MIL-DTL-8777 Wire, Electrical, Silicone-Insulated, Copper, 600-Volt, 200 Degrees CThis specification covers single conductor wire with a silicone primary insulation capable of continuous operation at 600 volts and a maximum conductor temperature of 200 degrees C \(392 degrees F\). These wires are suitable for use in aircraft and missiles using any combination of electrical loading and ambient temperature, provided the maximum conductor temperature is not exceeded. The wires covered by this specification are not intended as fire-resistant wires.

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MIL-DTL-8777F

3.4.3.1 Finished wire diameter. The diameter of the finished wire shall be as specified in the applicable

MS sheet.

3.4.3.2 Finished wire weight. When tested as specified in 4.6.4.14, the weight of the finished wire shall

be not greater than the values specified in the applicable MS sheet.

3.4.3.3 Wire outer surface. The outer surface of the wire shall be non-corrosive and flexible, and shall

be finished smooth. The multiple layers of braided material, used as the outer covering, shall be bonded

together by the heat-resistant finisher to prevent fraying. Adjacent layers of wire, when wound on a reel,

shall not stick to one another at any temperature under 200�C.

3.4.3.4 Color. The color shall be black or white as specified in MIL-STD-104, or tan as specified in the

following limits as defined by the Munsell Book of Color:

Hue

Red limit � 10R

Hue

Green limit � 5Y

Value

Not less than 6.0 (dark limit)

Chroma

Not greater than 8.0 (saturation limit)

The above color requirements shall also apply after the test specified in 4.6.4.3.1.

3.4.4 Performance.

3.4.4.1 Conductor resistance. When tested as specified in 4.6.4.1, the conductor resistance of the

finished wire shall be as specified in table I.

3.4.4.2 Finished wire flaw test. All of the finished wire shall conform to the test specified in 4.6.4.2

without electrical breakdown.

3.4.4.3 Life cycle. Following the tests specified in 4.6.4.3.1 and 4.6.4.3.2, there should be no cracking

of the outer surface or of the primary insulation as viewed visually without magnification. The test

specimen shall then conform to the test specified in 4.6.4.3.3 without electrical breakdown or flashover.

The insulation shall not cause pitting of the conductor during the test specified in 4.6.4.3.4.

3.4.4.4 Cold bend. The wire shall withstand the test in 4.6.4.4 without cracking the outer surface or

primary insulation when viewed visually without magnification. The test specimen shall then pass the test

specified in 4.6.4.3.3 without breakdown or flashover.

3.4.4.5 Oil absorption. After having been subjected to the test specified in 4.6.4.5, the increase in

diameter shall not exceed 5 percent. The insulation shall show no evidence of coming through the outer

cover. The test specimen shall then withstand the tests specified in 4.6.4.3.2 and 4.6.4.3.3 without

electrical breakdown or flashover.

3.4.4.6 Immersion. Following the test specified in 4.6.4.6, the increase in diameter shall not exceed 5

percent. The insulation shall show no evidence of coming through the outer cover. The test specimen

shall then withstand the test specified in 4.6.4.3.3 without electrical breakdown.

3.4.4.7 High temperature endurance. Following the test specified in 4.6.4.7, the test specimen shall

withstand the tests specified in 4.6.4.4, 4.6.4.5, and 4.6.4.3.3 without electrical breakdown or flashover.

Discoloration of the silver surface shall not be cause for rejection.