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

5.2 If no thinnest point is found in the insulation of the inspection unit, the minimum thickness of the

insulation of the inspection unit should be the smallest of all values obtained from the specimens tested.

5.3 The minimum thickness of the insulation of the inspection unit should be recorded to the nearest mil

or 0.0001 inch.