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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:
L=the distance parallel to the axis of the cable in which a helical element of the armor wire makes one
complete spiral, inches
D1=the diameter over the armor, inches
D2=the diameter of the armor wire, 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 lay of twist of the armor wire of the inspection unit shall be the average of the results obtained
from the specimens tested.
5.4 The lay of twist of the armor wire of the inspection unit shall be recorded to the nearest whole
number.
48



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