FED-STD-228A
Method 1141.1
18 April 2014
THICKNESS, WRAP
1. SCOPE
1.1 This method is intended for use in determining the thickness of wraps of insulated wire and cable.
2. SPECIMEN
2.1 The specimen should be a piece of the inspection unit at least 2 feet in length from which any
covering over the wrap has been removed.
3. APPARATUS AND REAGENTS
3.1 The apparatus and reagents shall be as follows:
3.1.1 Micrometer caliper graduated to read in mils or 0.0001 inch and having flat surfaces on both anvil
and end of spindle, each approximately 0.25 inch in diameter. The surfaces of anvil and spindle shall be
parallel to within 0.0001 inch.
3.1.2 Wiping cloth.
3.1.3 Alcohol or other suitable solvent.
4. PROCEDURE
4.1 The specimen shall be free from mechanical damage. The micrometer caliper shall be applied
directly over the wrap so that the specimen can just be moved between the anvil and the spindle without
distortion of the wrap. The diameter over the wrap shall be read from the micrometer scale and the value
recorded as D1.
4.2 The wrap shall then be removed from the specimen and any fibers, saturants, or other extraneous
materials removed from the surface of the core (assembly under the wrap) by means of the cloth and
solvent. The diameter over the core shall be measured in the same manner as described for diameter
over the wrap and the value recorded as D2.
4.3 Three measurements equally spaced along the length of the specimen shall be made. The diameter
over the wrap and over the core shall be measured as nearly as practicable at the same point.
4.4 If two wraps are present, the thickness of the outer wrap shall be determined from the diameter over
the inner wrap.
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