MIL-DTL-5846D
TABLE III. Electromotive force tolerance.
Type
Class
Temperature
Tolerance
Range
±2.8° C
0° C to 350° C
A, B, C
1
±0.75
350° C to 1000° C
D, and E
Percent
±4.0° C
0° C to 300° C
A
2, 3 and 4
3.3.1.5 Size. The area of the conductors for Type 1 shall be as specified in Table I. The
area of the conductor shall not exceed 5 percent under or 5 percent over the nominal
value specified.
3.3.2 Insulation. The wire insulation shall consist of a concentric layer or layers of
suitable materials, capable of meeting the requirements specified herein. The insulation
shall be readily removed with the conventional wire stripping machine and shall have a
uniform surface and cable diameter.
3.3.2.1 Inner wrap. The inner wrap, if used, shall consist of a suitable material which
shall be braided, woven, or wrapped tightly about the stranded conductor and be capable
of meeting the requirements specified herein. The material shall not cause corrosion of
the conductor when subjected to the temperature requirements of this specification.
3.3.2.2 Primary insulation. Each conductor shall have a primary insulation consisting of a
concentric layer of glass fibers or a multiple layer wrap of a suitable synthetic resinous
tape, or other material capable of meeting the requirements specified herein. Where a
fibrous primary insulation is used, the material shall be impregnated with a silicone resin
or other suitable compound and so applied that it will not enter the conductor strands and
affect good electrical contact. The impregnation compound shall bond the insulation
sufficiently to prevent fraying under normal conditions of installation.
3.3.2.3 Covering (individual conductors).
3.3.2.3.1 General. The covering, if used, shall consist of a braid, fibrous covering, or
other approved material placed over the primary insulation. The covering shall be
saturated with a non-hygroscopic and flame-retardant compound which will not affect the
colors of the braid to such an extent that the colors cannot be easily distinguished. The
saturating compound shall bond the covering sufficiently to prevent fraying under normal
conditions of installation.
3.3.2.3.2 Color. The insulation of thermocouple wire shall be color coded to indicate the
metallic composition and polarity of the wires.
3.3.2.4 Duplexing outer covering.
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