Energy Guide

Page 10 of 104 Report No.: HK2107050725-SR
UL 507
Clause Requirement + Test Result - Remark Verdict
TRF No. UL507A
9.1.4
An impeller shall be secured to the shaft, with
consideration given to such factors as the size
and weight of the impeller, motor power, mounted
position, thrust direction, and the risk of injury to
persons if breakage occurs. A reversible fan shall
not rely solely on friction between the impeller and
a nut turned onto a threaded shaft.
P
9.2 Portable fans and window fans N/A
9.2.1
Other than as described in 9.2.2, a moving part
that causes a risk of injury to persons shall be
guarded or enclosed.
N/A
9.2.2
A moving part such as a rotating grille, rotating air
deflector driven by an airstream, or an impeller is
not required to be guarded when the moving part
complies with all of the following applicable
requirements:
N/A
a)When motor driven, the impeller:
N/A
b)When driven by an airstream, the moving part:
N/A
c)The moving part:
N/A
d)The output power of the motor driving the part is
not more than 35 watts (0.047 horsepower).
N/A
e)The "K" factor of the moving part determined as
specified in 9.2.5 is less than 732.
N/A
9.2.3
An unguarded impeller that complies with
Exception No. 1 to 9.2.2 shall produce an impact
force of 175 N (39.34 pounds) or less.
N/A
9.2.4 Factors to be considered when judging whether a
moving part or a portion of a part is likely to cause
a risk of injury to persons shall include, but are not
limited to:
N/A
a)The portion of the blade being contacted – trailing
edge, leading edge, or periphery;
N/A
b)The blade material and angle, and type and
sharpness of exposed edge; and
N/A
c)The energy available.
N/A
9.2.5
Conventional designs of impellers meet the
requirement of being guarded when:
N/A
a)The relationship between mass (W) in kg,
radius (r) in mm, and speed (N) in revolutions per
minute is such that K in the following equation is
less than 29264:
N/A