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

$M_j$

Jacket material

$\theta_{cmax}$

Max. temperature conductor [°C]

$\theta_{kf}$

Final temperature [°C]

Choices

Material	normal operation	emergency overload	short-circuit
PE	70	80	150
fPE	70	80	150
HDPE	80	80	180
PVC	75	90	200
fPVC	75	90	200
POC	90	110	200
fPOC	90	110	200
PP	80	95	150
fPP	80	95	150
SiR	180	200	250
CR	75	90	200
CSM	90	110	200
EPR	90	110	250
IIR	85	110	250
NR	85	110	250
tape	80	100	200
RSP	85	110	200
PRod	90	130	250
PTube	90	130	250
BIT	70	70	130
CJ	70	70	105
Jute	70	70	105
TY	70	70	105

Maximal temperature of non-insulation material

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