MIL-DTL-3432J
1.2.1.5.2 Unshielded grouped conductors. Conductors twisted together to form a group (such as pairs, triples,
quads, etc.) are designated, immediately following the wire size, by "x" followed by the number of these conductor
groups contained in the cable. For example, "2/20 x 1" indicates 2 number 20 AWG conductors twisted together to
form a pair; "3/22 x 4" indicates four groups, each group consisting of 3 number 22 AWG conductors twisted together
to form a triple.
1.2.1.5.3 Shielding.
1.2.1.5.3.1 Grouped shielding. When one or more groups of copper conductors have a common shield over each
conductor group, the designator "S x (number of groups)" follows the wire size; for example, "2/22 S x 6" indicates six
pairs of number 22 AWG conductors, with a shield over each pair. When a single group has an overall shield, the
designation "x 1" is to be omitted since conductors under a shield are twisted to form one group, for example; "2/20
S" indicates one twisted pair of number 20 AWG conductors under a common shield.
1.2.1.5.3.2 Individual shielding. When each conductor of the same size is individually shielded, the letter "I"
follows the letter "S". For example: "3/14 SI indicates 3 number 14 AWG conductors, each conductor individually
shielded. A shielded single conductor is to be designated by the letter "S" instead of "SI". For example: "1/18 S"
indicates 1 number 18 AWG conductor shielded.
1.2.1.5.4 Uninsulated ground drain wires. Uninsulated ground drain wires are designated in the same manner as
conductors specified in 1.2.1.5 except the letter "R" is to follow the wire size. For example: "3/8 R" indicates 3 number
8 AWG ground wires. Uninsulated ground wires are not counted in the total number of conductors.
1.2.1.5.5 Cabling. All conductors and groups that are cabled together beneath the jacket, and under the jacket
shield, should be enclosed in parentheses. For example: "(2/20 x 2 - 3/18)" indicates a cable made up of two twisted
pairs of number 20 AWG conductors and 3 number 18 AWG conductors.
1.2.1.5.6 Cable configuration. Cables composed of two conductors laid parallel are to be designated by the letter
"F", which is to follow the conductor number. For example, "2F/8" indicates 2 number 8 AWG conductors laid
parallel.
1.2.1.6 Shielding under the jacket. When single shielding is over all conductors and beneath the jacket, the letters
"SJ" follows the parentheses that enclose the conductor data. When double shielding beneath the jacket is specified,
the letters "SSJ" will follow the parentheses that enclose the conductor data. No letters are used if an overall shield
beneath the jacket is not present.
1.2.1.7 Outside diameter.
1.2.1.7.1 Cables (except parallel conductors). The outside diameter of the cable is indicated by four significant
figures expressing the diameter in mils (thousandths of an inch) to the nearest figure divisible by five. If a tolerance
other than that specified in 3.2.8.1 is required, it is indicated by placing the tolerance immediately after this element of
type designation (see 1.2.1.8b and 1.2.1.8f).
1.2.1.7.2 Parallel conductor cables. The outside diameter of the parallel conductor cable should be designated by
giving the major diameter followed by a slant, followed by the minor diameter. The diameter, either major or minor,
should be indicated in mils (thousandths of an inch) by four significant figures. If a tolerance other than that specified
in 3.2.8.2 is required, it should be indicated by placing the tolerance immediately after the major or minor diameter.
1.2.1.8 Use and examples of type designations. Use of type designations formed as indicated in 1.2.1 is not
intended to limit the number of cable types procured under this specification. Representative examples of type
designations are as follows:
a.
M3432 - 10LGF(6/22-2/20-2/18x1)0640 represents a 10 conductor, light duty, general purpose, flexible
cable with 6 number 22 AWG conductors, 2 number 20 AWG conductors, and one twisted pair number 18
AWG conductor. The cable has an outside diameter of .640 inch (16.3 mm).
b. M3432 - 18HLF(3/20x4-3/18x1-3/16)1040 ±.025 represents an 18 AWG conductor, heavy duty, heat
resistant, flexible cable with four triples, each triple composed of 3 number 20 AWG conductors twisted
together; one triple composed of 3 number 18 AWG conductors twisted together; and 3 number 16 AWG
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