MIL-DTL-29606A
4.7.4 Conductor elongation, tensile strength, and break strength.
4.7.4.1 Soft or annealed copper. Elongation tests of soft or annealed copper conductors
shall be performed in accordance with MIL-STD-2223, Method 5002, except that the elongation
at break of the individual strand or of the first strand of the whole conductor, as applicable, shall
be determined by means of a recording chart, or other means, on the testing machine rather than
by measuring the specimen after the break. For sizes 22 and smaller, the tests shall be
performed upon the whole conductor and the elongation measured when the first strand of the
conductor breaks. For conductors larger than 22, strands shall be carefully removed from the
conductor and tested for elongation. Tensile or break strength measurements are not required
for annealed copper conductors.
4.7.4.2 High strength copper alloy. Elongation and tensile strength tests of high strength
copper alloy conductors shall be performed in accordance with MIL-STD-2223, Method 5002,
except that the grip separation speed shall be 2 inches per minute. The tensile strength (reported
as the tensile breaking strength of the conductor rather than in pounds per square inch) and
elongation at the break of the individual strand or of the first strand of the whole conductor, as
applicable, shall be determined by the means of a recording chart, or other means, on the testing
machine. Tests shall be performed upon the whole conductor and the break strength and
elongation measured when the first strand of the conductor breaks.
4.7.4.3 Aluminum conductors. Elongation and tensile strength tests of aluminum
conductors shall be performed in accordance with MIL-STD-2223, Method 5002. A sample of
single strands shall be carefully removed from the conductor and tested for tensile strength and
elongation.
4.7.5 Conductor resistance. The DC resistance of the conductor shall be measured in
accordance with MIL-STD-2223, Method 5003, except that the wire shall be tested dry without
immersion.
4.7.5.1 Electromotive force (thermocouple extension only). A thermocouple shall be
formed between the positive and negative leg conductors from a sample taken from each coil or
reel to be supplied in the contract or purchase order. The electromotive force characteristics of
the wire shall be determined at 0 °C, 200 °C, 400 °C, 600 °C, 800 °C, and 1000 °C.
The electromotive force characteristics shall meet the following tolerances:
LIMITS OF ERROR FOR THERMOCOUPLE
Thermocouple
Standard Limits
Special Limits
Range °C
(Whichever is greater)
(Whichever is greater)
0 to 1250 °
+2.2 °C or ±0.75% xT
±1.1 °C or ±0.4% xT
Where T = Test temperature
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