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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 serving 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, one from each end of the
inspection unit, shall be tested.
5.3 The thickness of the serving of the inspection unit shall be the average of the results obtained from
the specimens tested.
5.4 The thickness of the serving of the inspection unit shall be recorded to the nearest mil or 0.0001 inch.
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