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MIL-DTL-55021 Cable, Electrical, Shielded Singles, Shielded And Jacketed Singles, Twisted Pairs And Triples, Internal Hookup, General Specification ForThis specification covers electrical cables consisting of unshielded and unjacketed, shielded, jacketed, or shielded and jacketed twisted pairs and triples, and shielded or shielded and jacketed singles. The cable is intended for internal wiring of electrical equipment for application temperatures of -40 to 105 degrees Centigrade \(??C\), or -65 to 200 ??C. Cables constructed with polyvinyl chloride \(PVC\) - insulated wires or jackets are not to be used for aerospace applications.

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MIL-DTL-55021D
1.2.1.1 Type of wire. The type of wire is identified by a one- or two-letter symbol as specified in
table I.
TABLE I. Type of wire.
Symbol
Wire
1/
specification
type
B
MIL-DTL-16878/1
C
MIL-DTL-16878/2
D
MIL-DTL-16878/3
E
NEMA HP 3
EE
NEMA HP 3
BJ
MIL-DTL-16878/17
CJ
MIL-DTL-16878/18
DJ
MIL-DTL-16878/19
1/ MIL-DTL-16878 wire with PVC insulation should not be used for aerospace applications.
1.2.1.2 Conductor size. The conductor size is identified by a one- or two-digit number that indicates
the American Wire Gauge (AWG) size.
1.2.1.3 Conductor material. The conductor material is identified by the letter "C" for copper, the letter
"S" for copper clad steel, or the letter "H" for high strength copper alloy.
1.2.1.4 Color code. The color code of each individual wire is identified by a number built up from the
digits designating the colors as specified in 3.5.1. For single shielded and single shielded and jacketed
constructions, a dash should not be used. The color code designators for wires 2 and 3 of a twisted pair
and triplet are separated by a dash. Two groups of numbers indicate a twisted pair, three groups indicate
a twisted triple. Any order of color code designators is acceptable.
1.2.1.5 Construction of covering over the finished cable. The covering of the finished cable is
identified by a one-, two-, or three-letter symbol as specified in table II.
TABLE II. Finished cable covering nomenclature.
1/
2/
Symbol
Covering over finished cable
U
Unjacketed and unshielded
P
Polyvinyl chloride (PVC) jacket
F
Fluorinated ethylene propylene (FEP) jacket
J
Polyamide jacket
T
Polytetrafluoroethylene (PTFE) jacket
S
Shielded and unjacketed
SF
Shielded and covered with FEP jacket
SP
Shielded and covered with PVC jacket
SJ
Shielded and covered with Polyamide jacket
STW
Shielded and covered with wrapped PTFE jacket
STX
Shielded and covered with extruded PTFE jacket
1/ All single conductor constructions must include shielding; jacketing is optional.
2/ PVC insulated cable should not be used for aerospace applications.
2



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