UL COPYRIGHTED MATERIAL –
NOT AUTHORIZED FOR FURTHER REPRODUCTION OR
DISTRIBUTION WITHOUT PERMISSION FROM UL
6.6 A nonmetallic part (such as a reset knob, a lever, or a button) protruding through a hole in the
enclosure, shall be made of a material classed as V-0, V-1, or V-2 in accordance with the Standard for
Tests for Flammability of Plastic Materials for Parts in Devices and Appliances, UL 94, if the area of the
hole is 0.6 inch
2
(387.1 mm
2
) or less. Nonmetallic parts protruding through a hole having an area larger
than 0.6 inch
2
shall be made of materials that comply with the requirement in 6.4.
Exception No. 1: A part of a component need not be classed V-0, V-1, or V-2 if it complies with the
flammability requirements applicable to the component.
Exception No. 2: A part need not be classed V-0, V-1, or V-2 if, when removed, there are no live parts or
moving parts accessible to the user as determined by the requirements in Section 8, Accessibility of
Uninsulated Live Parts, Film-Coated Wire, and Moving Parts.
6.6 revised September 11, 1998
6.7 A conductive coating applied to a nonmetallic surface (such as the inside surface of a cover or an
enclosure) shall comply with the applicable requirements in the Standard for Polymeric Materials – Use in
Electrical Equipment Evaluations, UL 746C.
Exception: If flaking or peeling of the coating will not result in a risk of fire or electric shock as a result
of a reduction of spacings or the bridging of live parts, then the coating need not comply with UL 746C.
6.7 effective April 13, 1993
6.8 Overtemperature and overcurrent protection shall be located within the converter or inverter
enclosure. See 20.2.1 – 20.2.3.
Exception: The operating handle of a circuit breaker, the operating button of a manually-operable
protector, the capped portion of an extractor-type fuseholder, or a similar part may project outside the
enclosure.
6.8 effective April 13, 1993
6.9 A door or cover of an enclosure shall be hinged or attached in an equivalent manner if it provides
access to an overload-protective device the normal functioning of which requires renewal, or if it is
necessary to open the cover in connection with normal operation of the protective device. A door or cover
providing access to a fuseholder shall be tight-fitting and shall be positively held closed.
6.10 A converter or inverter shall be provided with means for securely mounting the converter or inverter
in its intended operating position. Bolts, screws, or other parts used for mounting the converter or inverter
shall be independent of those used for securing components.
6.10 effective April 13, 1993
6.11 If an electrical instrument, such as a meter, forms part of the enclosure, the face or the back of the
instrument housing, or both together, shall comply with the requirements for an enclosure.
Exception: An electrical instrument connected in a secondary circuit need not comply with this
requirement if damage to or deterioration of the materials of which the housing is made will not result in
a risk of electric shock or fire.
SEPTEMBER 11, 1998UL 45814
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