MIL-DTL-5846D
TABLE VI. Jacket color code for thermocouple extension wires Continued.
Metallic Composition
Color code
Overall
Tracers
Type III Stranded conductors (8 ohms per
200 foot length)
Class A Each strand of iron wire
Light Blue
2-Black
tinned. (120° C.)
Class B Each strand of iron wire tinned. Light Blue
2-Red
(230° C.)
Class C Iron wire not tinned.
Light Blue
2-White
Copper-constantan
Type I Stranded conductors
Class F (120° C.)
Black
1-Yellow
Class G - (230 C.)
Black
2-Yellow
Type II Stranded conductors (7 ohms per
200 foot length)
Class A - (120° C.)
Black
1-White
Class B - (230° C.)
Black
2-White
Type III Stranded conductors (20 gage
copper, 18 gage constantan)
Class A - (120° C.)
Black
1-Green
Class B - (230° C.)
Black
2-Green
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