MIL-DTL-13074C
3.4.1 Wire W-27. Wire W-27 shall be constructed of 7 strands of wire as specified in 3.3.1,
twisted with a left-hand lay of a maximum 3 inches in length.
3.4.2 WS-19( )/U. Wire WS-19( )/U shall be constructed of 7 strands of wire as specified in 3.3.2
twisted with a left-hand lay of a maximum 2 inch in length.
3.5 Conductor joints. Joints in conductors should be avoided, and in no case shall they exceed
two joints per strand per length of wire, with joints spaced not less than 3 feet apart. All joints
shall be butt brazed using silver alloy solder and a nonacid flux; and shall be finished smoothly in
a workmanlike manner. No twist joints shall be used. The tensile strength of a section of each
strand which includes a joint, shall not be less than 80 percent of the tensile strength of an
adjacent section of the strand of equal length without a joint. The average tensile strength of a
group of twelve strands which include joints, shall not be less than 90 percent of the adjacent
sections of the strands (see 4.6).
3.6 Breaking strength (see 4.6).
3.6.1 Wire W-27. Wire W-27 shall have a breaking strength of not less than 2200 pounds.
3.6.2 Wire WS-19( )/U. Wire WS-19( )/U shall have a breaking strength of not less than 790
pounds.
3.7 Elongation. The elongation shall be not less than 0.80 percent for a 60 inch length of
stranded conductor.
3.8 Workmanship. Strands and wire shall be manufactured and finished in a careful and
workmanlike manner in accordance with the good design and sound practice.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as
follows:
a. Conformance inspection (see 4.4)
b. Qualification 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 and
ISO 17025 or equivalent.
4.3 Qualification inspection. Each operator required to make joints in strands will submit a group
of twelve specimens of strand which include a joint with a specimen of adjacent normal section of
each. These specimens will be tested for breaking strength. An operator will be considered
qualified after submitting a group of twelve specimens which meet the requirements of 3.5.
Records of such qualifications shall be available for verification by the Government.
4.4 Conformance inspection. Conformance inspection shall consist of groups A and B
procured under this specification. Sampling inspection shall be accomplished for each lot in
accordance with 4.4.2.
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