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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
5.2 The angle of the metal armor shall be determined from the tangent of the angle by reference to a
table of natural trigonometric functions.
5.3 Unless otherwise specified in the detail specification, two specimens, one from each end of the
inspection unit, shall be tested.
5.4 The angle of the braided metal armor of the inspection unit shall be the average of the results
obtained from the specimens tested.
5.5 The angle of the braided metal armor of the inspection unit shall be recorded to the nearest 5°.
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