FED-STD-228A
Method 1173.1
18 April 2014
THICKNESS, BEDDING; DIAMETER TAPE
1. SCOPE
1.1 This method is intended for use in determining the thickness of bedding of armored cable. It is
recommended for use when the wire or cable has an over-all diameter of one inch or more.
2. SPECIMEN
2.1 The specimen should be a piece of the inspection unit at least 6 inches in length from which any
covering over the bedding has been removed.
3. APPARATUS AND REAGENTS
3.1 The apparatus and reagents shall be as follows:
3.1.1 Diameter tape graduated to read at least 0.01 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 diameter tape shall be applied directly
over the bedding of the specimen in such a manner that the bedding is not distorted. The diameter over
the bedding shall be read from the tape and the value recorded as D1.
4.2 The bedding shall then be removed from the specimen and any saturants, fibers, or other extraneous
material removed from the surface of the core (assembly under the bedding) 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 bedding and the value recorded as D2.
4.3 The diameter over the bedding and over the core shall be determined as nearly as practicable at the
same place.
5. RESULTS
5.1 Calculation. The thickness of the bedding at any place shall be calculated as follows:
Thickness, inch=D1-D2
2
where:
D1=the diameter over the bedding at the place measured, inches.
D2=the diameter over the core at the place measured, inches.
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