# Thermal capacitance of conductor (IEC 60853)

The capacitance of the equivalent conductor for multi-core cables is equal to the sum of the capacitances of the conductors plus the capacitanc of that portion of the insulation which is enclosed within the perimeter of the equivalent conductor.

Symbol
$Q_{ct}$
Unit
J/m.K
Formulae
 $1.0 \cdot 10^{-6} A_{c} \sigma_{c}$ Single-core cables $1.0 \cdot 10^{-6} A_{c} \sigma_{c} + 1.0 \cdot 10^{-6} \sigma_{i} \left(- d_{c}^{2} n_{c} + d_{ct}^{2}\right)$ Multi-core cables
Related
$A_{c}$
$d_{c}$
$\sigma_{i}$
Used in
$Q_{A}$
$Q_{tot}$