Reciprocal of temperature coefficient of resistance

Reciprocal of temperature coefficient of resistance of the current carrying component at 0$^{\circ}$C

Symbol
$\beta_{k}$
Unit
K
Formulae
$\beta_{c}$conductor
$\beta_{sc}$screen
$\beta_{sh}$sheath
$\beta_{ar}$armour
$K_{k}$
$\theta_{kf}$
Final temperature [$^{\circ}$C]