Thermal resistivity of armour bedding

Typical values for different materials are listed below.

Values are taken from IEC 60287-2-1 Ed.2.0 with following additions or deviations:

Note: The value is the average of the thermal resistivities of 1st and 2nd armour bedding layer weighted by their thicknesses.

Symbol
$\rho_{ab}$
Unit
K.m/W
Formulae
$\frac{\rho_{ab,1} t_{ab,1}+\rho_{ab,2} t_{ab,2}}{t_{ab}}$
Choices
MaterialValue
PE3.5
PVC5.0 (U_n <= 3kV)
6.0 (U_n > 3kV)
EPR3.5 (U_n <= 3kV)
5.0 (U_n > 3kV)
POC5.0
IIR5.0
NR7.0
PP5.0
SiR5.0
CR5.5
CSM9.1
CJ6.0
RSP6.0
BIT6.0
fPOC6.6
fPP9.0
fPE7.0
fPVC12.0
tape6.0