Table 8.7 - Temperature correction factors for insulation
Insulation type	Correction factor
-	Bunched or as a cable core	Not bunched or sheathed cable
p.v.c.	1.20	1.04
85°C rubber	1.26	1.04
90°C thermosetting	1.28	1.04

Extracted from The Electricians Guide Fifth Edition
by John Whitfield
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