UL 13:2005 pdf download.Power-Limited Circuit Cables.
7.3 Thicknesses
7.3.1 The dimensions of the spacer (thread) portion of the material insulation in an air-gap coaxial member are not specified. The average thickness and the minimum thickness at any point of the tube portion of an air-gap coaxial member shall not be less than indicated In Table 7.3. The thicknesses of the integral insulation (solid) and jacket on a flat, parallel cable shall not be less than indicated in Table 7.2. The average thickness and the minimum thickness at any point of solid insulation (including any skin) on single-conductor cable for Class 2 circuits and on any conductor in an unjacketed ribbon cable (before and after separation) and in a twisted pair or other twisted multiple-conductor cable that is without an overall jacket and is for Class 2 circuits shall not be less than indicated In Table 7.4, The average thickness and the minimum thickness at any point of solid insulation (Including any skin) in a coaxial member, on a thermocouple-extension wire, and on every other conductor, including each conductor in jacketed ribbon cable before and after separation and in nonintegral flat cable, shall not be less than indicated in Table 7.3. The average thickness and the minimum thickness at any point of solid insulation (including any skin) on conductors In single-conductor and twisted-pair or other twisted multi-conductor Type CL3 cable without an overall jacket shall be not less than indicated in Table 7.5. The thicknesses of foamed insulation (including any skin) shall be evaluated based on the performance of the finished cable when tested in accordance with this Standard. In any case, the thicknesses of solid and foamed insulations (including any skin) are to be determined by means of measurements made as described in Section 250 of UL 1581. with the following modifications for stranded conductors that leave one or more strand impressions in the insulation that are too small to accommodate the smaller pin referred to in 250.11 of UL 1581. which is to be 0.0200 inch (20.0 mils) or 0.508 mm in diameter.
7.3.1 The dimensions of the spacer (thread) portion of the material insulation in an air-gap coaxial member are not specified. The average thickness and the minimum thickness at any point of the tube portion of an air-gap coaxial member shall not be less than indicated In Table 7.3. The thicknesses of the integral insulation (solid) and jacket on a flat, parallel cable shall not be less than indicated in Table 7.2. The average thickness and the minimum thickness at any point of solid insulation (including any skin) on single-conductor cable for Class 2 circuits and on any conductor in an unjacketed ribbon cable (before and after separation) and in a twisted pair or other twisted multiple-conductor cable that is without an overall jacket and is for Class 2 circuits shall not be less than indicated In Table 7.4, The average thickness and the minimum thickness at any point of solid insulation (Including any skin) in a coaxial member, on a thermocouple-extension wire, and on every other conductor, including each conductor in jacketed ribbon cable before and after separation and in nonintegral flat cable, shall not be less than indicated in Table 7.3. The average thickness and the minimum thickness at any point of solid insulation (including any skin) on conductors In single-conductor and twisted-pair or other twisted multi-conductor Type CL3 cable without an overall jacket shall be not less than indicated in Table 7.5. The thicknesses of foamed insulation (including any skin) shall be evaluated based on the performance of the finished cable when tested in accordance with this Standard. In any case, the thicknesses of solid and foamed insulations (including any skin) are to be determined by means of measurements made as described in Section 250 of UL 1581. with the following modifications for stranded conductors that leave one or more strand impressions in the insulation that are too small to accommodate the smaller pin referred to in 250.11 of UL 1581. which is to be 0.0200 inch (20.0 mils) or 0.508 mm in diameter.
