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53.9 Test equipment, other than that described in 53.6 – 53.8 may be used if found acceptable to
accomplish the intended factory control.
53.10 During the test, the primary switch is to be in the on position, both sides of the primary circuit of the
converter are to be connected together and to one terminal of the test equipment, and the second
test-equipment terminal is to be connected to the accessible dead metal.
Exception No. 1: A converter resistive, high-impedance winding, or the like having circuitry not subject to
excessive secondary-voltage build-up in case of electrical breakdown during the test may be tested with
a single-pole primary switch, if used, in the off position, or with only one side of the primary circuit
connected to the test equipment when the primary switch is in the on position, or when a primary switch
is not used.
Exception No. 2: The primary switch is not required to be in the on position if the testing means applies
full test potential between primary wiring and dead metal parts with the switch not in the on position.
54 Grounding Continuity Test
54.1 Each converter that has a power-supply cord having a grounding conductor shall be tested, as a
routine production-line test, to determine that electrical continuity exists between the grounding blade of
the attachment plug and accessible dead metal parts of the appliance that are likely to become energized.
54.2 Only a single test need be conducted if the accessible metal selected is conductively connected by
design to all other accessible metal.
54.3 Any acceptable indicating device – an ohmmeter, a battery-and-buzzer combination, or the like –
may be used to determine whether an appliance complies with the grounding continuity requirement in
54.1.
RATING
55 General
55.1 The input of a converter shall be rated in amperes or watts and volts, and in frequency expressed
in one of the following terms: hertz, Hz, cycles-per-second, cps, cycles/second, or c/s.
55.2 With reference to 55.1, for an appliance having a single voltage rating, such as 115 volts, rather than
being rated for a range of voltages, such as 110 – 115 volts, maximum rated voltage is considered to be
120 volts. For a converter nominally rated 230 volts, maximum rated voltage is considered to be 240 volts.
If the rating is given in terms of a range of voltages, maximum rated voltage is considered to be 120 volts
or 240 volts, minimum.
55.3 The output circuit of a converter shall be rated in amperes and volts.
55.4 If a converter includes an attachment-plug receptacle intended as a general use outlet, the added
load that the receptacle may impose on the converter and its supply connections shall be included in the
electrical rating of the converter.
DECEMBER 14, 1993 UL 458 73
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