This test, carried out in accordance with standard
ieC 60068-2-3, checks that the insulation characteristics
of the enclosure, busbars and conductor supports
are not affected after 4 hours' exposure in a steam
chest (40°C at 95% relative humidity).
the insulation used has a tracking current resistance
of at least 400 V, which means it is not very sensitive to
damp (group i and group ii according to ieC 60664-1).
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