MIL-DTL-55021D
4.6.13 Braid angle and shield coverage. The shield braid angle and the percent coverage of the
braid shall be determined by the following formula:
Tan a = 2š (D+2d) P/C
2
k = 100 (2f-f )
Where:
k = percent coverage
f = EPd/sin a
P = picks per inch (the number of times the carrier in a braid cross over each other
in the same direction along the longitudinal axis for each inch of length) of
cable length
a = angle of braid with axis of cable
E = number of strands per carrier
d = diameter of one shield strand
D = diameter of cable under shield*
C = number of carriers
* = (basic wire diameter) X (geometry cable factor)
where the geometry cable factor is:
1.0 for singles
1.64 for pairs
1.95 for triples
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the
contract or order (see 6.2). When packaging of materiel is to be performed by DoD or in-house contractor
personnel, these personnel need to contact the responsible packaging activity to ascertain packaging
requirements. Packaging requirements are maintained by the Inventory Control Point's packaging
activities within the Military Service or Defense Agency, or within the military service's system commands.
Packaging data retrieval is available from the managing Military Department's or Defense Agency's
automated packaging files, CD-ROM products, or by contacting the responsible packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature, which may be helpful, but is not
mandatory.)
6.1 Intended use. This specification is being retained as a military detail specification because of the
o
unique military requirements for use in systems operating in an environment from -65 to 200 C. Cable
covered by this specification is intended for use in the hook-up of various electronic assemblies as
specified in the specification sheets. Cables constructed with PVC insulated wires or jacketing are not to
be used for aerospace equipment.
6.1.1 PVC jacketed cable. PVC jacketed cable is intended for use at temperatures between -40
and 105 °C.
6.1.2 Polyamide jacketed cable. Polyamide jacketed cable is intended for use at temperatures
between -40 and 105 °C.
6.1.3 PTFE jacketed cable. PTFE jacketed cable is intended for use at temperatures between -65
and 200 °C.
6.1.4 FEP jacketed cable. FEP jacketed cable is intended for use at temperatures between -65
and 200 °C.
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