Energy Guide

Page 74 of 104 Report No.: HK2107050725-SR

UL 507

Clause Requirement + Test Result - Remark Verdict

TRF No. UL507A

56.2 An impeller not required to be guarded is to be

placed in an air-circulating oven maintained at

70°C (158°F) for 7 hours. After removal, it is to be

tested as described in Section 56, Unguarded

Impeller Tests; Section 61, Impact Test on Guards;

and Section 70, Drop Test. As a result of the

testing, the impeller shall not break.

N/A

56.3 A motor-driven impeller not required to be guarded

shall be energy absorbent to the extent that a 3.2

mm (1/8 inch) diameter dry hardwood dowel does

not break when thrust into a rotating blade. The fan

is to be fixed in place and energized so that the

impeller rotates at intended speed. The dowel is to

be supported on a stable, stationary flat surface

perpendicular to the plane of rotation. The surface

is to have a straight edge located approximately

9.5 mm (3/8 inch) from the fan blade. The dowel is

then to be suddenly thrust and retained by hand

along an axis perpendicular to the plane of impeller

rotation into the blade. This procedure is to be

repeated at different points on the impeller (blade

and hub) with the impeller rotating at all intended

speeds and from in front of and behind the impeller

in order to include the most severe condition.

N/A

57 Push Back Relief Test P

57.1 With reference to 15.2.4, a cord-connected fan

shall be tested in accordance with 57.2 without

occurrence of any of the following conditions:

a ) Mecharical damage to the supply cord or lead P

b)Exposure of the supply cord or lead to a

temperature higher than that for which it is rated;

c)Reduction of spacings (such as to a metal strain-

relief clamp) below the minimum required values;

d)Damage to internal connections or components. P