MIL-STD-681F
5.4.3 Interconnecting wiring on aircraft and guided missiles. The coding of interconnecting wiring on aircraft shall be in accordance with MIL-W-5088, and on guided missiles shall be in accordance with MIL-W-5088. In the event of conflict between the requirements of this standard and those of the referenced specifications, the requirements of the referenced specifications shall govern.
5.4.4 Flat, multiconductor, homogenous cable. When color coding is required, the base colors of table I shall be used, and shall be repeated in sequence for the required number of conductors by using solid colored insulation or striping on all-white insulation.
5.5 System V - Direct wiring and open wiring.
5.5.1 Wire insulation color. White insulation shall be used for all interconnecting wires, unless a particular color is prescribed in the equipment or system specification to identify a definite arrangement of elements, a specific function, or a hazardous condition.
5.5.2 Differentiation markings. Identification, if required, shall be printed in black on the wire insulation, on the white sleeve, or on some other type of marker. Printed markings shall be legible and applied so that the marking function is readily identified.
5.6 System VI - Differential color coding for high density chassis and interconnecting wiring (see 1.2).
5.6.1 Method of color coding. Color coding shall be accomplished by use of solid color insulations, circumferential banding on all-white insulation or numerically marked sleeve or tape markers. Materials or paints used for circumferential banding or numeric marking shall not be electrically conductive.
5.6.2 Circumferential banding.
5.6.2.1 Identification numbers. Identification numbers shall consist of not more than four digits, which may be either in sequential or ascending sequential order, deleting the digit 9 for white.
5.6.2.2 Color sequence of circumferential bands. The circumferential bands shall be parallel to each other, be clearly defined and, within and between repeated color groupings, consistent in width and spacing for the length of the wire, and essentially continuous except that discontinuities may be permitted provided the coded identity can be read by rotating the wire.
a. Band width. The width of the bands shall be measured perpendicular to the centerline of the band. The width of all bands shall be not less than 0.031 inch when the diameter over the marked surface exceeds
0.047 inch; or not less than two-thirds the nominal diameter of the surface when the diameter over the marked surface is 0.047 inch or less.
b. Band spacing. The spacing between bands in a group shall be not less than the individual band width, except that the spacing between the first band in a group of three or four shall be twice the spacing between the bands in the remainder of the group.
c. Spacing between groups of bands. The spacing separating a group of bands from the next grouping shall be greater than the widest spacing between bands within a group, but not exceed 3 inches, and be repeated along the length of the wire.
d. Sequence of reading. The wire number represented by the color banding is read by starting with the band further displaced from the remaining two or three bands.
5.6.3 Wire markers. Numerically marked sleeves, tapes or pressure sensitive tapes may be applied at the ends of the insulated wire or braided covering where wire diameter, cable concentricity or insulation type preclude the application of circumferential bands.
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