220
The Service Module: Service Zone
224
SERVICE ZONE
The service zone carriers the horizontal service distribution of the service
module. All services are downfed to the functional zone with the
exception of the gravity drains from the service module above.
All service runs will be organized on the basis of reserved subzones and
channels to simplify design and installation, and to preserve rights-of-way
for future service runs. The subzones and channels are organized as
follows:
1. Subzones: define the direction of travel of the services. They are
horizontal layers of the service zone. The main service distribution
lines are all parallel, each connecting to branches at right angles to the
mains, and the branches connecting, where required, to laterals at
right angles to the branches. The mains and laterals will run parallel to
the girders, the branches parallel to the beams.
2. Channels: define a reserved location in a subzone for a particular
service. They generally apply only to the main distribution; for
example, HVC supply ducts, etc.
With this organization it is obvious that no shortcut or point-to-point routing
of services can be permitted without jeopardizing the predictability of initial
or future installations.
The working height of the service zone is likely to be about seven feet
based on service subzone requirements. This figure is about the
maximum acceptable to some authorities before the service zone is
considered a separate story, with some consequent regulation
disadvantages.
224.1
SUBZONES
The following descriptions note the typical contents and criteria for each
subzone. See Figure 220-6.
S1
Floor Slab.
This subzone equals the depth of floor finish, topping slab and
structural slab.
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