MIL-DTL-24558B
4.5 Methods of inspection.
4.5.1.1 Visual and mechanical inspection. Each sample terminal connection box shall be
subjected to a thorough examination to ascertain that the design and construction (see 3.4),
this specification.
4.5.1.2 Materials inspection. During first article inspection (see 4.3), the contractor shall
make available to the government inspector satisfactory evidence that the parts and materials
used in the fabrication of the terminal connection box comply with all requirements of this
specification. Satisfactory evidence shall consist of purchasing documents specifying applicable
requirements or specifications, inspection and test reports, or contractor certification. If
certification is submitted, this certification shall contain a statement to the effect that inspection
and test records are available upon request for government inspection at any time within a time
frame of not less than one year from date of contract.
4.5.2 Dielectric withstanding voltage. Terminal connection boxes shall be tested in
accordance with method 301 of MIL-STD-202. The following details and exceptions shall
apply:
a.
Magnitude of test voltage - twice the rated voltage plus 1,000 volts root mean square.
b.
Nature of potential - AC.
c.
Points of applications - between isolated circuits and live parts and ground.
d.
Examination after test - equipment shall be in accordance with requirements specified
in 3.7.1.
4.5.3 Insulation resistance. After the dielectric withstanding voltage test (see 4.5.2),
insulation resistance of the first article sample terminal connection box or parts shall be
measured between all current carrying parts and noncurrent carrying parts with a megohmmeter
at a voltage not less than 500 volts direct current at 25 °C (77 °F). This test is not required for
unwired fixtures wherein plastic parts approved by Naval Sea Systems Command are certified by
the manufacturer as meeting the requirements of 3.7.2.
4.5.4 Effectiveness of enclosure. Terminal connection boxes shall be tested in
accordance with MIL-STD-108 for submersible (15-foot) or watertight enclosures as required
for the enclosure ratings designated in the applicable specification sheets. Performance during
and after the test shall be as specified in 3.7.3.
4.5.5 Vibration. Equipment shall be tested in accordance with type I vibration of
MIL-STD-167-1, except that the variable frequency test shall be omitted. Performance
requirements shall be as specified in 3.7.4.
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