Continuity Test Of Grounding Circuit - Century UL 1086 Manual

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33.6 Unless the meter is being used to measure leakage from one part of an appliance to another, the
meter is to be connected between the accessible parts and the grounded supply conductor.
33.7 A sample of the appliance is to be tested for leakage current starting with the as received condition
– as received being without prior energization except as may occur as part of the production-line testing
– but with the grounding conductor open at the attachment plug. The supply voltage is to be adjusted to
the voltage specified in 32.1. The test sequence, with reference to the measuring circuit– Figure 33.1 – is
to be as follows:
a) With switch S1 open, the appliance is to be connected to the measuring circuit. Leakage
current is to be measured using both positions of switch S2, and with the appliance switching
devices in all their operating positions.
b) Switch S1 is then to be closed energizing the appliance, and within 5 seconds, the leakage
current is to be measured using both positions of switch S2, and with the appliance switching
devices in all their operating positions.
c) The leakage current is to be monitored until thermal stabilization. Both positions of switch S2
are to be used in determining this measurement. Thermal stabilization is to be obtained by
operation as in the normal temperature test.
33.8 Normally the complete leakage current test program as described in 33.7, is to be conducted without
interruption for other tests. With the concurrence of those concerned, the leakage current test may be
interrupted for the purpose of conducting other nondestructive tests.

34 Continuity Test of Grounding Circuit

34.1 The resistance between the point of connection of the equipment-grounding means, at or within the
appliance, and any point in the grounding circuit shall not be more than 0.1 ohm.
34.2 With reference to 34.1, the resistance may be determined by any convenient method. However, if
unacceptable results are obtained, an alternating current of at least 20 amperes from a source of supply
of not more than 12 volts is to be passed from the point of connection of the equipment-grounding means
to the metal part in the grounding circuit, and the resulting drop in potential is to be measured between
these two points. The resistance in ohms is to be determined by dividing the drop in potential in volts by
the current in amperes passing between the two points. The grounding conductor of a power-supply cord
is not to be included in this measurement.
HOUSEHOLD TRASH COMPACTORS - UL 1086 JANUARY 6, 2004