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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. VERIFICATION

4.1 Classification of inspections. The inspection requirements specified herein are classified as

conformance inspection (see 4.4).

4.2 Test equipment and inspection facilities. Test and measuring equipment and inspection facilities

of sufficient accuracy, quality, and quantity to permit performance of the required inspections shall be

used. The establishment and maintenance of a calibration system to control the accuracy of the

measuring and test equipment shall be in accordance with NCSL-Z540.3 or equivalent.

4.3 Inspection conditions. Unless otherwise specified in the applicable test method, inspections shall

be conducted under the following environmental conditions.

a. Temperature: 15�C to 35�C.

b. Pressure:

Normal atmospheric.

c. Humidity:

Prevailing ambient (25 to 90 percent relative).

4.4 Conformance inspection. Conformance inspection shall consist of groups A, B, and group C and

shall be performed on every lot of cord procured under this specification.

4.4.1 Inspection lot. Unless otherwise specified (see 6.2), a lot shall consist of all cord of the same

PIN, produced under essentially the same conditions on the same machine, which is presented for

inspection and shipment at one time.

4.4.2 Unit of product. The unit of product shall be a continuous length of cord of the quantity offered

for inspection on one coil, one reel, or one spool, as applicable.

4.4.3 Group A inspection. Group A inspection shall be as specified in table I. Group A inspection

may be performed at an appropriate stage of the manufacturing operation rather than on the finished

cord. The inspections shall be performed on every lot of cord acquired under this specification.

TABLE I. Group A inspection.

Inspection

Requirement

Verification

Visual and mechanical inspection

3.12

4.5.1

of finished wire on reels

Tensile strength and elongation of strands

3.3

4.5.2

Visual and mechanical inspection of completed

3.12

4.5.3

cord assembly

Electrical test of finished wire

Continuity

4.5.4

DC resistance

3.9.1

4.5.5

Dielectric strength and insulation resistance

3.9.2

4.5.6

Electrical tests of finished cord assembly