MIL-DTL-5846D
3.3.2.4.1 General. Each duplex wire shall have an individual insulated chromel and
alumel conductor laid side by side and covered with a tightly woven braid of glass fiber
or other suitable material.
3.3.2.4.2 Color. The duplexing outer braid of the wire shall be color coded in accordance
with Tables IV, V, and VI below.
TABLE IV. Insulation color code for single*, duplex, and extension thermocouple wires.
Metallic Composition
Color code
Positive
Negative
Iron (+) Constantan (-)
Black
Yellow
Copper (+) Constantan (-)
Red
Yellow
Chromel (+) Alumel (-)
White
Green
*For single thermocouple wires, the individual insulated wire shall be color coded as
indicated above, based on the metallic composition and polarity specified, i.e., iron (+) =
black, alumel (-) = green.
TABLE V. Jacket color code for duplex thermocouple wires.
Metallic Composition
Color code
Overall
Tracers
Iron-constantan
Type I Solid or stranded conductors
Class C Solid conductors, high
Light Blue
1-Red
accuracy EMF
1-Blue
Class E Stranded conductors, high
Light Blue
1-Red
accuracy EMF
1-Blue
Class H Stranded conductors, standard
Light Blue
2-Red
accuracy EMF
1-White
Class J Stranded conductors, standard
Light Blue
2-Red
accuracy EMF
1-White
9
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