UL COPYRIGHTED MATERIAL –
NOT AUTHORIZED FOR FURTHER REPRODUCTION OR
DISTRIBUTION WITHOUT PERMISSION FROM UL
32.5 A sample of the converter or inverter is to be tested for leakage current starting with the as-received
condition – the as-received condition is to be without prior energization except as may occur as part of
the production-line testing – but with the grounding conductor, if any, open at the attachment plug. The
supply voltage is to be adjusted to 120 volts. The test sequence, with reference to the measuring circuit,
Figure 32.1, is as follows:
a) With switch S1 open, the converter or inverter is to be without load and connected to the
measuring circuit. The leakage current is to be measured using both positions of switch S2 and
with the converter or inverter switching devices in all their normal operating positions.
b) Switch S1 is then to be closed energizing the converter or inverter, and within a period of 5
seconds the leakage current is to be measured using both positions of switch S2 and with the
converter or inverter switching devices in all their normal operating positions.
c) The leakage current is to be monitored until thermal stabilization. Both positions of switch S2
are to be used in making this measurement. Thermal stabilization is considered to be obtained
by operation of the converter or inverter as in the normal temperature test.
32.5 effective April 13, 1993
OCTOBER 15, 2004UL 45848
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