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MIL-DTL-13273 Cord, Electrical, \(Retractile, 2, 3, And 4 Conductor, Wd-9/U, Wt-2/U, Wf-4/U\)This specification covers 2, 3, and 4 cadmium copper alloy stranded retractile conductor electrical cords. These cords are insulated with a natural rubber compound encased in a Buna S or Buna S and natural rubber compound jacket which is vulcanized in a helical spring coil form to produce a cord which will extend and retract freely. These cords are designed for use on communications equipment at audio frequencies, with a temperature range of -0 to 60 degrees C for continuous operation.

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MIL-DTL-13273C
4.4.4 Group B inspection. Group B inspection shall consist of the inspections specified in table II.
Group B inspection shall be performed on sample specimens that have been subjected to and have
passed the group A inspection. Group B inspection shall be performed in any order on randomly selected
sample specimens (see 4.4.6) from an inspection lot.
4.4.4.1 Group B sampling. A random sample shall first be selected from the lot. The sample size
shall be based on the inspection lot size from which the sample was selected for group A inspection.
Inspection sample size shall be specified in table IV.
TABLE II. Group B inspection.
Inspection
Requirement
Verification
Insulation and jacket, tensile strength,
-
elongation and set
Extended length
4.4.5 Group C inspection. Group C inspection shall consist of the inspections specified in table III.
Group C inspection shall normally be performed on sample specimens that have been subjected to and
have passed group A and B inspections.
4.4.5.1 Group C sampling. One cord per 1000 feet for each inspection shall be randomly selected
and inspected in any month that the cord is produced.
TABLE III. Group C inspection.
Inspection
Requirement
Verification
Static load
Retraction
Stretch
Oxygen-bomb aging
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4.4.6 Specimen length. Unless otherwise specified herein, the specimen shall be of the length
specified in the applicable test method.
TABLE IV. Inspection sample.
Lot size 1/
Sample size
1 to 8
2
9 to 90
3
91 to 150
12
151 to 280
19
281 to 500
21
501 to 1,200
27
1,201 to 3,200
36
3,201 to 10,000
38
10,001 to 35,000
46
1/ Lot size is based on the number of
units of product (see 4.4.2).
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