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Specific electrical resistivity of screen material

Values for specific electrical resistivity of screen 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. We use the same value for screen as for sheath.

Value for Aldrey (AL3) is taken from EN 50183, the value given by a manufacturer was 3.33e-8.

Symbol
$\rho_{sc}$
Unit
$\Omega$.m
Formulae
$\rho_{sc} \frac{\pi \left(\left(\frac{D_{sc}}{2}\right)^2-\left(\frac{D_{scb}}{2}\right)^2\right)}{A_{sc}}$
Related
$A_{sc}$
Cross-sectional area of screen [mm$^2$]
$D_{sc}$
Diameter over screen [mm]
$D_{scb}$
Diameter over screen bedding [mm]
$M_{sc}$
Material of screen
$\pi$
Archimedes' constant $\pi$
Used in
$m_{z,sc}$
Parameter m of screen
$R_{sc}$
Electrical resistance of screen [$\Omega$/m]
$\rho_s$
Specific electrical resistivity of shield [$\Omega$.m]
$\mathscr{z}_{3,sc}$
Impedance of screen inner surface [$\Omega$/m]
$\mathscr{z}_{4,sc}$
Mutual impedance of screen [$\Omega$/m]
$\mathscr{z}_{5,sc}$
Impedance of screen outer surface [$\Omega$/m]
Choices
MaterialValueReference
Cu1.7241e-08IEC 60287-1-1
Al2.84e-08IEC 60287-1-1
AL33.253e-08Manufacturer
Brz3.5e-08IEC 60287-1-1
CuZn3.9e-07IEC 60287-1-1
S1.38e-07IEC 60287-1-1
SS7e-07IEC 60287-1-1
Zn6.11e-08engineeringtoolbox.com