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

GAS FLAME

TINFOIL

COPPER ROD

FIGURE 1. Flammability test, procedure I.

4.6.4.8.2 Flammability test � procedure I. Six specimens of wire, each of the same size and

approximately 15 inches (381.00 mm) in length, shall be wound around a solid copper core of a diameter

approximately equal to that of an individual specimen. Tinfoil strips, 2 inches (50.80 mm) wide, shall be

wrapped around each end of the assembly in such a manner that the center 4 inch (101.60 mm) portion

of the assembly is exposed (see figure 1). The assembly shall be held or suspended in a horizontal

position within an enclosure which allows a flow of sufficient air for combustion but is free from drafts.

The top of the 2 inch (50.80 mm) all blue flame or the top of the inner cone of the optional flame shall be

applied directly under the center of the exposed 4 inch (101.60 mm) center section of the assembly for a

period of 5 minutes. The stem of the burner shall be in a vertical position and the flame spreader opening

shall be parallel to the assembly. The position of the apparatus in relation to the assembly shall be as

specified on figure 1. After removal of the flame, the assembly shall be cooled to room temperature and

shall then withstand, without breakdown, the following dielectric tests:

a. A potential of 800 volts rms, 60 Hz, applied for 5 minutes between the conductors of the wire

specimens, electrically connected together, and the metal rod (the tinfoil strips common with the

rod).

b. A potential of 800 volts rms, 60 hertz, applied for 5 minutes between conductors of alternate wire

specimens. Conductors 1, 3, and 5 shall form one electrode and conductors 2, 4, and 6 shall form

the other (see figure 1).

c. The specimen assembly shall be placed on a metal plate that is in intimate contact with and

supports the 4-inch center burned section. A potential of 800 volts rms, 60 hertz, shall be applied

for 5 minutes between the conductors of the wire specimens, electrically connected together, and

the metal plate.