Century UL 1086 Manual page 16

8
Metal
Die-cast metal
Cast malleable iron
Other cast metal
Uncoated sheet steel
Galvanized sheet steel
Nonferrous sheet metal other than
copper
Copper
6.7 The requirement in 6.6 necessitates that a switch, a relay, a solenoid, or the like, be completely and
individually enclosed except for terminals, unless it can be shown that breakdown of the component would
not result in a risk of fire, or unless there are no openings in the enclosure through which molten metal,
burning insulation, flaming particles, or the like, can fall. See 43.1.1 and 43.1.2. It will also necessitate the
use of a barrier of noncombustible material:
a) Under a motor unless:
1) The structural parts of the motor or of the appliance provide the equivalent of such a
barrier;
2) The protection provided with the motor is such that no burning insulation or molten
material falls to the surface that supports the appliance or into the compacting
compartment when the motor is energized under each of the following fault conditions:
HOUSEHOLD TRASH COMPACTORS - UL 1086
Thickness of metal enclosure
At small, flat unreinforced
surfaces and at surfaces of
a shape or size that
provides adequate
mechanical strength
3/64 (1.2)
1/16 (1.6)
3/32 (2.4)
0.026 (0.66)
0.029 (0.74)
0.036 (0.91)
0.033 (0.84)
i) Open main winding,
ii) Open auxiliary winding,
iii) Starting switch short-circuited, and
iv) Capacitor of a permanent-split-capacitor motor short-circuited and the rotor
locked – the short-circuit is to be applied before the motor is energized; or
Table 6.1
Minimum thickness, inch (mm)
At surfaces to which a
wiring system is to be
connected in the field
–
–
–
0.032
0.034
0.045
0.043
FEBRUARY 1, 1996
At relatively large
unreinforced flat surfaces
5/64
3/32
1/8
(0.81) 0.026
(0.86) 0.029
(1.14) 0.036
(1.09) 0.033
(2.0)
(2.4)
(3.2)
(0.66)
(0.74)
(0.91)
(0.84)