UNE-EN IEC 60216-5:2022

This part of IEC 60216 specifies the experimental and calculation procedures to be used for

deriving the relative temperature index of a material from experimental data obtained in

accordance with the instructions of IEC 60216-1 and IEC 60216-2. The calculation procedures

are supplementary to those of IEC 60216-3.

Guidance is also given for assessment of thermal ageing after a single fixed time and

temperature, without extrapolation.

The experimental data may in principle be obtained using destructive, non-destructive or proof

tests, although destructive tests have been much more extensively employed. Data obtained

from non-destructive or proof tests may be censored , in that measurement of times taken to

reach the endpoint may have been terminated at some point after the median time but before

all specimens have reached end-point (see IEC 60216-1).

Guidance is given for preliminary assignment of a thermal class for an electrical insulating

material (EIM), based upon the thermal ageing performance.

The calculation procedures of this standard also apply to the determination of the thermal class

of an electrical insulation system (EIS) when the thermal stress is the prevailing ageing factor.