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Table 53.1
Production-line test conditions
Converter rating Condition A Condition B
Potential, volts Time, seconds Potential, volts Time, seconds
230 volts or less 1000 60 1200 1
53.3 The converter may be in a heated or unheated condition for the test.
53.4 The test shall be conducted when the converter is complete – fully assembled. It is not intended that
the appliance be unwired, modified, or disassembled for the test.
Exception No. 1: Parts such as snap covers or friction-fit knobs that would interfere with performance of
the test need not be in place.
Exception No. 2: The test may be performed before final assembly if the test represents that for the
completed appliance.
53.5 If a converter employs a solid-state component that is not relied upon to reduce a risk of electric
shock and that can be damaged by the dielectric potential, the test may be conducted before the
component is electrically connected provided that a random sampling of each day’s production is tested
at the potential specified in Table 53.1. The circuitry may be rearranged for the purpose of the test to
minimize the likelihood of solid-state-component damage while retaining representative dielectric stress of
the circuit.
53.6 The test equipment shall include a transformer having an essentially sinusoidal adequate output, a
means of indicating the test potential, an audible or visual indicator of electrical breakdown, and either a
manually reset device to restore the equipment after electrical breakdown or an automatic reject feature
of any unacceptable unit.
53.7 If the output of the test equipment transformer is less than 500 volt-amperes, the equipment shall
include a voltmeter in the output circuit to directly indicate the test potential.
53.8 If the output of the test equipment transformer is 500 volt-amperes or larger, the test potential may
be indicated:
a) By an acceptable voltmeter in the primary circuit or in a tertiary-winding circuit,
b) By a selector switch marked to indicate the test potential, or
c) In the case of equipment having a single test-potential output, by a marking in a readily visible
location to indicate the test potential.
When marking is used without an indicating voltmeter, the equipment shall include a positive means, such
as an indicator lamp, to indicate that the manually reset switch has been reset following a dielectric
breakdown.
DECEMBER 14, 1993UL 45872
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