Initially, not more than half the prescribed voltage is applied, then it is raised rapidly to the full value.
No flashover or breakdown shall occur during the test.
The high-voltage transformer used for the test must be so designed that, when the output terminals are
short-circuited after the output voltage has been adjusted to the appropriate test voltage, the output
current is at least 200 mA.
The overcurrent relay must not trip when the output current is less than 100 mA.
Care is taken that the r.m.s. value of the test voltage applied is measured within
±
3 %.
Care is taken that the metal foil is so placed that no flashover occurs at the edges or the edges of the
insulation.
For class II construction incorporating both reinforced insulation and double insulation, care is taken that
the voltage applied to the reinforced insulation does not overstress the basic insulation, or the
supplementary insulation.
In cases where basic insulation and supplementary insulation cannot be tested separately, the insulation
provided is subjected to the test voltages specified for reinforced insulation.
When testing insulating coatings, the metal foil may be pressed against the insulation by means of a
sandbag of such a size that the pressure is about 5 kPa (0,5 N/cm
2
). The test may be limited to places
where the insulation is likely to be weak, for example where there are sharp metal edges under the
insulation.
If practicable, insulating linings are tested separately.
For tools with heating elements incorporated, the test voltages specified in IEC 60335-1 apply to the
heating elements only and not to other parts of the tool.
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