MIL-DTL-13777K
3.5.6.1 Shielded jackets. Over shielded single conductors, pairs, triplets or quads, there shall be applied either
a polyamide jacket 0.005 inch (.13 mm) to 0.008 inch (.20 mm) wall thickness of white or natural coloring or a
sealed jacket of polyester tapes. Polyamide jackets may be used when the diameter over the shield does not
exceed 0.200 inches (5.08 mm). Sealed tapes may be used on shields for any diameter. Sealed jackets of
polyester tapes made with adhesive coated polyester tapes or and adhesive applied between two 0.001 inch
(.03 mm) helically applied polyester tapes or polyester/polyethylene tapers consisting of 0.001 inch (.03 mm)
polyester and a 0.0005 inch (.01 mm) polyethylene. Two tapes shall be applied with a 50 percent minimum
overlap. All shielded polyamide jackets shall show no evidence of cracks or tears when subjected to the heat
stability test of 4.8.2.3. Where insulation is a requirement (electrically driven shields) the sealed polyester tape
jacket shall be tested at 1500 volts prior to cabling in accordance with 4.8.2.5.2 with no evidence of breakdown.
The polyester film shall conform to MIL-I-631, type G, form F, except for percent elongation.
3.6 Cabling. The requisite number of conductors, as required in the applicable specification sheet, shall be
cabled together with suitable lay and filler where necessary, producing an essentially circular cross section.
3.6.1 Filler. Filler material shall be one of the following materials and shall be capable of conforming to all of
the performance requirements specified for the completed cable. Clean, dry, long fiber cotton, fungus treated
to conform to the test specified in 4.7.1; twisted polyethylene film conforming to L-P-390, type I, grade 2 or
3;oriented polyethylene multi-monofilament; or polyamide fiber filler. Where found fillers such as cores or wire
replacements are required, polyethylene rod filament conforming to L-P-390, type II, grade 7 may be used.
3.6.2 Tape marker. The tape marker shall be at least .125 inch (3.18 mm) wide with marking 1 foot apart and
shall be placed under the cable separator. The year of manufacture and the name of the manufacturer shall be
clearly printed on some side of the tape between foot markings. The markings shall be clearly visible upon
removal of the tape from the cable. Other information may be included at the manufacturer's option.
3.6.3 Barrier tape. At the option of the manufacturer, a barrier tape may be applied over the assembled wires
under the cable separator. Tape material shall be polyethylene terephthalate conforming to MIL-I-631, type G.
3.6.4 Cable shield. When specified in the applicable specification sheet, there shall be applied over the
assembled wires under the cable separator, a braid consisting of tin coated copper strands having construction
and coverage conforming to 3.5.6 and wire gage sizes as listed below:
Core diameter
Shield braid sizes (AWG)
0-.300 inch
36
.301 0.900 inch
34
0.901 1.700 inch
32
1.701 and up
30
When cable shield is required, a minimum 0.001 inch (.03 mm) core tape conforming to 3.6.3 shall be applied
over the shield and over the assembled core under the shield and over the cable shield under the cable
separator.
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