MIL-DTL-13777K
4.8.4.1.4 Ozone resistance. Two samples shall be prepared for ozone testing by bending around mandrel as
specified in table XI.
1/ 2/
TABLE XI. Cable sizes and mandrel diameters for ozone testing.
Cable outside diameter inch (mm)
Mandrel diameter inch
.500 (12.70) and under
4 x cable OD
.501 (12.73) to .750 (19.05)
5 x cable OD
.751 (19.08) to 1.250 (31.75)
6 x cable OD
1.251 (31.78) to 1.750 (44.45)
8 x cable OD
1.751 (44.48) to 2.250 (57.15)
10 x cable OD
1/ Dimensions are in inches.
2/ Metric equivalents are given
for information only.
The mandrels may be removed after bending, provided the diameter of bend of the cable samples is
maintained for am minimum of 180 degrees of bend. Prior to placing the samples into the ozone
chamber, the samples shall be wiped with a clean cloth to remove dirt, sweat and surface moisture.
The samples shall be exposed as specified in ASTM D1149 except that the air shall have an ozone
concentration of 50±3 parts per 100,000,000 by volume and circulated at 120ºF for a period of 7 days.
Upon removal form the ozone chamber the samples shall be examined for conformance with 3.8.4.
4.8.4.2 Electrical tests.
4.8.4.2.1 Test equipment. The contractor shall supply suitable bridge equipment, source of testing current and
other necessary equipment required for accurately making the electrical measurements specified. The dc
bridge measurements shall be made within an accuracy of 0.5%. The power source shall be capable of
delivering a testing potential of the magnitude and frequency specified, and shall be equipped with a variable
control and meter for regulating and measuring output. The contractor shall make available to the contracting
officer of inspector a description, wiring diagram, and operating instructions covering the equipment to be
employed. The inspector may satisfy himself by checking the equipment against calibrated standards so that
accurate and satisfactory results are obtained.
4.8.4.2.2 Voltage test (finished cable). With alternate conductors bunched in two groups, the voltage shall be
applied between conductors, and between conductors and ground for a period of one minute on each complete
length of cable. Conductors without individual shields may be tested singly against all other conductors or
arranged in two or more groups, provided full voltage is impressed between adjacent conductors. Conductors
with individual shields and shielded pairs may be arranged in groups with voltage applied between conductors
and grounded shields. The test voltage shall be attained by raising the voltage from zero to the value specified
within 30 seconds (see 3.8.2.1). Where shield isolation is specified for single conductors and complexes the
voltage shall be 1500 volts. Specimens shall not be submerged in water for the voltage test.
4.8.4.2.3 Insulation resistance. Immediately after the voltage test, the cable shall be tested dry for insulation
resistance, according to method 6031 of FED-STD-228, except that the test potential shall be 200 volt minimum
and the temperature correction factors shall be supplied and certified by the contractor. Except where
otherwise specified in the applicable specification sheet, conductors may be tested singly or grouped in
5 PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or
order (see 6.2). When packaging of materiel is to be performed by DoD personnel or in-house contractor
personnel, these personnel need to contact the responsible packaging activity to ascertain packaging
requirements. Packaging requirements are maintained by the Inventory Control Point's packaging activities
within the Military Service or Defense Agency, or within the military service's system commands. Packaging
data retrieval is available from the managing Military Department's or Defense Agency's automated packaging
files, CD-ROM products, or by contacting the responsible packaging activity.
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