the center of two phases.

Symbol
$s_c$
Unit
mm
Formulas
$\frac{D_{is}}{F_x}$multi-core cables, sector-shaped conductors
$D_i$multi-core cables, common screen/sheath
$D_i+2\left(t_{scb}+t_{sc}+t_{scs}\right)$multi-core cables, separate screen and common sheath
$D_{sh}$multi-core cables, separate screen/sheaths
$D_{shj}$multi-core cables, jacket around each core
Related
$a_{12}$
Distance phase 1 — phase 2 [mm]
$a_{23}$
Distance phase 2 — phase 3 [mm]
$a_{31}$
Distance phase 3 — phase 1 [mm]
$D_i$
Diameter over insulation incl. insulation screen [mm]
$D_{is}$
Diameter over insulation screen [mm]
$D_{sh}$
Diameter over sheath [mm]
$D_{shj}$
Diameter over sheath jacket [mm]
$F_x$
Geometrical distance factor for multi-core cables
$t_{sc}$
Thickness screen [mm]
$t_{scb}$
Thickness screen bedding [mm]
$t_{scs}$
Thickness screen serving [mm]
Used in
$a_m$
Mean distance between the phases [mm]
$c_c$
Distance axis of conductor—cable center [mm]
$\Delta_1$
Substitution coefficient $\Delta_1$ for eddy-currents
$\Delta_2$
Substitution coefficient $\Delta_2$ for eddy-currents
$GMR_{cc}$
Geometric mean radius conductor bundle [mm]
$\lambda_0$
Substitution coefficient $\lambda_0$ for eddy-currents
$\lambda_{21}$
Loss factor armour, circulating currents
$\lambda_{22}$
Loss factor shield, eddy currents
$\lambda_3$
Loss factor steel pipe pipe-type cable
$\lambda_4$
Loss factor magnetic duct
$S_m$
Separation of conductors in a system [m]
$X_{ar}$
Self reactance armour [$\Omega$/m]
$X_e$
Self reactance screen/sheath [$\Omega$/m]
$X_{S1}$
Reactance section 1 [$\Omega$/m]
$X_{S2}$
Reactance section 2 [$\Omega$/m]
$X_{S3}$
Reactance section 3 [$\Omega$/m]
$y_p$
Proximity effect factor conductor