MIL-DTL-13075C
3.3.3 Wire W-124. Wire W-120 shall consist of a single conductor, insulated and braided (see 3.3.6).
The conductor shall be insulated with Buna-S to a minimum diameter of 0.245 inch (6.22 mm) and a
maximum diameter of 0.265 inch (6.73 mm).
3.3.4 Wire W-125. Wire W-125 shall consist of two conductors, each insulated and braided (see 3.3.6).
The two insulated and braided conductors shall be laid parallel and covered with a common, lacquered,
moisture-proof, flame and fungus-resistant braid, similar to that provided on the individual conductors.
The conductors shall be insulated with Buna-S to a minimum diameter of 0.245 inch (6.22 mm) and a
maximum diameter of 0.265 inch (6.73 mm).
3.3.5 Wire W-128. Wire W-128 shall consist of a single insulated, unbraided conductor. The conductor
shall be insulated with Buna-S to a minimum diameter of 0.345 inch (8.76 mm) and a maximum diameter
of 0.365 inch (9.27 mm).
3.3.6 Braid. For Wire W-124 and W-125, each insulated conductor shall be covered with a braid made of
black cotton thread No. 20 or finer, closely woven. A similar braid shall be applied over the two insulated
and braided conductors of Wire W-125. The braid shall be given a flexible, flame-proof, lacquer finish,
rendering the braid completely waterproof and presenting a polished surface. The lacquer shall contain 5
to 6% of salicylinide based on the solids content of the lacquer.
3.4 Performance. Unless otherwise specified herein, all requirements shall be met on finished wire.
3.4.1 Dielectric withstanding voltage. The wire shall withstand the voltage as specified in 4.3.2 for 5
minutes (minimum) without breakdown.
3.4.2 Insulation resistance. After meeting the dielectric strength test specified in 4.3.3, the insulation
resistance of each length of wire shall be not less than the following values:
1500 megΩ thousand feet
Wires W-124 and W-125
1800 megΩ thousand feet
Wire W-128
3.4.3 Electrostatic capacitance and power factor. Samples from each lot of each type of wire submitted
for inspection shall be subjected to the test for electrostatic capacitance as specified in 4.3.4. The
capacitance shall not exceed the following values:
Wires W-124 and W-125
55 mmf per foot
Wire W-128
35 mmf per foot
The power factor shall not exceed 2% at a frequency of 1 megacycle, when measured in conjunction with
the capacitance test.
3.4.4 Continuity. Each conductor shall have continuous continuity.
3.4.5 Conductor insulation tests. Physical properties and cold bend tests of the Buna-S insulations shall
meet the requirements of 3.3.2.
3.5 Workmanship. The wire shall be uniform in quality and free from defects that affect performance,
serviceability, or appearance, such as lumps, kinks, splits, abrasions, scrapes, corroded surfaces, and
skin impurities. The wire shall be a uniform and consistent product and shall be free from defects that
adversely affect the serviceability of the product.
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