UFC 3-535-01
17 November 2005
Figure 12-3. Power and Control System Block Diagram
CONTROL
TOWER
POWER CIRCUITS
CONTROL CIRCUITS
PRIMARY
CONTROL
PANEL
COMMERCIAL
480V, 3φ
ENGINE GENERATOR
ROOM OR SHELTER
AUTOMATIC
STANDBY
POWER
POWER
TRANSFER
SYSTEM
(15 SECONDS)
CONTROL CABLES
CONTROL POWER
120V
(TYPICAL)
480V 3φ SUPPLY
LIGHTING VAULT
VISUAL AID
PILOT
TRANSFER
SECONDARY
SERIES
CONTROL
REG
PANELS
PANELS
PANEL
120V
120/240V
TRANSFER
6.6A OR 20A
120/240V
SWITCH
SERIES
SERIES CIRCUIT
POWER
REG
TO LIGHTING
SUPPLY
120V
SYSTEMS
SERIES
VISUAL AIDS
SELECTOR
SWITCH(ES)
LOCAL
DISTRIBUTION
LIGHTS,
UTILITIES
2400 - 120/240V
120/240V
CONTACTORS
MISC. LIGHTING
CIRCUITS
166
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