Energy Guide

Page 62 of 104 Report No.: HK2107050725-SR
UL 507
Clause Requirement + Test Result - Remark Verdict
TRF No. UL507A
46.1.2 A thermal protective device shall not operate
during the temperature test. See 24.4.
P
46.1.3 Coil and winding temperatures are to be measured
by the change-in-resistance method or by a
minimum of four thermocouples located on
exposed surfaces of the coil windings, except the
change-in- resistance method is to be used for a
coil that is inaccessible for mounting of
thermocouples, such as a coil:
P
a)Immersed in sealing compound; N/A
b)Wrapped with more than two layers of material
such as cotton, paper, or rayon having a total
thickness of more than 0.8 mm (1/32 inch).
P
46.1.4 Thermocouples are to consist of wires not larger
than 24 AWG. When thermocouples are used in
the determination of temperatures in connection
with the heating of electrical devices, it is common
practice to employ thermocouples consisting of 30
AWG iron and constantan wires and a
potentiometer- type indicating instrument; and such
equipment is to be used whenever referee
temperature measurements by thermocouples are
necessary.
P
46.1.5 When the change-in-resistance method is used,
determination of the temperature rise of a winding
is to be calculated by the following formula:
N/A
46.1.6 When necessary, the value of R at shutdown is to
be determined by taking several resistance
measurements at short intervals, beginning as
quickly as possible after shutdown. A curve of the
resistance values and the time is to be plotted and
extrapolated to give the value of R at shutdown.
P
46.1.7 The temperatures specified in Table 46.1 are
based on an assumed ambient temperature of
25°C (77°F). However, tests are to be conducted at
any ambient temperature within the range of 10 –
40°C (50– 104°F).
P
46.1.8 If the temperature test is conducted at an ambient
other than 25° C (77° F), an observed temperature
is to be corrected as described in 46.1.9.
N/A