MIL-DTL-16377J(SH)
4.8.13 Leakage current (portable fixtures only). Leakage current test shall be conducted with the fixture, light,
or part operating at approximately the normal operating temperature. The metal portion of the fixture, light, or part
shall be ungrounded. Prior to the leakage current test, the resistance from the grounding conductor of the extension
cable to the exposed metal portion of the light shall be measured and found to be less than 0.1 ohm. For
measurement of leakage current, all connections shall be made at the end of a 2-foot long cable. An adapter may be
used to facilitate making connections to the power source and meter. To operate the fixture, light, or part, the power
source shall be connected to the proper conductors of the cable; however, the grounding conductor shall be left
unconnected except as required for this test. For leakage current measurements, each line shall be connected
successively to the grounding contact of the cable and the current flowing in the connecting wire measured.
4.8.14 Enclosure effectiveness. Effectiveness of the enclosure of the sample fixture, light, or part shall be
determined as specified herein (see 3.5.11).
4.8.14.1 Totally enclosed. No special tests are required. It shall be ascertained by examination that the
enclosure effectively performs its function and that the openings are not larger than those permitted by
MIL-STD-108.
4.8.14.2 Dripproof. Dripproof enclosures shall be tested in accordance with MIL-STD-108. The fixture, light,
or part shall be mounted in normal position when tested. There shall be no leakage except as permitted by
MIL-STD-108.
4.8.14.3 Splashproof. Splashproof enclosures shall be tested in accordance with MIL-STD-108. The fixture,
light, or part shall be mounted in normal position when tested. There shall be no entry of water into the enclosure
when the fixture, fight, or part is subjected to a stream of water as specified in MIL-STD-108.
4.8.14.4 Watertight and submersible. Watertight and submersible enclosures shall be tested in accordance with
MIL-STD-108. Before conducting this test, joints that have gaskets or sealing compound, or that have been painted,
and which are subjected to being opened and closed shall be opened and closed three times (this includes doors and
covers but does not include indicator and observation windows). There shall be no leakage of water into the
enclosure after it has been subjected to the test conditions of MIL-STD-108.
4.8.14.5 Explosionproof. Explosionproof enclosures shall be tested as specified in 4.8.15.
4.8.14.6 Combined explosionproof-watertight. Combined explosionproof-watertight enclosures shall be tested
4.8.15 Explosionproof tests. After all tests have been conducted, sample fixtures and lights having
explosionproof or combined explosionproof-watertight enclosures shall be subject to the following test.
4.8.15.1 Explosion test. A minimum of twenty explosion tests shall be performed in accordance with UL 844
for the appropriate hazardous location type. Rejections shall be based on the criteria in UL 844 for the intended
environment.
4.8.15.2 Hydrostatic pressure test. Test fixture shall pass the internal hydrostatic pressure test of UL 844.
4.8.16 Electromagnetic interference (type I and type III only). Type I and III fixtures, lights, or parts shall be
subjected to an electromagnetic interference test in accordance with MIL-STD-461.
4.8.17 Tests for glassware. Tests for glassware shall be conducted as specified herein.
4.8.17.1 Color determination test. One sample of each color of colored glassware shall be broken to determine
conformance to 3.7.7.4.
4.8.17.2 Paint removal test. Sample glassware shall be submerged in any commercially available paint and
varnish remover for a period of not less than 3 minutes to determine conformance to 3.7.7.5.
4.8.17.3 Mechanical shock test. Sample glassware shall rest with its flat surface on a soft 2-foot by 2-foot by
2-inch thick wood plank as shown on figure 18. A 3-pound polished steel ball shall be allowed to fall free and strike
the glassware on the center of the outside surface. Striking force shall be as specified in the applicable specification
sheet (see 3.7.7.6).
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