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Specific electrical resistivity of armour material

Values for specific electrical resistivity of sheath material at 20°C. are taken from standard IEC 60287-1-1 Ed.2.1 where available and from standard technical handbooks for the others. The standard provides a different value of aluminium conductor and sheaths and armour.

Symbol
$\rho_{ar}$
Unit
$\Omega$.m
Formulae
$\rho_{ar} \frac{\pi \left(\left(\frac{D_{ar}}{2}\right)^2-\left(\frac{D_{ab}}{2}\right)^2\right)}{A_{ar}}$
Related
$A_{ar}$
Cross-sectional area of armour [mm$^2$]
$a_{type}$
Construction of armour
$D_{ab}$
Diameter over armour bedding [mm]
$D_{ar}$
External diameter of armour [mm]
$M_{ar}$
Material of armour
$\pi$
Archimedes' constant $\pi$
Used in
$m_{z,ar}$
Parameter m of armour
$R_{ar}$
Electrical resistance of armour [$\Omega$/m]
$\mathscr{z}_{pin}$
Impedance of armour inner surface [$\Omega$/m]
$\mathscr{z}_{pmut}$
Mutual impedance of armour [$\Omega$/m]
$\mathscr{z}_{pout}$
Impedance of armour outer surface [$\Omega$/m]
Choices
MaterialValueReference
Cu1.7241e-08IEC 60287-2-1
Al2.84e-08IEC 60287-2-1
Brz3.5e-08
CuZn3.9e-08
S1.38e-07
SS7e-07