UFC 3-535-01
17 November 2005
12-1.10
Independent Power Sources
An alternate independent power source qualifies as emergency standby power only if it
is generated by a separate power generating station and routed over separate power
lines. In most cases in the past, careful investigation revealed that seemingly
independent sources were so interconnected that failure of one could result in failure of
the other. Exercise extreme care when determining the qualifications of alternate power
sources before opting against an engine/generator for standby power.
12-1.11
Airfield Lighting Control
The control system for airfield lighting consists of control panels, relaying equipment,
accessories, and circuits which energize, de-energize, select lamp brightness, and
otherwise control various airfield lighting circuits based on operational requirements.
Control of any one airfield lighting system is normally provided at two points only: the
control tower, and the vault which powers the system. See Figure 12-2 for a typical
lighting vault block diagram. A transfer relay assembly is provided at the vault to transfer
control from the remote location to the vault when necessary:
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