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FED-STD-228 Test Methods For Cables And Wire, InsulatedThis method is intended for use in determining the thickness of the insulation of insulated wire and cable. It is not recommended for use when the thickness of the insulation is less than 3/64 inch.

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FED-STD-228A
where:
D1=the diameter over the sheath at the point measured, inches.
D2=the diameter over the core at the point measured, inches.
5.2 Unless otherwise specified in the detail specification, two specimens from each inspection unit shall
be tested.
5.3 The average thickness of the sheath of the inspection unit shall be the average of the results
obtained from the specimens tested.
5.4 The minimum thickness of the sheath of the inspection unit shall be the smallest of all values
averaged in determining the average thickness, 5.3.
5.5 The average thickness and minimum thickness of the sheath of the inspection unit shall be recorded
to the nearest mil or 0.0001 inch.
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