MIL-HDBK-1191
Center Lines of Beams
& Ceiling Hangers
Floor Slab
Structural and
All Dimensions are Nominal
Gravity Systems
Plumbing
Air Supply and Exhaust
Main Distribution
Plumbing
Sub-Zone
DISTRIBUTION
Electrical
(2100mm - 83" Max)
ZONE
Below Major
Branch Distribution
Structural Members
Electrical
Sub-Zone
SYSTEMS MODULE
Walk-On
Deck
CONNECTION
Room Distribution
ZONE
Ceiling
OCCUPIED
ZONE
Floor Slab
Plumbing
SYSTEMS MODULE ELEMENTS
FIGURE 19-2
19.4.3.6
Gravity Systems. The vertical depth requirement of sloped
gravity piping services should be checked to determine if such piping
will drop into the next lower distribution sub-zone or if an
intermediate riser should be provided.
19.4.4
Systems Module Electrical and Communications Considerations.
19.4.4.1
Distribution Systems. Distribution system routing
(horizontal and vertical), and the quantity and location of unit
substations, shall be based on the size of the facility, life cycle
cost analyses, overall flexibility, and long-term system reliability.
The benefits of underground utility service distribution to the utility
pods should be compared with service distribution through the
distribution zones considering flexibility, reliability and safety.
19.4.4.2
Electrical and Communications Room Locations. Electrical
and communications rooms shall be located in the utility pods and
should be stacked vertically from floor to floor. Provisions should be
made for easily running vertical cabling from floor to floor, i.e.,
conduit risers with pull boxes at each distribution zone. Cabling and
wiring shall be sized for allowable voltage drop at full design load.
For very long Systems Modules, the need for additional electrical and
communications rooms, located at opposite ends of the Systems Modules
from the utility pods, should be evaluated for maintenance of
acceptable voltage drops, reasonable lengths of secondary cable runs,
and numbers of devices per circuit. These additional rooms shall be
19-6
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