# Maximal temperature of non-insulation material

Values for maximum temperature of bedding, serving, filler and jacket material for normal operation, under emergency overload operation (max 8 hours/day and 100 hours/year) and during short-circuit are according to definitions in $\theta_{cmax}$ with the following additions:

• Values for short-circuit for PE, HDPE, PVC, polyolefin copolymer (POC) polychloroprene (CR) and chlorosulphonated PE (CSP/CSM) are according to IEC 60724.
• Values for fibruous materials are assumed to be similar to solid materials of the same kind.
• Values for jute and compounded jute (CJ) are limited by the autoignition temperature for jute of 107°C according to tis-gdv.de .
• Values for twisted yarns (TY) are assumed to be similar to jute.
• Values for natural rubber (NR) are assumed to be similar to butyl rubber (IIR).
• Values for water swelling tapes for screen wire bedding and serving have an operating temperature of 80-100°C according to scapa.com , while for the short-circuit temperature an assumption was taken.

Symbol
$\theta_{kmax}$
Unit
°C
Related
$\theta_{cmax}$
$\theta_{kf}$
Choices
PE7080150
fPE7080150
HDPE8080180
PVC7590200
fPVC7590200
POC90110200
fPOC90110200
PP8095150
fPP8095150
SiR180200250
CR7590200
CSM90110200
EPR90110250
IIR85110250
NR85110250
tape80100200
RSP85110200
PRod90130250
PTube90130250
BIT7070130
CJ7070105
Jute7070105
TY7070105