MIL-DTL-23928G
h.
The bus work shall not be mechanically damaged nor the bus clearance distances reduced below the
minimum requirements.
i.
For electronic circuit breakers, trip unit adjustable settings shall not change position.
Following the shock tests, the panel shall pass the dielectric strength test as specified (see 4.5.7).
3.6 Workmanship. The length of overhanging edges shall be kept to a minimum and all external projecting edges
and sharp corners normally exposed shall be rounded. Joined parts shall fit as tightly as expected with good
manufacturing practice and workmanship. The panels shall be free of cracked or displaced parts, burrs, and other
defects which will affect the life, serviceability, or appearance.
4. VERIFICATION
4.1 Test equipment and inspection facilities. The manufacturer shall establish and maintain a calibration system in
accordance with ISO/IEC 17025, ISO 10012, or equivalent system as approved by the qualifying activity.
4.1.1 Classification of inspections. The inspection requirements specified herein are classified as follows:
a.
First article inspection (see 4.2).
Conformance inspection (see 4.3).
b.
4.2 First article inspection. First article inspection shall include the examination of 4.4 and the tests of 4.5. The
manufacturer shall provide verification to the procuring activity that the first article inspection has been performed on
the samples supplied to the requirements of this specification. When a special panel is a modification of a standard
panel, which has passed first article inspection, only those tests necessary to verify the differences need be
performed.
4.2.1 Sample size. The contractor should submit one sample panel of the type, class, and composition for which
the first article acceptance is sought. Acceptance will be allowed for all panel sizes of the composition submitted.
4.2.2 Failure. One or more failures of first article examination or tests shall be cause for rejection.
4.3 Conformance inspection. Conformance inspection shall consist of the examination and tests of table III.
TABLE III. Conformance inspection.
Inspection
Requirement
Test method
General examination
4.4
Effectiveness of enclosure 1/
4.5.2
Dielectric strength
1/ Watertight and submersible only.
4.3.1 Inspection lot. Equipment of the same type, class, and composition offered for delivery at one time is
considered a lot for purposes of conformance examination and testing.
4.3.2 Sampling. Equipment selected in accordance with table IV should be subjected to the conformance
examination and tests. Failure to conform to the requirements for this specification for any test will be counted as a
defect and the equipment rejected. When the number of such nonconforming equipment, in any sample, exceeds the
acceptance number for that sample, the lot represented by the sample will be rejected.
4.3.3 Rejected lots. When an inspection lot is rejected, the contractor may replace it with a new lot, rework it to
correct defects, or screen out the defective units, and again inspect it. Such lots should be sampled in accordance
with tightened inspection sample sizes specified in table IV. Reinspected lots should be kept separate from new lots
and shall be clearly identified as reinspected lots. Acceptance criteria apply as specified (see 4.3.2).
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