MIL-DTL-55040E
2.3 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict
between the text of this document and the references cited herein, the text of this document takes
precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a
specific exemption has been obtained.
3. REQUIREMENTS
3.1 Conductor. The conductor shall consist of 41 strands AWG (American Wire Gage) No. 40 tin-
coated soft copper and shall conform to A-A-59551 (type B, class Q) except that the lay shall be right
hand and 0.625 inch (15.88 mm) maximum.
3.1.1 Insulation. The stranded conductor shall be insulated with a rubber compound conforming to
the following physical requirements, before and after accelerated aging in accordance with 4.8.2.4.
Original
Aged
Tensile strength (minimum) pounds per square inch (psi)
600
450
Elongation
(minimum), %
250
175
Set
(maximum) inch
0.5
--
3.1.1.1 Color. The color of the insulation applied over the conductor shall be white.
3.1.1.2 Dimensions. The overall diameter of the insulated conductor shall be 0.060 ±0.003 inch
(1.52 ±.08 mm) nominal and the wall thickness at any point shall not be less than 0.010 inch (.25 mm).
3.1.2 Shield. A shield shall be applied over the primary insulation and shall consist of a minimum 31
strands of AWG No. 36 tin-coated soft copper, layed parallel, helically wound around the insulation with
33 turns minimum per foot. The individual strands shall conform to A-A-59551 (type S).
3.1.3 Jacket. The insulation and shield shall be jacketed with a smooth compound of terpolymer of
ethylene, propylene, and diene conforming to the following physical requirements before and after aging
in accordance with 4.8.2.4.
Original
Aged
Tensile strength (minimum) psi
1400
1300
Elongation
(minimum),%
350
300
3.1.3.1 Color. The color of the jacket shall be black.
3.1.3.2 Dimensions. The overall diameter of the jacket shall be 0.160 ±0.010 inch (4.06±.25 mm)
and the wall thickness shall not be less than .025 inch (.64 mm).
3.2 Construction. The jacketed electrical cable shall be helical in form with adjacent turns contiguous
to form a helical cable having a straight length of cable on each end tangent to the helical coil. The
finished electrical cable shall have a left lay in its helical section. The finished cable shall have a smooth
and uniform jacket. The helix diameter shall be 0.56±0.06 inch (14.22± 1.52 mm). The length of the
helical portions and the length of the straight ends shall be as specified by the procuring activity (see 6.2).
3.3 Performance.
3.3.1 Conditioning. The electrical cable shall be capable of returning to its original contiguous
position after extension of the coiled portion of the cable to 5 times its retracted length for 6 cycles.
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