MIL-DTL-442G
TABLE I. Physical and electrical characteristics.
Overall max. dia. of
Area,
Strand diameter
1/
Conductor
Cable
No. of strands
cross-section, inch (mm)
circular mils
Inch (mm)
AWG
types
(minimum)
(nominal)
(nominal)
Width
Height
20
1020
Solid
.032 (.81)
.188 (4.78) .094 (2.39)
I
18
1620
Solid
.040 (1.02)
.204 (5.18) .102 (2.59)
22
640
16
.0063 (.16)
.188 (4.78)
.094 (2.39)
II
20
1020
26
.0063 (.16)
.219 (5.56)
.109 (2.77)
18
1620
41
.0063 (.16)
.109 (2.77)
.219 (5.56)
III
18
1620
41
.0063 (.16)
.219 (5.56)
.109 (2.77)
1/ See 6.2
3.2 Material.
3.2.1 Conductor.
3.2.1.1 Types I and II. Type I and II conductors shall be drawn and annealed copper wire material
with no coating, conforming to A-A-59551. When specified (see 6.2 and 6.8), type II conductors shall be
coated with a tin lead alloy (2 to 3 % minimum).
3.2.1.1.1 Pure tin. The use of pure tin, as an underplate or final finish, is prohibited both internally
and externally. Tin content of cable wire and solder shall not exceed 97 percent, by mass. Tin shall be
alloyed with a minimum of 3 percent lead, by mass (see 6.8).
3.2.1.2 Type III. Type III conductor shall be composed of high tensile copper alloy (nominal
composition of 99% copper and 1% cadmium) strands so as to meet the breaking strength and electrical
requirements specified herein.
3.2.1.2.1 Resistance (type III). The maximum conductor dc resistance at 20 °C for type III conductor
shall be 10 ohms/1,000 feet.
3.2.2 Size. Each conductor shall consist of one or an assembly of strands, and the conductor size
and thickness of insulation surrounding each conductor shall be as specified in 1.2 and 3.3, respectively.
3.2.3 Joints. Joints in a solid conductor or in any of the individual wires of a stranded conductor shall
be so constructed and disposed throughout the conductor that the diameter, configuration, conductor
resistance, flexibility, and mechanical strength of the complete conductor are not adversely affected.
3.2.4 Separator. A separator shall be provided between the conductor and insulation for class 2 and
3 cables. The separator shall consist of dry, soft, fungus- resistant cotton braid and so applied that the
separator shall cover the conductor completely. The separator on one conductor shall be colored white
and the separator on the other conductor shall be black. When tin coated copper conductors are
specified, the separator may be omitted.
3.2.5 Breaking strength (type III). The type III finished cable shall withstand 175 pounds in tension
without rupture of the insulation or either conductor.
3.2.6 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or
environmentally preferable materials should be used to the maximum extent possible, provided that the
material meets or exceeds the operational and maintenance requirements, and promotes economically
advantageous life cycle costs.
4
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