Thermal resistivity of backfill material.

The thermal resistivity of the backfill is only relevant for the cables within this backfill area. The heat flow of cables outside of a backfill area is not influenced by the backfill, which also applies for cables in another backfill area.

Symbol
$\rho_{\mathrm{b}}$
Unit
K.m/W
Used in
$T_{\mathrm{4db}}$