MIL-DTL-16377J(SH)
3.5.11 Enclosures. Enclosures shall be as specified in 3.5.11.1 through 3.5.11.7, and as specified in the
applicable specification sheet. There shall be no evidence of failure when fixtures and parts are tested as specified in
4.8.14 to determine effectiveness of the enclosures.
3.5.11.1 Enclosures, type I, class 1. Enclosures for Type 1, Class 1 fixtures shall be as specified in the
applicable specification sheet. Thickness of aluminum, where used, shall be not less than 0.090 inch, unless
otherwise specified in the applicable specification sheet. Grade of materials where not specified shall be
manufacturer s choice.
3.5.11.2 Enclosures, type I, class 2. Enclosures for Type 1, Class 2 fixtures shall be as specified in the
applicable specification sheet. The enclosures shall be made of aluminum. Aluminum or zinc die cast ends may be
used in assembly with sheet aluminum mid-section. Die cast ends shall not be in direct contact with the shock
mounts. Grade of aluminum used shall be manufacturer s choice. Unless otherwise specified in the applicable
specification sheet, thickness of aluminum shall be not less than 0.090 inch. For personnel safety while cleaning or
relamping fixture, a small compartment with removable cover shall be provided at each end within the enclosure for
the purpose of containing the necessary parts and wiring connections. Areas in way of shockmount bolts shall be
indented to receive gaskets and shock mounts as shown on figure 6. The enclosure shall be sufficiently rigid to
ensure effective alignment and closure between enclosure and lens upon completion of shock tests conducted on
assembled fixtures. Cable entrance hole shall be of a size and shape to suit the style of cable entrance fitting.
Protective cover shall be provided as specified on figure 19.
3.5.11.3 Enclosures, type II, classes 1 and 2. Enclosures for Type II, Classes 1 and 2 fixtures and lights shall
be as specified in the applicable specification sheet.
3.5.11.4 Enclosures, type III. Enclosures for Type III, Classes 1 and 2 luminaires, when designed as a
replacement for legacy luminaires, shall mount up in the same locations using the same hardware as the legacy
fixtures and shall not exceed the dimensional envelope of the legacy fixtures. Grade of materials where not
specified shall be manufacturer s choice.
3.5.11.4.1 Additional class 2 requirements. For personnel safety while cleaning or changing arrays, all wiring
connections will be made in a small compartment with removable cover. Areas in way of shockmount bolts shall be
indented to receive gaskets and shock mounts as shown on figure 6. The enclosure shall be sufficiently rigid to
ensure effective alignment and closure between enclosure and lens upon completion of shock tests conducted on
assembled fixtures. Cable entrance hole shall be of a size and shape to suit the style of cable entrance fitting.
3.5.11.5 Parts. Enclosures shall incorporate all parts specified in the applicable specification sheet. Parts shall
be firmly attached to the enclosure.
3.5.11.6 Drainage. When specified in the applicable specification sheet, enclosures shall provide for drainage
of water vapor condensation through drain holes or other means located so as to provide for maximum drainage
when fixtures and light are mounted in their normal operating position.
3.5.11.7 Gasket groove. Gasket groove for watertight Type I, Class 2 fixtures and Type III luminaires utilizing
legacy Type I, Class 2 windows shall be as shown on figure 7.
3.5.12 Shock. Fixtures and parts, as specified in 3.5.12.1 through 3.5.12.3, shall withstand, without damage or
loosening of parts, the shock test specified in 4.8.7.
3.5.12.1 Types I, II, and III, class 1 fixtures. Unless otherwise specified in the applicable specification sheet,
Types I, II, and III, Class 1 fixtures shall withstand the high impact (H.I.) shock for Grade B, Type A equipment in
accordance with MIL-S-901.
3.5.12.2 Types I, II, and III, class 2 fixtures. Unless otherwise specified in the applicable specification sheet,
Types I, II, and III, Class 2 fixtures shall withstand the H.I. shock for Grade A, Type A equipment in accordance
with MIL-S-901. Type I lamps shall show no permanent loss of illumination during shock test. Failure of the
Type II lamp filament does not constitute failure of the fixture tested. Type III luminaires shall show no permanent
loss of illumination during test.
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