Cable Guide: M27500 Specification - NEMA WC 27500 2012 Part Anatomy
The M27500 specification covers the requirements for special purpose and power cables. Commonly used in avionics, aerospace, military, and airframe applications, these constructions are offered in shielded and unshielded cables and are composed of specific conductor sizes, insulation types, number of conductors, shielding material and jacket compounds. Ranging from 1 to 15 conductors, the part number is a combination of digits and letters (not to exceed 16) which help identify the exact components of each cable.
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M27500
Color Coding and Shield Coverage
Color Code
The identification method is designated by a single character that denotes the color coding, identification sequence, and the amount of shield coverage. Our example indicates a “-” color coding, which requires one white conductor and one white conductor with a blue stripe all shielded with 85 percent coverage.
Shield |
Shield |
MIL-DTL-27500 |
Color |
---|---|---|---|
- |
C |
Preferred method |
Colored Stripes on White |
A |
D |
Optional Method A |
Solid Color |
B |
E |
Optional Method B |
Band Marking (wire number) |
F |
H |
Preferred Method Table A-2 |
Colored Stripes on White |
G |
J |
Optional Method A |
Solid Color Wires |
K |
M |
Optional Method C |
Number Marking on Solid Color Wires |
L |
N |
Optional Method D |
Number Marking on White Wires |
P |
R |
Optional Method B |
Band Marks per Table A-4 |
S |
T |
Optional Method B |
|
U |
V |
-- |
For Color Codes Specified |
Preferred Method - Colors are stripes on white insulation (wire #1 has no stripe).
Optional Method A - Colors are solid insulation color. Wires 11-15 have a lighter base color stripe.
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
13 |
14 |
15 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
White |
Blue |
Orange |
Green |
Red |
Black |
Yellow |
Violet |
Gray |
Brown |
Blue/Blue |
Orange/Orange |
Green/Green |
Red/Red |
Black/Black |
Conductor Size
Conductor Size
Base Wire Specification
Cable Designators (Basic Wire specifications)
A one or two letter symbol will be used to designate the specification, type, and class of the inner conductors. In the above part , the designator is “RC” meaning the cables inners are M22759/11.
Table A: Color Identification Method for Wire and Shield Coverage
Shield |
Shield |
MIL-DTL-27500 |
Color |
---|---|---|---|
- |
C |
Preferred method |
Colored Stripes on White |
A |
D |
Optional Method A |
Solid Color |
B |
E |
Optional Method B |
Band Marking (wire number) |
F |
H |
Preferred Method Table A-2 |
Colored Stripes on White |
G |
J |
Optional Method A |
Solid Color Wires |
K |
M |
Optional Method C |
Number Marking on Solid Color Wires |
L |
N |
Optional Method D |
Number Marking on White Wires |
P |
R |
Optional Method B |
Band Marks per Table A-4 |
S |
T |
Optional Method B |
|
U |
V |
-- |
For Color Codes Specified |
Number of Conductors
Number of Conductors Per Cable
Shield Type
Shield style and material
The shield style and material of the overall shields will be designated by a single letter. Above we have an “S” shield which signifies a round silver-coated copper shielding.
Shield Coverage |
MIL-DTL-27500 |
Color Identification Method |
|
---|---|---|---|
85% |
90% |
||
- |
C |
Preferred method Table A-1 |
Colored Stripes on White Wire-Stripe Color per Table A-1 |
A |
D |
Optional Method A Table A-1 |
Solid Color Wires-Colors per Table A-1 |
B |
E |
Optional Method B Table A-3 |
Band Marking (wire number) per table A-4 on Solid Colors (by AWG) per Table A-3 |
F |
H |
Preferred Method Table A-2 |
Colored Stripes on White Wire-Stripe Color per Table A-2 |
G |
J |
Optional Method A Table A-2 |
Solid Color Wires per Table A-2 |
K |
M |
Optional Method C Table A-3 |
Number Marking on Solid Color Wires (by AWG) per Table A-3 |
L |
N |
Optional Method D |
Number Marking on White Wires |
P |
R |
Optional Method B Table A-4 |
Band Marks per Table A-4 on Colored Stripes (by AWG) per Table A-3 |
S |
T |
Optional Method B Table A-4 |
|
U |
V |
-- |
For Color Codes Specified by the Procuring Activity |
Outer Jacket Material
Jacket material and temperature rating
The type of jacket is determined by a two digit number at the end of the product call out. Depending on the call out, the cable can be a single or double jacket. Single jacketed cables only have an outer jacket, but when double jacketed there is a jacket between a double shield and a jacket covering the outer shield. Since our example states an “06” jacket, we would have a single extruded taped PTFE jacket.
Shield Coverage |
MIL-DTL-27500 |
Color Identification Method |
|
---|---|---|---|
85% |
90% |
||
- |
C |
Preferred method Table A-1 |
Colored Stripes on White Wire-Stripe Color per Table A-1 |
A |
D |
Optional Method A Table A-1 |
Solid Color Wires-Colors per Table A-1 |
B |
E |
Optional Method B Table A-3 |
Band Marking (wire number) per table A-4 on Solid Colors (by AWG) per Table A-3 |
F |
H |
Preferred Method Table A-2 |
Colored Stripes on White Wire-Stripe Color per Table A-2 |
G |
J |
Optional Method A Table A-2 |
Solid Color Wires per Table A-2 |
K |
M |
Optional Method C Table A-3 |
Number Marking on Solid Color Wires (by AWG) per Table A-3 |
L |
N |
Optional Method D |
Number Marking on White Wires |
P |
R |
Optional Method B Table A-4 |
Band Marks per Table A-4 on Colored Stripes (by AWG) per Table A-3 |
S |
T |
Optional Method B Table A-4 |
|
U |
V |
-- |
For Color Codes Specified by the Procuring Activity |
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WIREMASTERS M27500 PDF CHARTS
WireMasters carries a variety of these cables in stock. We are also on the QPL, which allows us to build U00 cables in-house! You may use these charts and PDF’s as a reference, but