Century UL 1086, Manual

Page: 48 / 82

22.3 Film-coated wire is regarded as an uninsulated live part when spacings are being considered.
22.4 The spacings for a motor shall comply with the spacing requirements in the Standard for Electric
Motors, UL 1004.
22.5 At terminal screws and studs to which connection may be made in the field by wire connectors,
eyelets, and the like as described in 11.2.3.2, spacings shall not be less than those specified in Table 22.2
with the connectors, eyelets, and the like in such position that minimum spacings – opposite polarity and
to dead metal – exist.
Table 22.2
Spacings at other than field-wiring terminals
Potential involved, in
volts
Minimum spacings, inch (mm)a
An appliance employing a motor having a
diameter of 7 inches or lessb
An appliance employing a motor having a
diameter of more than 7 inchesb
Over surface Through air Over surface Through air
0 – 125 3/32c 3/32c 1/4d 1/8d
126 – 250 3/32 3/32 1/4d 1/4d
a Metric equivalents of the dimensions in this table are:
Inches Millimeters
1/16 1.6
3/32 2.4
1/8 3.2
1/4 6.4
7 178
b This is the diameter, measured in the plane of the laminations, of the circle circumscribing the stator frame, excluding lugs,
fins, boxes, and the like, used solely for motor mounting, cooling, assembly, or connection.
c For an appliance employing only motors rated 1/3 horsepower or less, these spacings may be not less than 1/16 inch.
d Film-coated wire is considered to be an uninsulated live part. However, a spacing of not less than 3/32 inch over surface and
through air between film-coated wire, rigidly supported and held in place on a coil, and a dead metal part is acceptable.
22.6 An insulating liner or barrier of vulcanized fiber or similar material employed in place of spacings
shall not be less than 1/32 inch (0.8 mm) thick and shall be so located or of such material that it will not
be adversely affected by arcing.
Exception: Fiber not less than 1/64 inch (0.4 mm) thick may be used in conjunction with an air spacing
of not less than 50 percent of the spacing required for air alone.
FEBRUARY 1, 1996 HOUSEHOLD TRASH COMPACTORS - UL 1086 30