Values according to IEC 60287-1-1. Default value is $k_p$ = 1.0 for cases not covered below.

Values for PP are assumed to be identical to PE and for SiR to EPR.

Symbol
$k_{\mathrm{p}}$
Unit
-
Related
$c_{\mathrm{constr}}$
$k_{\mathrm{s}}$
$M_{\mathrm{c}}$
$M_{\mathrm{i}}$
Used in
$x_{\mathrm{p}}$
Choices
Conductor
construction
Conductor
material
Insulation
material
Copper
wire type
Value
2CuPPLP0.8
2CuMass0.8
2CuOil0.8
2Al0.8
3CuPEunidirectional0.37
3CuPEbidirectional0.37
3CuPEinsulated0.2
3CuHDPEunidirectional0.37
3CuHDPEbidirectional0.37
3CuHDPEinsulated0.2
3CuXLPEunidirectional0.37
3CuXLPEbidirectional0.37
3CuXLPEinsulated0.2
3CuXLPEfunidirectional0.37
3CuXLPEfbidirectional0.37
3CuXLPEfinsulated0.2
3CuPVCunidirectional0.37
3CuPVCbidirectional0.37
3CuPVCinsulated0.2
3CuEPRunidirectional0.37
3CuEPRbidirectional0.37
3CuEPRinsulated0.2
3CuIIRunidirectional0.37
3CuIIRbidirectional0.37
3CuIIRinsulated0.2
3CuPPunidirectional0.37
3CuPPbidirectional0.37
3CuPPinsulated0.2
3CuSiRunidirectional0.37
3CuSiRbidirectional0.37
3CuSiRinsulated0.2
3CuPPLP0.37
3CuMass0.37
3CuOil0.37
3Al0.15
4CuPPLP0.8
4CuMass0.8
4CuOil0.8
4Al0.8