14.3 A screw or other fastening used to mount or support a small, fragile, insulating part shall not be so
tight as to crack or break such a part because of expansion and contraction. Generally, such a part shall
be slightly loose.
14.4 Ordinary vulcanized fiber may be used for an insulating bushing, a washer, a separator, and a
barrier, but not as the sole support for uninsulated live parts where shrinkage, current leakage, or warpage
may introduce a risk of fire, electric shock, or injury to persons. Thermoplastic materials generally are not
considered to be acceptable for the sole support of uninsulated live parts, but may be employed if
investigated and found to be acceptable for the application.
14.5 A small molded part, such as a terminal block, shall have mechanical strength and rigidity necessary
to withstand the stresses of normal service.
15 Acoustical and Thermal Insulation
15.1 Combustible or electrically conductive acoustical and heat-insulating material shall not be located so
as to make contact with an uninsulated live part.
15.2 Mineral-wool thermal insulation shall not contact an uninsulated live part if it contains conductive
impurities such as slag that may introduce a risk of fire, electric shock, or injury to persons.
16 Motors
16.1 A motor shall be acceptable for the application and shall be capable of handling the loads described
in 37.2 without introducing a risk of fire, electric shock, or injury to persons.
16.2 A motor winding shall resist the absorption of moisture and shall be formed and assembled in a
workmanlike manner.
16.3 With reference to the requirement in 16.2, film-coated wire is not required to be additionally treated
to prevent absorption of moisture, but fiber slot liners, cloth coil wrap, and similar moisture-absorptive
materials shall be impregnated or otherwise treated to prevent the absorption of moisture.
16.4 In the application of requirements based on horsepower to a motor not rated in horsepower, use is
to be made of the appropriate table in the National Electrical Code, ANSI/NFPA 70, that gives the
relationships between horsepower and full-load currents for motors. For an appliance incorporating two or
more motors of different sizes, the spacings inside each motor are to be judged on the basis of the size
of that motor, and the spacings elsewhere in the appliance are to be judged on the basis of the size of the
largest motor in the appliance.
FEBRUARY 1, 1996
HOUSEHOLD TRASH COMPACTORS - UL 1086
25
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