MIL-C-55021 | NEMA WC 55021 Part Number Builder

M55021 Wire MIL Spec Wire

NEMA WC 55021

M55021 MIL Spec Wire Applications:

The M55021 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 applications of -40°C to +105°C for M55021/1 since the inners could be Type B, C, D or BJ, CJ or DJ and -55°C to +200°C for M55021/2 since the wire type could be Type E or EE. Cables constructed with PVC insulation or jackets are not to be used in aerospace applications.

M55021 Cable Make Up

1 items

Section 1: Wire Type

Letter Wire Specification Temperature Rating
B NEMA HP 7 (PVC)* -40°C to 105°C (TPC)
BN NEMA HP 7 (PVC/POLYAMIDE) * -40°C to 105°C (TPC)
C NEMA HP 7 (PVC)* -40°C to 105°C (TPC)
CN NEMA HP 7 (PVC/POLYAMIDE)* -40°C to 105°C (TPC)
D NEMA HP 7 (PVC) * -40°C to 105°C (TPC)
DN NEMA HP 7 (PVC/POLYAMIDE)* -40°C to 105°C (TPC)
E NEMA HP 3 (PTFE) -65°C to 200°C (SPC) / 260°C (NPC)
EE NEMA HP 3 (PTFE) -65°C to 200°C (SPC) / 260°C (NPC)
J NEMA HP 7 (PE) -40°C to 75°C (TPC)
K NEMA HP 4 (FEP) -65°C to 200°C (SPC)
KK NEMA HP 4 (FEP) -65°C to 200°C (SPC)
L NEMA HP 5 (XLPE) -65°C to 125°C (TPC)
LL NEMA HP 5 (XLPE) -65°C to 125°C (TPC)
LS NEMA HP 8 (XLPO) -65°C to 125°C (TPC)
LX NEMA HP 5 (XLPE) -65°C to 125°C (TPC)
S NEMA HP 6 (SILICONE) -65°C to 150°C (TPC) 200°C (SPC)
SS NEMA HP 6 (SILICONE) -65°C to 150°C (TPC) 200°C (SPC)
SSB NEMA HP 6 (SILICONE/GLASS) -65°C to 150°C (TPC) 200°C (SPC)
ZH NEMA HP 8 (ZH-POLYOLEFIN) -65°C to 125°C (TPC)
ZHDM NEMA HP 8 (ZH-POLYOLEFIN) -65°C to 125°C (TPC)
ZHDH NEMA HP 8 (ZH-POLYOLEFIN) -65°C to 125°C (TPC)
ZHS NEMA HP 6 (ZH-SILICONE) -65°C to 150°C (TPC) 200°C (SPC)
ZHSS NEMA HP 6 (ZH SILICONE) -65°C to 150°C (TPC) 200°C (SPC)
ZHX NEMA HP 8 (POLYOLEFIN) -65°C to 125°C (TPC)

Please Note: *PVC insulated wire can not be used for Aerospace Applications

 

Section 2: Conductor Size

Conductor Size Stranding
26 AWG - 30 AWG 7 Strands
12 AWG - 24 AWG 19 Strands
10 AWG 37 Strands

 

Section 3: Conductor Material and Stranding

Letter Conductor Material and Stranding Type Max Temperature Limit for Shield Material Only
NC Nickel Coated Copper Standard Stranding (Table 1) 260°C
NS Nickel Coated Copper Clad Steel (Table 1) 260°C
NH Nickel Coated High Strength Alloy (Table 1) 260°C
NFC Nickel Coated Copper Flexible Stranding (Table 2) 260°C
NFS Nickel COated Copper Clad Steel Flexible Stranding (Table 2) 260°C
NFH Nickel Coated High Strength Alloy (Table 2) 260°C
SC Silver Coated Copper Standard Stranding (Table 1) 200°C
SS Silver Coated Copper Clad Steel (Table 1) 200°C
SH Silver Coated High Strength Alloy (Table 1) 200°C
SFC Silver Coated Copper Flexible Stranding (Table 2) 200°C
SFS Silver Coated Copper Clad Steel Flexible Stranding (Table 2) 200°C
SFH Silver Coated High Strength Alloy Flexible Stranding (Table 2) 200°C
TC Tin Coated Copper Standard Stranding (Table 2) 150°C
TS Tin Coated Copper Clad Steel (Table 1) 150°C
TFC Tin Coated Copper Flexible Stranding (Table 2) 150°C
TFS Tin Coated Copper Clad Steel Flexible Stranding (Table 2) 150°C

Section 3, Table 1: Standard Conductor Stranding

AWG Number of Strands Nominal Single End (inch) Nominal diameter of conductor (inch)
32 7 .0031 .010
30 7 .0040 .012
28 7 .0050 .015
26 7 .0063 .019
24 19 .0050 .024
22 19 .0063 .030
20 19 .0080 .038
18 19 .0100 .048
16 19 .0113 .054
14 19 .0142 .068
12 19 .0179 .085
10 37 .0159 .108
8 133 .0113 .160
6 133 .0142 .202
4 133 .0179 .255
2 133 .0223 .325
1 259 .0179 .370

Section 3, Table 2: Conductor Stranding Flexible

AWG Size Number of Strands Nominal Single End (inch) Nominal diameter of conductor (inch)
26 19 .0040 .019
24 19 .0050 .024
22 19 .0063 .030
20 19 .0080 .038
18 19 .0100 .048
16 26 .0100 .059
14 41 .0100 .075
12 65 .0100 .093
10 105 .0100 .125
8 168 .0100 .166
6 259 .0100 .200
4 420 .0100 .250
2 665 .0100 .330
1 817 .0100 .370
0 1045 .0100 .415
00 1330 .0100 .465
000 1672 .0100 .530
0000 2109 .0100 .590
250 2449 .0100 .680
350 3458 .0100 .815
400 3990 .0100 .870

 

Section 4: Color Code


The color code for the M55021 wire construction, as specified in MIL-STD-681, is identified by a number built up from the digits designating the colors. A dash is not used for single shielded jacketed constructions and single shielded. A dash will separate the color code for wires 2-5. Color designations are classified in the groups of numbers - for five groups are a quintuple, four groups are a quad, three groups are a twisted triple and two groups are a twisted pair.

 

Section 5: Shield Material

Letter (Single Shield) Letter (Double Shield) Shield Material Type Max Temperature Limit for Shield Material
U - Unshielded ---
N Y Nickel Coated Copper 260°C
S W Silver Coated Copper 200°C
T V Tin Coated Copper 150°C

Section 6: Jacket Material

Letter Jacket Material Type and Color Maximum Temperature Limit for Jacket Material
00 Unjacketed ---
01 Extruded White Polyvinyl Chloride (PVC) 90°C (194°F)
02 Extruded Clear Polyamide 90°C (194°F)
06 Extruded or taped and heat sealed white polytetrafluoroethylene (PTFE) 260°C (500°F)
09 Extruded White Fluorinated Ethylene Propylene (FEP) 200°C (392°F)
14 Extruded White Thylene Tetra-Fluoro Ethylene (ETFE) 150°C (302°F)
20 Extruded White Perfluoroalkoxy (PFA) 260°C (500°F)
27 Extruded White Cross-Linked Polyolefin (XLPO) 105°C (221°F)
28 Extruded White Cross-Linked Zero Halogen Polyolefin (XLPOLYO) 105°C (221°F)
29 Extruded White Silicone 200°C (392°F)
30 Extruded White Zero Halogen Silicone 200°C (392°F)