MIL-DTL-13777K
3.7.3 Vulcanizing. In order that the surface of the finished cable shall present a smooth appearance, without
objectionable roughness or irregularities, the sheath shall be vulcanized and cured in place over the cable core
while contained in and restricted by a close fitting mold (see 6.5.1) or continuous lead pipe extruded directly
onto the cable. After vulcanizing, the sheath shall be a firmly bound, strong, high elastic, homogenous mass.
The sheath shall not be over-vulcanized, sticky, or tacky and shall only with extreme difficulty be separable into
layers.
3.7.4 Cable identification. The following cable identification shall be marked on the outer surface of the sheath:
PIN (see 1.2.1), Manufacturer's name, and year of manufacture.
Inked marking shall be employed. Inked marking shall repeat at intervals of not more than 23 inches
(584.20 mm) and may be continuous. Marking, at the discretion of the manufacturer, may be on either one, two
or three lines. When requested by the procuring activity, the conductor size shall be included in the
identification inscription (see 6.2).
3.7.5 Durability (ink marking). The ink marking on the sheath shall meet the durability requirements of 3.5.5.4
except that a continuous line shall not be evident through any letter or numeral.
3.8 Finished cable.
3.8.1 Cold bend. All cable shall be capable of withstanding the test voltage specified in the applicable
specification sheet and there shall be no visible signs of damage when examined under a glass having a
magnification of three diameters after cold bending in accordance with 4.8.4.1.2.
3.8.1.1 Cold bend torque. The amount of torque required to bend the cable shall not exceed that specified in
the applicable specification sheet when tested in accordance with 4.8.4.1.3.
3.8.2 Impact, bend and twist requirements. Unless otherwise specified in the applicable specification sheet,
finished cable shall comply with the following minimum impact, bend and twist requirements (mechanical tests).
Mechanical testing (minimum cycles)
Impact-200
Bend-2000
Twist-2000
The cable shall meet the mechanical tests at -65º to 160º F in accordance with 4.8.4.1.1 (see table VI) or at 68º
to 95ºF in accordance with 4.8.4.1(see table VIII) whichever is applicable. There shall be no electrical
breakdown or cracking or splitting of the outer sheath during the testing. Specimens used for this test should
be discarded without further testing. Cables 1.756 inches in diameter and larger shall be excluded from the
bend and twist tests.
3.8.2.1 Voltage test requirements. When tested in accordance with 4.8.4.2.2, the cable shall exhibit no
breakdown when subjected to the test voltage specified in the applicable specification sheet at a frequency of
60 or 400Hz.
3.8.2.2 Insulation resistance. After application of the sheath, the insulation of the completed cable shall have a
resistance value of no less than the values of R as calculated from the following formula:
R = 50,000 log D/d
Where
D = Diameter over insulation
d = Diameter under insulation
R = Insulation resistance in megohms 1000ft at 60ºF
3.8.3 Size and weight. The size and weight (if applicable) of the finished cable shall be in accordance with that
specified in the applicable specification sheet.
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