Cableizer ®

Circumference armour

The equation for duplex/triplex and pipe-type cables is according to CIGRE TB 880 Guidance Point 41.

Symbol
$S_{ar}$
Unit
mm
Formulas
$n_c D_{core}+\left(D_{core}+2t_{ab}+t_{a,1}+t_{a,2}\right) \pi$multi-core cables without filler (duplex/triplex), pipe-type cables
$\left(D_{ab}+t_{a,1}+t_{a,2}\right) \pi$otherwise
Related
$D_{ab}$
Diameter over armour bedding [mm]
$D_{core}$
Diameter over core cable [mm]
$n_c$
Number of conductors cable
$\pi$
Archimedes' constant $\pi$
$t_{a,1}$
Thickness armour 1 [mm]
$t_{a,2}$
Thickness armour 2 [mm]
$t_{ab}$
Thickness armour bedding [mm]
Used in
$d_{ar}$
Mean diameter armour [mm]
$F_{lay,ar}$
Effective length per unit lay length armour
Image

CIGRE TB 880 Guidance Point 41