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15.6 Barriers
15.6.1 A barrier used to separate or segregate internal wiring shall have adequate mechanical strength,
and shall be reliably held in place.
15.6.2 A barrier of metal shall be at least as thick as specified in 6.3. A barrier of insulating material shall
not be less than 0.028 inch (0.71 mm) thick and shall be supported so that it cannot be readily deformed
to defeat its purpose.
15.6.3 A barrier used to provide separation between field wiring of one circuit and wiring or uninsulated
live parts of another circuit shall be spaced not more than 1/16 inch (1.6 mm) from the enclosure walls
and interior mechanisms, component-mounting panels, and other parts that serve to provide segregated
compartments.
15.6.4 With reference to 15.6.3, a hole provided for routing leads from a component compartment into a
field-wiring compartment shall have smooth rounded edges or be provided with an insulating bushing. The
size of the hole shall not be greater than necessary for passage of the conductors.
OCTOBER 15, 2004 UL 458 30A
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