DSH 1048
QuestionThe first sentence of clause 3.4.3.1 of IEC 60384-14 states: ”Capacitors of each technology, rated
voltage, class and sub-class shall be separately qualified”.
If it is requested to qualify a dual-class X/Y capacitor (e.g. X1:400 V, Y2:250V), is it permissible to
perform one type test only by applying for each individual test the highest test severity?
To qualify a dual-class X/Y capacitor, testing laboratories may have different interpretations of this
sentence.
Interpretation a): Some testing laboratories test the same capacitor series once for X1 and once for
Y2 at the same time in separate type tests.
Interpretation b): Other testing laboratories follow the opinion that the safety of the capacitors is also
assured if a mixture of highest testing (peak) voltages of both sub-classes is used. This means worst
case testing, covering both sub-classes for certification.
Both interpretations may possibly lead to the result of compliance or non-compliance of the capacitor,
as in a) more samples are tested and in b) a single capacitor is more stressed.
From the technical point of view, it should be acceptable to perform one type test only by applying the
highest test severity for each test.
Decision
When a range of dual-class capacitors (X/Y) is qualified, it is allowed to perform one type test only, if
the highest severity of the X or Y class is applied in each respective test.
DSH 1048附件
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