UL 758:2010 pdf download

6 Optical Fiber Member(s)

6.1 A cable is not prohibited from being composed entirely of optical-fiber members or a combination ofelectrical conductors and optical-fiber members. Optical-fiber members in a cable shall be cabled alone oras a group with the same direction and with the same length of lay as the electrical conductors. In theperformance of a current-carrying cable,each optical-fiber member is to be evaluated as a filler. A groupof optical-fiber members without any electrical conductor(s) that includes one or more non-current-carryingmetal parts such as metal strength elements or metal vapor barriers may be used in a group ofoptical-fiber members without any electrical conductor(s). The construction of these parts is not specified.Each such part shall be physically and electrically isolated from any bare grounding conductor in the cableand shall be earth-grounded when the cable is installed.

7 Insulation

7.1 General

7.1.1 A conductor shall be insulated for its entire length.The insulation shall:

a) Be applied directly to the surface of the conductor or to any separator;
b) Cover the conductor or any separator completely ; and

c) Not have any defects that are visible with normal or corrected vision without magnification.

The insulation may be applied simultaneously in more than one colorlayer provided that all ayers are notseparable and are of the same base compound(differ only in color). The thickness of each individual layeris not specified.