MIL-DTL-3432J
4.7.4 Insulation resistance. Insulation resistance of the cables shall be determined as specified in method 6031 of
FED-STD-228 except that:
a. The test shall be performed only on finished cables.
b. The insulation resistance shall be measured immediately after the voltage withstand test, and optionally after
the cable has been immersed at least six hours. The cable may be tested dry.
c. The test voltage shall be not less than 200V nor more than 500V dc.
d. The polarity of the conductor shall be maintained negative with respect to the water.
e. For unshielded cables, the potential shall be applied between two terminals. One will test each conductor in
turn, and the other will test all the remaining conductors and uninsulated ground drain wires, if present, tied
together in electrical contact with the water.
f. For shielded cables, the potential shall be applied between two terminals. One will test each conductor in turn,
and the other will test all the remaining conductors, the uninsulated ground drain wires, if present, and the
shields tied together, in electrical contact with the water. Cables with an overall shield shall not be immersed
in water and shall be tested dry.
g. If the measurement is made at a temperature other than 15.6°C, the manufacturer shall correct the measured
value of insulation resistance to the resistance at 15.6°C. If the insulation resistance is equal to or greater
than that required by 3.5 when the measurement is made at temperature greater than 15.6°C, no correction
factor is needed. The manufacturer shall demonstrate that the correction factor is accurate for his compound.
h. Insulation resistance may be determined in less than 1 minute, if the galvanometer has ceased fluctuating
and the reading indicates that a steady insulation resistance value has been obtained.
4.7.5 Direct current resistance. The direct current resistance of each conductor and uninsulated ground drain wire,
if present, shall be measured on the finished cables as specified in FED-STD-228, method 6021.
4.7.6 Surface resistance. The uninsulated conductors and jacketed cables shall be tested in accordance with
method 6041 of FED-STD-228 or method 1340 of UL 1581. All specimens, after having been provided with the
required electrodes but prior to testing, shall be cleaned by the procedure described in the test method. In positioning
the specimens in the test chamber, the specimens shall be placed so that their ends are a minimum of 1 inch from
any wall of the chamber unless otherwise specified in the test procedure.
4.7.7 Hot creep (crosslink polyethylene). The crosslink polyethylene insulation shall be tested in accordance with
ICEA-T-28-562.
4.7.8 Cold bend.
4.7.8.1 Specimens. One length of cable from each sample unit shall be prepared for test. The length shall be
divided into two parts. Provide one specimen for checking inked markings and jacketed cable as a whole, and a
duplicate specimen for checking insulated conductors apart from the finished cable. The set shall be tested aged. If
failure occurs to any one specimen, two additional specimens shall be prepared from the same sample unit and
tested. If either of the additional specimens fail testing, the sample unit represented thereby shall be considered
defective.
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