MIL-HDBK-1027/1B
2.5.3
Facility Contractor. Unless indicated otherwise,
device services should be brought to a single point close to the
exterior of the training structure. The device contractor
should make final connections after the facility contractor
leaves the site.
2.5.3.1
Electric. Electrical service designated for the
device and computer should terminate in a single-fused
disconnect in the electric room near the instructor's station.
For those buildings without an instructor's station, the
disconnect should be located in a ground-level burner room.
Power for facilities installed equipment, such as,
lights and exhaust fans, should be run through a separate, fused
disconnect and wired ready for use. This disconnect should be
located in a ground-level burner room.
Power provided should be directly from the station or
municipal grid system. If the power source needs to be modified
or "cleaned up" to protect the computer equipment, the device
contractor will provide the necessary equipment.
2.5.3.2
Data Terminal Cabinet (DTC). Exhaust fans, motorized
dampers, and motorized valves located in, a trainer should be
controlled by individual, HOA switches in the instructors
station. The automatic mode should have the necessary relays to
be energized by a 24-Vac, 100 mA, binary signal from the future
device computer. Wire each relay to the DTC. The DTC should be
located in the instructor's station, except the DTC for the 19F4
trainer should be located in the electrical space below the
instructor's station. Controls which are recommended to be
wired to the DTC should include the HOA switches and relay
mentioned above. The 24-Vac relays associated with HOA switches
wired to the DTC should be provided with arc suppression
protection. The use of non-suppressed relays can produce a
large voltage spike which is detrimental to the device
computers.
The DTC should include a terminal strip where these
controls are wired to unique lugs. Mating lugs on the terminal
strip should be ready for the device contractor to tie into to
complete the installation. Each lug should be identified by the
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