MIL-DTL-3702F
3.3.4 Insulation. Insulation shall be applied over the entire cable length, concentric with the
conductor. The insulation shall form a close fit over the conductor without adherence, and when
stripped, it shall leave the conductor clean and in condition for soldering. Elastomeric insulation
shall be seamless and free of foreign material. Semi-rigid insulation shall be free of foreign
material.
3.3.4.1 Wall thickness ratios. The wall thickness of the insulation (at any specific cross-
section) in relation to the conductor, as calculated by the following equation shall be not greater
than 12 percent:
(X - Y )100
Thickness ratio, (percent) =
X +Y
where:
X = maximum wall thickness, in inches
Y = minimum wall thickness, in inches
3.3.5 Sheath. A sheath shall be extruded over the braid. The sheath shall have a thickness
of not less than 0.018 inch (.46 mm) when formed from an elastomeric material, and a thickness of
not less than 0.006 inch (.15 mm) when formed from a semi-rigid material.
3.3.6 Shielding. Shielding for shielded cable shall consist of a close and uniform woven
wire applied directly over the sheath. Each carrier shall have not less than five AWG 34
wires.
3.3.6.1 Splices. Spliced wires shall average not more than one splice per 10 feet of
cable.
3.3.6.2 Coverage. The shielding shall provide not less than 85 percent coverage of the
underlying sheath. Percent of coverage shall be calculated using equation the following
equation:
Coverage (percent) = (2F F²) x 100
where:
ND
F
=
P (Cos angle of advance)
N
=
Number of parallel strands between successive turns of selected
marker strand, plus the selected strand
D
=
Diameter of a single strand - .0063 inch (.16mm)
Angle of Advance
=
Angle whose tangent is P/C
P
=
Pitch of braid measured along axis of cable
C
=
3.14 (Outside diameter of cable minus 2D)
3.3.7 Dimensions.
3.3.7.1 Outside diameter. The outside diameter of unshielded completed cable shall be specified in
table II. When portions of the cable are slightly flattened or of oval cross-section, the average of two
diameters measured 90° apart at any section shall be within the specified dimensions.
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