MIL-DTL-13241D
3.4.3 Breaking strength.
3.4.3.1 WS-12( )/U. The breaking strength of WS-12( )/U shall be not less than 4,946 pounds.
3.4.3.2 WS-13( )/U. The breaking strength of WS-13( )/U shall be not less than 2,236 pounds.
3.4.4 Elongation. The elongation of the stranded wire WS-12( )/U and WS-13( )/U shall be not less
than 1.0 percent.
3.5 Electrical characteristics.
3.5.1 DC resistance of strands. The dc resistance when measured on samples taken not more than
25 feet from either end of any length of strand shall correspond to a resistivity not greater than 28.6 ohms
per circular mil-foot at 68°F. The resistance when measured on samples taken from the mid-portion of
any coil or reel shall correspond to a resistivity not greater than 26.5 ohms per circular mil-foot at 68°F.
When temperatures differ from 68°F, corrections shall be based on a temperature coefficient of resistance
of 0.0021 per °F.
3.6 Workmanship. Strands and completed wire furnished under this specification shall be
manufactured in a thoroughly workmanlike manner. All material shall be sound, of uniform quality and
condition, and free of cracks and other defects which may adversely affect its serviceability.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as
conformance inspection (see 4.3).
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 Conformance inspection. Conformance inspection shall consist of groups A and B inspections as
specified in 4.3.5 and 4.3.6 respectively, and shall be performed on every lot of cable procured under this
specification. Sampling inspection shall be accomplished for each lot in accordance with 4.3.2.
4.3.1 Lot. A lot shall consist of all cable manufactured under substantially the same conditions and
offered for inspection at one time.
4.3.1.1 Lot size. The lot size shall be defined as the number of units of product submitted for
inspection.
4.3.1.2 Unit of product. A unit of product shall be defined as the continuous length of cable
contained on a single reel, spool, or in a package.
4.3.1.3 Specimen. A specimen is a single piece of finished wire which is taken from a sample unit
and subjected to inspection.
4.3.2 Sampling. A random sample shall be selected from each lot as specified in table III.
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