MIL-DTL-27500H
3.4 Identification of cable wire. The basic wire insulation for single or multiconductor cables shall be colored to provide a
method of determining the wire number. Unless otherwise specified (see 6.2), the preferred identification method (see 3.4.1) shall
be used. Stripes, tracers and background insulation colors on the basic wires shall meet the requirements of MIL-STD-104 Class I,
unless otherwise indicated or allowed by the basic wire specification
3.4.1 Preferred identification method. The insulation of wire used in the cable shall be white (or basic color or natural color)
with one or two colored spiral stripes in accordance with table III A or III B, as applicable. The color stripe (s) may be applied by an
inking process or be incorporated in the textile braid when the braid is employed in the basic wire. When the inking process is
used, the stripe (s) shall be in accordance with MIL-STD-681 except the stripe color and sequence shall be as specified herein.
When the braid is used, colored fibers shall be used for two parallel and adjacent carriers of the braid. The color identification fibers
shall be woven in the opposite direction of any identification marker.
3.4.2 Optional identification, method A. The insulation shall be solid color in accordance with table III A or III B, as
applicable. Solid coloring shall be done by the manufacturer of the wire and the coloring shall meet the requirements of the basic
wire specification.
3.4.3 Optional identification, method B. The insulation on each wire in the cable shall be the same solid color . The color shall
denote wire size in accordance with table III C. In order to identify each wire in the cable, color bands shall be applied in
accordance with table III D. Color of the bands shall be a contrasting color to the base color of the insulation. The narrow bands
shall be 0.030 inch to 0.120 inch (0.76 to 3.05 mm) wide, the wide bands shall be twice the width of the narrow bands, and spaced
0.030 inch to 0.120 inch apart in a group. Group separation shall be 0.38 to 1.50 inch (9.7 to 38.1 mm). The distance between the
beginning of one group and the end of the next group shall be 3.0 inches (76.2 mm) maximum.
3.9.4 Optional identification, method C. The insulation on each wire in the cable shall be the same solid color. The color shall
denote wire size in accordance with table III C. In order to identify each wire in the cable, the use of numbers imprinted on the
insulation of the primary wire shall be permitted. The color of the numbers shall be a contrasting color to the base color of the
insulation. The distance between the printed numbers shall be 3.0 inches (76.2 mm) maximum
3.4.5 Optional identification, method D. The insulation on each wire in the cable shall be white or natural. In order to identify
each wire in the cable, the use of numbers imprinted on the insulation of the primary wire shall be permitted. The color of the
numbers shall be a contrasting color to the base color of the insulation. The distance between the printed numbers shall be 3.0
inches (76.2 mm) maximum
3.5 Cable lay-up. The required number of wires for multiconductor construction determined by the cable designation shall be
cabled with a left-hand lay. The lay of the individual wires shall be not less than 6 nor more than 16 times the outside maximum
diameter of the unshielded, unjacketed cable as calculated in 4.4. The basic wire shall not be spliced. When cables are cut, wires
shall not splay more than twice the diameter of the cable.
3.6 Fillers and binder tapes. Fillers and binder tapes, if used shall be of a fungus resistant material with a temperature
equivalent to the cable rating with out fillers and tape. They shall also be easily removable from the finished cable without
adherence to the underlying insulation.
3.7 Shield. When the cable designation specifies that a shield is to be incorporated in the cable construction, either a closely
woven braid using round strand or a closely woven braid of flat strand shall be applied over the basic wire or cable. The shield
strands shall be free from lumps, kinks, abrasions, scraped or corroded surfaces and skin impurities. The strand coating shall be
smooth, continuous, and adherent to the underlying material.
3.7.1 Braided shields.
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