Max. conductor temperature

Values for maximum conductor temperature depending on the insulation material for normal operation, under emergency overload operation (max 8 hours/day and 100 hours/year) and during short-circuit are according to IEC 60840 Ed.4.0 and IEC 62087 Ed.2.0 where available with the following additions:

The IEC 60724 defines the short-circuit temperature limit of PVC at 160$^{\circ}$C for cables with cross-section ≤ 300mm$^2$ and at 140$^{\circ}$C for cables with cross-section > 300mm$^2$

Symbol
$\theta_{cmax}$
Unit
$^{\circ}$C
$\theta_{cmaxeo}$
$\theta_{cmaxsc}$
$\theta_{kf}$
Final temperature [$^{\circ}$C]
Used in
$\Delta \theta_{max}$
$\Delta \theta_{R_{\infty}}$
Choices
MaterialNormal operationEmergency overloadShort-circuit
PE7080130
HDPE8080160
XLPE90130250
XLPEf90130250
PVC7590160
EPR90110250
IIR85110250
PPLP7070130
Mass8095150
Oil8095150
PP8095150
SiR100180225
EVA100140180
ETFE110180230
FEP110210260
PTFE110260305
PFA110260290