MIL-DTL-55040E
4.8.2.3 Set. The insulation shall not exceed the maximum values in 3.1.1 when tested in
method 3161 of FED-STD-228, with the following exceptions:
a. Bench marks shall be 2 inches (50.80 mm) apart.
b. The test specimen shall be stretched so that the distance between bench marks is 6 inches
(152.40 mm); they shall be released within 5 seconds.
c. Set shall be determined one minute after beginning of release.
4.8.2.4 Accelerated aging. The insulation and jacket shall conform to the minimum aged values of
3.1.1 or 3.1.3, as applicable, when tested in method 4011 of FED-STD-228, except that the aging period
shall be 96±0.5 hours.
4.8.3 Performance tests.
4.8.3.1 Conditioning. The cable, prior to any extension and retraction tests, shall first be conditioned
by extending the coiled portion to 5 times its retracted length a total of 6 times and allowing it to retract
freely each time. The cable shall then conform to 3.3.1 when laid on a horizontal surface.
4.8.3.2 Life cycle. The resistance of the conductor shall be measured and recorded before start of
the cycling test. The cable shall then be clamped in a suitable testing machine and extended to 4 times
its retracted length for 5,000 cycles at a rate of not less than 18 cycles per minute. After completion of
the test, the retracted length and resistance values shall be specified in 3.3.2.
4.8.3.3 Extended length. The finished cable shall be positioned vertically and a load of 6 ounces
applied to the end. Measurement under suspension shall conform to 3.3.3.
4.8.3.4 Set. The cable shall be extended to 5 times its retracted length, immediately released, and
then measured as specified in 3.3.4.
4.8.3.5 Static load. The finished cable shall be extended between two adjustable clamps fastened to
a vertical support so that the coiled portion of the cable is stretched to 250% of its original retracted
length. After 48 hours, the cable shall be released from its extended position and freed from restraint by
tapping on a horizontal surface and laid in a relaxed position. After being placed at rest on the horizontal
surface for a period of 30 minutes, the cable shall be measured as specified in 3.3.5.
4.8.3.6 Retraction at low temperature. The finished electrical cable shall be placed in a temperature-
controlled chamber for not less than 20 hours at a temperature of -65±2 °F. At the end of the period and
without removal from the chamber, the cable shall be extended to 4 times its retracted length and then
released on a horizontal surface. While still at the -65 °F temperature, the cable shall be freed from
restraint by tapping on the surface and measured as specified in 3.3.6.
4.8.3.7 Voltage withstand. The voltage withstand test shall be conducted in method 6111 of FED-
STD-228, with 500 volts dc being applied between the conductor and the shield for a minimum of 5
seconds, as specified in 3.3.7.
4.8.3.8 Insulation resistance. The insulation resistance test shall be conducted in method 6031 of
FED-STD-228, using a voltage of 500 volts dc, as specified in 3.3.8.
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