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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
5. RESULTS
5.1 Calculation. The thickness of the sheath at any point shall be calculated as follows:
Thickness, inch=D1-D2
2
where:
D1=the diameter over the lead 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, one from each end of the
inspection unit, shall be tested.
5.3 The average thickness of the lead sheath of the inspection unit shall be the average of the results
obtained from the specimens tested.
5.4 The minimum thickness of the lead 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 lead sheath of the inspection unit shall be
recorded to the nearest mil or 0.0001 inch.
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