ARCHITECTURAL AND STRUCTURAL ENGINEERING
Basic Construction Criteria
General Requirements. Permanent communication buildings shall be
windowless structures of masonry and/or concrete providing open space free of
columns and similar obstructions. Buildings housing electronic equipment
shall be of noncombustible construction. Where practicable, operating spaces
should be designed for resistance to blast, earthquakes, hurricanes, and
typhoons. In overseas locations, locally available materials and methods
shall be used wherever possible.
Equipment Spaces. Emergency generators should be located in
separate buildings, although they may be located within the operations
building if they are properly isolated from the rest of the structure in terms
of fire protection, sound attenuation, and vibration control. Battery rooms,
consisting of cells mounted on manufacturer-supplied battery racks, are
normally adjacent to the uninterruptible power supply equipment room. The
battery room should be windowless, adequately ventilated to prevent explosive
concentrations of hydrogen gas, reasonably well insulated against thermal heat
loss and heat gain, and located to minimize solar heat gain.
Frequency conversion equipment should be as close as possible to
the equipment it serves. Motor generators should be located in a separate
room to reduce noise levels and heat gains in operating spaces. Static
converters may be located in the equipment space or operating space, because
they produce minimal heat and noise. Operating spaces containing electronic
equipment usually require close temperature and humidity control. Vapor
barriers beneath floor slabs and incorporated into roofing are usually
sufficient to prevent moisture migration into and out of interior electronic
equipment spaces. Additional protection must be provided where exterior walls
form part of the equipment space.
Special Requirements. Special requirements, such as special
finishes, gaskets, or thermally isolated glazing, will be specified by the
BESEP. In some facilities, special equipment and operating characteristics may
require that the wall be constructed of nonferrous and nonmagnetic materials.
This requirement will be stated in the BESEP. Bonding and grounding for
control of compromising emanations shall be in accordance with NACSIM 5203,
Guidelines for Facility Design and Red/Black Installations. Shielded
enclosures shall conform to the requirements of NAVFAC NFGS-13093, Radio
Frequency Shielded Enclosures. Demountable Type, and NFGS-13094, Radio
Frequency Shielded Enclosures. Welded Type. Shielding, as specified in the
BESEP, shall be incorporated into the design of the structure, and its
installation shall be scheduled at a time in the construction phase when it
can be done most economically.
Foundations. Foundations design shall conform to the criteria in
NAVFAC DM-7.02, Foundations and Earth Structures.