FED-STD-228A
Method 1711.1
18 APRIL 2014
OVERLAP, COTTON TAPE
1. SCOPE
1.1 This method is intended for use in determining the overlap of woven cotton tape on insulated wire
and cable.
2. SPECIMEN
2.1 The specimen should be a piece of the inspection unit sufficient to contain at least six complete
spirals of the tape from which any covering over the tape has been removed.
3. APPARATUS AND REAGENTS
3.1 The apparatus and reagents shall be as follows:
3.1.1 Steel scale graduated to 1/32 inch or finer, or its decimal equivalent.
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. Any saturants or other extraneous materials
shall be removed from the surface of the specimen by means of the cloth and solvent so as to expose the
laps of the tape. The specimen shall then be laid on a smooth horizontal surface and the distance along
the axis covered by 4 laps of the tape measured to the nearest 1/32 inch and the value recorded as 4L.
4.2 The tape shall be removed from the specimen. The tape shall be straightened; the width measured
by means of the steel scale at three places equally spaced along the length of the tape and the average
value recorded as W.
4.3 If two or more layers of tape are present, the overlap of each layer shall be determined separately.
5. RESULTS
5.1 Calculation. The overlap of the cotton tape at any place shall be calculated as follows:
Overlap, inch =W-4L
4
where:
W=the width of the tape, inches
4L=the length along the axis of the wire or cable covered by 4 laps of the tape, inches
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