FED-STD-228A
where:
T1=the thickness of the insulation of the specimen before heat treatment, inch
5.1.2 Conductors larger than 0000 AWG.
Change in thickness of insulation, percent=T3-T4 x 100
T3
where:
T3=the thickness of the specimen before heat treatment, inch
T4=the thickness of the specimen after heat treatment, inch
5.2 Unless otherwise specified in the detail specification, two specimens from each inspection unit shall
be tested.
5.3 The distortion of the insulation of the inspection unit shall be the average of the results obtained from
the specimens tested.
5.4 The distortion of the insulation of the inspection unit shall be recorded to the nearest 1 percent.
5.5 The temperature and time of exposure shall be recorded.
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