MIL-HDBK-1027/1B
anywhere on the ladder should be maintained at 2150 mm in
accordance with OSHA. The inclined ladder should be constructed
of hot-dipped galvanized steel.
b) Where an inclined ladder passes through a crawl
space, an airtight barrier should be provided so the crawl space
air cannot enter the inclined ladder space.
c) Where the inclined ladder leaving Compartment 1
passes through the first floor concrete ceiling, it should be
surrounded by a barrier. The barrier should be tight to the
ceiling and extend into the compartment to 2150 mm above
finished floor. This barrier will keep any products of
combustion higher than 2150 mm from entering the inclined ladder
space.
3.5.2
Vertical Ladders. Vertical ladders should be designed
in accordance with NAVSHIPS Dwg. 804-1749235. Following
standard shipboard design, the wraparound ladder rungs should be
177.8 mm from the wall. The rungs should be of serrated 316
stainless steel to provide a nonslip surface. A 0.83 sq. m
opening should be provided in the safety net where the ladder
passes through.
3.6
Lighting and Electrical
3.6.1
General Lighting. General lighting should be provided
for each space in a firefighting structure using appropriate
building type fixtures and switches.
The fireplace areas should use indirect lighting from
the crawl space areas. The fixture should be wall mounted at
900 mm above finished floor (AFF), facing outward or with a (25
degree) stanchion. Luminaires should not be floor mounted,
facing upward. Provide a fixture similar to that shown in
Appendix A, Figure A-22. Specify the particular type and lamp
wattage appropriate for the design (Type 1 or 2). Luminaires
should meet Underwriters Laboratories Inc. (UL) 595,
Marine-Type Electric Lighting Fixtures, for marine locations. A
globe guard should be provided. The above requirements will:
(a) protect the fixtures from heat and direct spray of the
water; (b) allow for the water to drain away from the fixture;
and (c) avoid letting water penetrate the fixture and conduit
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