Energy Guide

Page 58 of 104 Report No.: HK2107050725-SR
UL 507
Clause Requirement + Test Result - Remark Verdict
TRF No. UL507A
41.3 All exposed conductive surfaces are to be tested
for leakage currents. The leakage currents from
these surfaces are to be measured to the grounded
supply conductor individually as well as collectively
where simultaneously accessible. Parts are
considered to be exposed surfaces unless guarded
by an enclosure determined to reduce the risk of
electric shock as defined in 10.1 – 10.3. Surfaces
are considered to be simultaneously accessible
when they can be readily contacted by one or both
hands of a person at the same time. These
measurements do not apply to terminals operating
at voltages that are not considered to involve a risk
of electric shock. When all accessible surfaces are
bonded together and connected to the grounding
conductor of the power-supply cord, the leakage
current can be measured between the grounding
conductor and the grounded supply conductor.
P
41.4 When a polymeric material or conductive surface
other than metal is used for the enclosure or part of
the enclosure, the leakage current is to be
measured using metal foil having an area of 10 by
20 centimeters (3.9 by 7.9 inches) in contact with
the surface. When the surface has an area of less
than 10 by 20 centimeters (3.9 by 7.9 inches), the
metal foil is to be the same size as the surface. The
metal foil is not to remain in place long enough to
affect the temperature of the appliance.
N/A
41.5 The measurement circuit for leakage current is to
be as illustrated in Figure 41.1. The measurement
instrument is defined in (a) – (d). The meter that is
actually used for a measurement need not only
indicate the same numerical value for a particular
measurement as would the defined instrument.
The meter used is not required to have all the
attributes of the defined instrument:
P
a)The meter is to indicate 1.11 times the average
of the full-wave rectified composite waveform of the
voltage across the resistor or current through the
resistor.
P
b)Over a frequency range of 0 – 100 kilohertz, the
measurement circuitry is to have a frequency
response – ratio of indicated to actual value of
current – equal to the ratio of the impedance of a
1500-ohm resistor shunted by a 0.15-microfarad
capacitor to 1500 ohms. At an indication of 0.5
milliampere, the measurement is not to have an
error of more than 5 percent at 60 hertz.
P