Energy Guide

Page 60 of 104 Report No.: HK2107050725-SR
UL 507
Clause Requirement + Test Result - Remark Verdict
TRF No. UL507A
42.2 The resistance shall be determined by any
convenient method. When unacceptable results
are obtained, either a direct or alternating current
equal to the current rating of the maximum-current-
rated branch-circuit overcurrent-protective device
that is employed with the appliance is to be passed
from the equipment grounding terminal or the point
of attachment of the wiring system to the dead
metal part, and the resulting drop in potential is to
be measured between these two points. The
resistance in ohms is determined by dividing the
drop in potential in volts by the current in amperes
passing between the two points.
P
43 Limited Short-Circuit Test P
43.1 A knockout construction as described in the
Exception to 14.2.3 shall maintain its integrity, no
melting or otherwise opening of the knockout
connection, when subjected to the limited short-
circuit test described in 43.2 and 43.3.
P
43.2 Three samples of the enclosure/conduit
construction are to be subjected to the test. The
current is to be as specified in Table 43.1. The test
circuit is to have a power factor of 0.9 – 1.0 and is
to be limited to the current specified in Table 43.1.
The open-circuit voltage of the test circuit is to be
100 – 105 percent of the rated voltage of the
equipment.
P
43.3 The enclosure is to be connected to the circuit
through appropriately sized 6 inch-length of flexible
metal conduit and a ground terminal suitable for
connection of 3/0 AWG copper conductors is to be
installed as close as possible to the internal conduit
locknut. The free ends of each 4 foot-length of 3/0
AWG copper conductor are connected to each the
supply as described in 43.2 through a series
connected nonrenewable fuse that does not open
in less than 12 seconds when carrying twice its
rated current.
P
44 Starting Current Test P
44.1 When operated as described in 44.3, an appliance
shall start and operate normally without:
P
a)Tripping an overload protector provided as part
of the appliance; or
b)Opening the fuse, when connected to a circuit
protected by a fuse as described in 44.2.
N/A