Table 1 – Maximum normal temperature rises Continued
Parts
Temperature rise K
• melamine-formaldehyde; phenol-formaldehyde or phenol-furfural resins
85
(175)
• urea-formaldehyde resin
65
(150)
– Printed circuit boards bonded with epoxy resin
120
– moulding of:
• phenol-formaldehyde with cellulose fillers
85
(175)
• phenol-formaldehyde with mineral fillers
100
(200)
• melamine-formaldehyde
75
(175)
• urea-formaldehyde
65
(150)
– polyester with glass-fibre reinforcement
110
– silicone rubber
145
– polytetrafluoroethylene
265
– pure mica and tightly sintered ceramic material when such materials are
used as supplementary insulation or reinforced insulation
400
– thermoplastic material
5)
–
Wood, in general
6)
65
Outer surface of capacitors
7)
:
– with marking of maximum operating temperature (T)
T-25
– without marking of maximum operating temperature:
• small ceramic capacitors for radio and television interference suppression
50
• capacitors complying with IEC 60384-14 or 14.2 or IEC 60065
50
• other capacitors
7)
20
External enclosure of tools without heating elements except handles held
in normal use
60
Handles, knobs, grips and the like which, in normal use, are continuously
held:
– of metal
30
– of porcelain or vitreous material
40
– of moulded material, rubber or wood
50
Handles, knobs, grips and the like which, in normal use, are held for short
periods only (e.g. switched):
– of metal
35
– of porcelain or vitreous material
45
– of moulded material, rubber or wood
60
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