DG 1110-3-106
illumination elsewhere. Where practical, lighting should
master station call button. The master station should
be designed for specific local tasks instead of providing
have volume controls on input and output, an all-call
uniform general levels. For example, lighting for
feature, and indicators for announcing incoming calls.
individual study carrels should be designed for a local
Speakers should be the flush-mounted type. Medium
illuminating of 70 foot-candles (the Illuminating
and large size classrooms must be furnished with
Engineering Society standard for classroom lighting),
receptacle and wiring for microphones and speakers
while lighting for general room illumination need be
for amplified audio distribution.
designed for only 30 foot-candles (minimum).
A class bell system may be incorporated into the
c. Electrical Power Distribution.
public address system.
In order to reduce line losses which occur at lower
voltages, power should be distributed at the highest
g. Central Television System.
practical voltages. Substation transformers should be
A central television antenna system may be required.
located throughout the school to reduce the voltage to
Antenna outlets should be located adjacent to
277/480 volts for fluorescent lighting, heavy equipment
convenience outlets in classrooms and lounges.
operation, and power distribution. A second set of
Conduit, terminal box, outlet and junction box
transformers should be provided to step the voltage
locations and sizes; the choice of using either CATV
from 480 to 120/208 for convenience outlets. Primary
or MATV system facilities, or the provision of a
electric service should be underground from the nearest
complete local-building-type antenna system, must be
pole or manhole to a pad mounted transformer(s)
coordinated with the local Communications-Electronics
located outdoors below grade, and as close to the load
Officer at the earliest practicable phase of design.
Where a non-government owned antenna system is to
centers as practicable. Secondary electric service from
be utilized, built-in system features such as empty
transformer(s) should also be underground. Service and
distribution equipment should be of the circuit breaker
conduits and pull wires, terminal cabinets, and antenna
or fusible switch type, and branch circuit panelboards
outlets only will be provided with project funds.
should be of the circuit breaker type. Shallow closets
should be provided for electrical, telephone and
h. Special Features.
auxiliary system equipment, where required.
Special receptacles for teaching equipment and task
Distribution of power within the building should be in
lights, lights with dimmers and lights for platform
trenches or overhead raceways located to afford
illumination shall be provided in classrooms as
maximum flexibility in room power requirements and
required by the using agency. Other features, such as a
ready accessibility for circuit revisions.
central information phone to orient the physically
handicapped, may also be required.
d. Emergency Lighting.
Illuminated exit signs and emergency lights must be
Computer-controlled and electronic training equipment
provided for all emergency exits and passageways as
may require special environments. Refer to equipment
required by the NFPA Life Safety Code No. 101.
manuals to establish criteria and specifications for
radio frequency shielding, thermal conditions, signal
e. Telephone System.
grounding, and power fluctuations.
Building telephone service should be underground with
main terminal cabinets located in mechanical or
i. Specifications.
electrical equipment rooms. Telephones and lines will
Applicable CE guide specifications include the CE 303
be provided by the local Communications-Electronics
series.
Officer. However, the building must include outlets in
key areas, identified in Chapter 3, including areas
(7) Fire Safety.
reserved for public telephones. Placement of outlets
and empty telephone raceway systems must be
a. Criteria.
designed in conjunction with the building design, and
Criteria for fire protection, including fire and/or
coordinated with the local Communications-Electronics
smoke detection systems, fire alarm and evacuation
Officer. Evidence of such coordination should be
signal systems, and extinguishment systems, are
provided in the project design analysis.
prescribed in
MIL-HDBK-1OO8A,
f. Intercom/PA Systems.
AEI - Design Criteria, TM 5-812-2 and TM 5-813-6.
An intercommunication system must be provided,
These are generally based on the National Fire Code.
consisting of a master station capable of selectively
paging through individual loudspeakers in selected
areas and offices. The loudspeaker stations should be
the talk-back type, and include a conveniently located
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