MIL-DTL-13777K
3.5.2.1 Accelerated aging. When tested in accordance with 4.8.2.2, the insulation compound shall meet the
properties in table II.
TABLE II. Accelerated aging properties.
Property
Ultimate elongation (min) inches
2-7
Tensile strength (min) psi
1400
After aging
Depreciation in tensile strength (%) max.
25
Depreciation in elongation (%) max
25
3.5.2.2 Shrinkage. The shrink back of the insulation form either ends of the conductor shall not exceed
.0625 inch (1.59 mm) and there shall be no evidence of end splitting or cracking when tested in accordance
with 4.8.2.2.2.
3.5.3 Electrical properties.
3.5.3.1 Electrode spark test. At the option of the manufacturer, the conductors shall be subjected to the spark
test of 4.8.2.4.1 to assure that cracks, pinholes and similar defects do not exist in the insulation. The spark test
voltages shall be as specified in the applicable specification sheet.
3.5.3.2 Voltage breakdown (primary insulation). Prior to final cabling, 100 percent of all insulted conductors
shall show no evidence of breakdown when tested in accordance with 4.8.2.5.1.1 at the minimum tank test
voltages specified in table III. At the option of the manufacturer, the impulse dielectric test of 4.8.2.5.1.2 may
be substituted for the tank test at the minimum impulse dielectric test voltages specified below without evidence
of breakdown.
TABLE III. Minimum tank test voltages.
AWG size
1 minute tank test voltage
Impulse dielectric test voltage (kilovolts peak)
20-10
2000
10.0 kVp
8-2
3000
12.5 kVp
1-4/0
4000
15.0 kVp
3.5.3.3 Water absorption. The increase in capacitance of the insulation compound together with the nylon
covering on all sizes 12 AWG and smaller shall not exceed 3 percent when tested in accordance with
4.8.2.4.1.3. The total capacitance reading on insulated conductors 18 AWG and smaller shall not exceed
110 pF per foot at the completion of the 8-day test.
3.5.3.4 Coaxial members.
3.5.3.4.1 Capacitance. The capacitance of coaxial conductors shall be as specified in the applicable
specification sheet when cables are tested in accordance with 4.8.2.5.2.
3.5.3.4.2 Attenuation. The maximum attenuation of coaxial conductors shall be as specified in the applicable
specification sheet when cables are tested in accordance with 4.8.2.5.3.
3.5.3.4.3 Impedance. The impedance of coaxial conductors shall be as specified in the applicable
specification sheet when cables are tested in accordance with 4.8.2.5.4.
5
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business