UFC 3-535-01
17 November 2005
existing vaults not meeting the above described location may be used, provided the
existing structure is otherwise adequate to serve the overall purpose or can be modified
economically to provide the desired facility. For new construction or major
modernization, the following is recommended:
12-1.8.1
Vault Voltage
Use 480 volts as a primary voltage within the vault.
12-1.8.2
Vault Location
Locate vaults a minimum horizontal distance of 107 meters (350 feet) from the control
tower to prevent radio interference with control equipment. The maximum horizontal
distance between an airfield lighting vault and the control tower where nominal 120 volt
control system is used (with L-841 relay panel and multi-conductor control cable) is
2,240 meters (7,350 feet). An existing vault not meeting required locations may be
used, provided the existing structure is otherwise adequate to serve the overall purpose
or can be modified economically to provide the desired facility.
12-1.8.3
Main Lighting Vault
The main airfield lighting vault should contain power distribution and control equipment
for runway and taxiway lighting circuits and any other lighting circuits that can feasibly
use this source. It also should provide adequate space for the maintenance of the
systems. Auxiliary vaults may be required for other airfield systems depending on the
airfield configuration. Locate the vaults above grade in locations that are the most
suitable as supply points. For Army airfields, size the vault for the required equipment
and work space and space allowances indicated in UFC 3-260-01. Provide a two-hour
fire rated wall to isolate the engine generator room from the regulator room.
12-1.8.4
Approach Lighting Vault
The approach lighting vault houses power distribution and control equipment primarily
for the approach lighting and sequenced flashers, but other lighting systems nearby
may also use this vault as a power source. Locate the vault adjacent to the approach
zone at a sufficient distance to satisfy obstruction criteria.
12-l.8.5
Floor Mounted Equipment
Securely bolt all floor-mounted equipment to the floor to prevent movement during
seismic disturbances.
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