Cables in ducts which have been completely filled with a pumpable material having a thermal resistivity not exceeding that of the surrounding soil, either in the dry state or when sealed to preserve the moisture content of the filling material, may be treated as directly buried cables.

Symbol
$M_{\mathrm{d}}$
Unit
-
Related
$\rho_{\mathrm{d}}$
$\sigma_{\mathrm{d}}$
$U_{\mathrm{d}}$
$V_{\mathrm{d}}$
$Y_{\mathrm{d}}$
Choices
IdMaterial name
NoneNone
MetalMetallic
FibreFibre
CemAsbestos cement
PVCPlastic (PVC)
PEPlastic (LDPE/HDPE)
PPPolypropylene (PP)
EarthEarthenware
WPEWater filled plastic (PE)