MIL-C-55021/NEMA WC 55021
General Description
This 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,
or -65 to 200 degrees Centigrade. Cables constructed with polyvinyl chloride (PVC)-insulated wires or jackets are
not to be used for aerospace applications.
Part Number Designation
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B
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24
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C
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904
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-
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903
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-
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902
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P
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Wire Type
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Conductor Size
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Conductor Material
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Color of
1st Wire
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Color of
2nd Wire
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Color of
3rd Wire
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Covering over component
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Type of Wire for M55021
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Symbol Type
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Wire Specification
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B
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MIL-DTL-16878/1
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C
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MIL-DTL-16878/2
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D
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MIL-DTL-16878/3
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E
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NEMA HP 3
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EE
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NEMA HP 3
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BJ
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MIL-DTL-16878/17
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CJ
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MIL-DTL-16878/18
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DJ
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MIL-DTL-16878/19
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Finished Cable Covering Nomenclature for
M55021
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Symbol
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Covering Over Finished
Cable
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U
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Unjacketed and
Unshielded
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P
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Polyvinyl Chloride (PVC)
Jacket
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F
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Flourinated Ethylene Propylene (FEP)
Jacket
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J
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Polyamide Jacket
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T
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Polytetraflouroethylene (PTFE)
Jacket
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S
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Shielded and Unjacketed
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SF
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Shielded and covered with FEP
jacket
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SP
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Shielded and covered with PVC
jacket
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SJ
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Shielded and covered with Polyamide
jacket
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STW
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Shielded and covered with wrapped PTFE
jacket
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STX
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Shielded and covered with extruded PTFE
jacket
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Referenced Specification for M55021
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Specification
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Description
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MIL-C-572
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Cords, Yarns and Monofilaments Organic
Synthetic Fiber
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MIL-DTL-16878
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Wire, Electrical, Insulated, General
Specification for
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MIL-DTL-55021/1
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Cable, Electrical, Shielded Singles, Shielded and Jacketed Singles, Twisted
Pairs and Triples, Internal Hookup, -40 to 105°c
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MIL-DTL-55021/2
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Cable, Electrical, Shielded Singles, Shielded and Jacketed Singles, Twisted
Pairs and Triples, Internal Hookup, -65 to 200°c
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FED-STD-228
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Cable and Wire, Insulated; Methods of
Testing
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MIL-STD-681
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Identification Coding and Application of
Hookup and Lead Wire
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ASTM D3032
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Standard Test Methods for Hookup Wire
Insulation (DoD adopted)
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ASTM D4066
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Standard Classification System for Nylon
Injection and Extrusion Materials (PA) (DoD Adopted)
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NEMA HP 3
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Electrical and Electronic PTFE
(Polytetraflouroethylene ) Insulated High Temperature Hoop-up Wire; Types ET
9250 Volts), E (600 Volts), and EE (1000
Volts) (DoD Adopted)
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