FED-STD-228A
Method 5031.1
18 APRIL 2014
HIGH TEMPERATURE
1. SCOPE:
1.1 This method is intended for use in determining the effect of heat on insulating materials.
2. SPECIMEN:
2.1 The specimen shall consist of a 24 inch sample. One inch of insulation shall be removed from each
end to the bare conductor or conductors.
3. APPARTUS
3.1 Mandrel (5 times +.50 overall maximum diameter of wire or cable to be tested).
3.2 Weights (see table I).
3.3 Instrument capable of measuring +1% diameter of wire or cable.
4. PROCEDURE
4.1 Select the proper weight as shown in table I for the applicable size of cable or wire. The weight shall
be attached to the exposed conductor at each end. The specimen on the mandrel with the weights freely
suspended shall be placed in a circulating air oven maintained at the rated temperature of the wire or
cable for a period of 120 hours. The weight shall be removed from the specimen when the specimen has
been allowed to cool to room temperature. The bent portion of the specimen shall then be bent not less
than 180° bend in 30 seconds.
TABLE I. Diameter undersheath and weight.
Diameter under sheath (in.) Weight (pounds)
0.325 and less
2
0.326 to 0.430
2
0.431 to 0.540
2
0.541 to 0.640
3
0.641 to 0.740
3
0.741 to 0.850
3
0.851 to 1.100
6
1.101 to 1.320
6
1.321 to 1.550
6
1.551 to 1.820
6
5. RESULTS
5.1 Unless otherwise specified in the detail specification, one specimen from each end of the inspection
unit shall be tested.
5.2 The specimen shall then be subjected to the dielectric test. Following a dielectric test and within 24
hours, the specimen shall be subjected to the abrasion tests. There shall be no evidence of failure.
5.3 The weight, maximum diameter of the cable or wire, and mandrel diameter shall be recorded.
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