4, 6, OR 8 INDIVIDUAL 20-AMP BRANCH CIRCUITS
SwitchLITE
TM
MODEL EZT
Emergency Zone Transfer Cabinet
Automatic transfer between normal and emergency
power for emergency lighting and life safety circuits.
Applications:
• Theaters / Concert Halls
• Worship Facilities
• Conference Centers
• Auditoriums
• Restaurants
• Banquet Halls
• Casinos
• Sports Facilities
UL 1008
C-UL CSA C22.2, No. 178.1
DESCRIPTION & APPLICATION
The SwitchLITETM Model EZT, Emergency Zone Transfer Cabinet, allows dimmable lighting fixtures to function as essential emergency
lighting. The Model EZT is a UL 1008 listed product, designed to automatically transfer up to eight (8) branch circuits to emergency
power when normal power fails, and then back to normal power once it has been restored. Upon transfer to emergency power, lighting
fixtures that are dimmed (or off) are brought to full illumination to provide safe egress.
Model EZT Application
Figure 1 illustrates the Model EZT used in a dimmer rack
application. As shown, the hot and neutral legs of each
dimmer output circuit feeding normal/emergency lighting
are wired to one side of the Model EZT’s automatic transfer
switch. The other side of this switch is wired to the emergency power source. When normal power is lost or below
an acceptable level, both legs are automatically transferred to
emergency power.
NORMAL POWER SENSING
DIMMER OUTPUT
TO NON-EMERGENCY
LIGHTING
NORMAL
POWER
DIMMER
RACK
To satisfy various applications, user-adjustable settings are
provided to control the transfer delay time to and from emergency power. Note that optional auxiliary form C contacts are
available for each circuit to accommodate low voltage or line
voltage ballast control signal applications.
AUXILIARY CONTACTS
FOR BALLAST CONTROL
SIGNAL APPLICATIONS
HOT
DIMMER OUTPUT
TO NORMAL /
EMERGENCY
LIGHTING
NORMAL /
EMERGENCY
LIGHTING
NEUTRAL
HOT
- FIRE ALARM
- INVERTER TEST
- GENERATOR TEST
RCT
SSC
EMERGENCY
POWER
NEUTRAL
STATUS
ALARM
CONTACTS
4, 6 OR 8 CIRCUITS
(1 CIRCUIT SHOWN)
Unique to the Model EZT, an emergency power Soft Start
Control (SSC) is provided to accommodate the high inrush
current associated with energizing certain types of light fixtures.
SwitchLITE Model EZT
(Figure 1)
Emergency Power Source
Figure 2 illustrates the Model EZT’s interface with an
emergency lighting inverter or a standby generator as the
emergency power source.
A Controlled Power Company centralized emergency lighting
inverter is a true uninterruptible power source, and is ideal in
this application. A normally closed “test in progress” contact
from the inverter is connected to the Model EZT’s Remote
Command Transfer (RCT) input. This contact will open
during NFPA-mandated test periods, and the designated
emergency lighting circuits will be automatically transferred
from normal to emergency power.
In a standby generator application, the emergency lighting
circuits will experience a momentary loss of power, dictated by
the time it takes for the emergency generator to come on line.
To ensure that emergency lighting circuits are transferred from
normal to emergency power during NFPA-mandated tests,
the Model EZT’s RCT input may be connected to a normally
closed contact that opens when the facility’s Automatic Transfer
Switch (ATS) has transferred generator power to the normal/
emergency power panel.
2
RCT
NORMAL POWER SENSING
NORMAL
POWER
NORMAL /
EMERGENCY
LIGHTING
EMERGENCY
LIGHTING
INVERTER
NORMAL /
EMERGENCY
POWER
OR
NORMAL /
EMERGENCY
PANEL
SwitchLITE
Model
EZT
REMOTE COMMAND
TRANSFER (RCT),
SIGNAL INPUT
NORMAL
POWER
EMERGENCY
POWER
(GENERATOR)
ATS
NORMAL (DIMMED) POWER
RCT
(Figure 2)
NFPA-mandated 30-day and annual tests may be automatically
performed by the Controlled Power Company emergency lighting
inverter, with the test results time / date stamped and logged.
© May 2012. Controlled Power Company. SwitchLITETM and ZoneSaver™ are trademarks of Controlled Power Company.
SPECIFICATIONS & FEATURES
The SwitchLITE Model EZT automatic transfer switch is electrically operated and mechanically held (maintained) to
prevent inadvertent connection of the normal and emergency sources. When switching between two separate power sources, only a
UL 1008 listed product may be used. The Model EZT’s rugged and smart design brings performance and reliability to critical
emergency lighting applications.
Product Specifications
Normal Power Circuits
• Branch Circuit Voltage: 120 VAC or 277 VAC or 347 VAC,
60 hertz
• Branch Circuit Amperage: Rated for 20 amps maximum
each circuit, internally fused
• Number of Branch Circuits: 4, 6 or 8 individual circuits
• Branch Circuit Configuration: Standard 2 wire plus ground,
or 2 wire plus ground with an optional low voltage or line
voltage ballast control signal
• Voltage Sensing of Normal Power Source:
Single phase 120 VAC, 277 VAC, or 347 VAC
(1 wire plus neutral)
240/120 VAC or 208/120 VAC
(2 wire plus neutral)
Three phase 208 VAC, 480 VAC, or 600 VAC
(3 wire plus neutral)
Environmental Specifications
• Operating Temperature: 0°C to 40°C
• Relative Humidity: 95% non-condensing
• Elevation: 5,000 ft. (1,500 meters) maximum,
without de-rating
• BTU/HR: 255 maximum
Safety / Standards
• Listed to UL 1008 Transfer Switch Equipment, Automatic
Transfer Switch for Emergency Systems, 10,000 amp SCCR
• C-UL Listed to CSA Standard C22.2 No. 178.1,
Automatic Transfer Switches
• Complies with ANSI / NFPA 110 Standard for Emergency
and Standby Power Systems
• Satisfies requirements of the National Electric Code (NFPA
70): Articles 700, 701, 702; 518.3C, 520.7, 540.11C
Magnified view of
Status Monitor
Emergency Power Source
• Main and Branch Circuit Voltage: 120 VAC or 277 VAC
or 347 VAC, 60 hertz
• Input Circuit Breaker Required*: 60 amp maximum, 1 pole
• Branch Circuit Amperage: Rated for 20 amps maximum
each circuit, internally fused
• Maximum Continuous Current: 48 amps
• Branch Circuit Configuration: Normal power circuit
configuration is maintained and supplied with
emergency power
* Input circuit breaker provided by others, and field-installed
external to Model EZT enclosure.
Note: Optional auxiliary form C contacts are available for each
circuit to accommodate ballast control signal applications.
In emergency mode, auxiliary contacts switch state, and
may be used to apply the designated “full on” control
signal to each fixture.
Emergency Power Transfer
• Undervoltage Automatic Transfer: User-selectable at -20%
or -50% from normal power nominal voltage
• Adjustable Transfer Delay: Transfer to emergency power
0 to 9 seconds; transfer from emergency power back to
normal power 0 to 15 minutes
• Soft Start Control: User-selectable 0, 0.5, 1.0, or 2.0
seconds voltage ramp
Set of 8 Conduit
Knockouts: Located
on top and each
side of the cabinet,
provided for normal
/ emergency branch
circuits. Additional
conduit knockouts
provided for voltage sensing and
Emergency Power
Connection
Status lights indicate whether
the load is being fed from Normal
or Emergency Power.
Note: Emergency Power Connection
light is illuminated when a voltage
source is present on the emergency power input terminals. This voltage source
may be either the emergency lighting
inverter output, or a facility’s designated
normal / emergency power panel.
Keyed Cabinet
Door for security
Slotted Flange for
easy wall-mounting
Manual testing is initiated
via a keyed switch which
simulates a power failure.
Disclaimer: Location of conduit knockouts is for illustrative
purposes. Consult factory for installation drawings.
3
MODEL SELECTION GUIDE
MODEL SELECTION GUIDE
PRODUCT
CIRCUIT VOLTAGE
FREQ
NUMBER OF CIRCUITS
EZT
A = 120 VAC
X = 60 Hz
4CKT
AUX CONTACTS
0 = No Contacts
J = 277 VAC
6CKT
V = 347 VAC
8CKT
1 = Auxiliary Contacts
Included
Note: “Form C”
Contacts provided for
each 20 amp circuit
Model Number Example: EZT - AX - 8CKT - 1
Description: Quantity of eight (8), 20 amp circuits, 120 VAC (2 wire + ground),
with auxiliary contacts for each circuit.
Model EZT Enclosure
• Description: NEMA 1, powder-coated steel construction with a hinged, key-lockable front door
• Wiring: Provisions for class 1 and class 2 requirements
• Dimensions: 20” W x 7.75” D x 31” H
• Weight: 84 lbs. maximum
WARRANTY: The Model EZT is guaranteed to be free from defects in material and workmanship for a period of two (2) years following shipment from
the factory.
ZoneSaverTM UL924 Application
ZoneSaver Illustration
Controlled Power Company’s ZoneSaver is a UL 924 listed
product containing two (2) emergency load control relays.
The ZoneSaver allows for user control of emergency egress
lighting via occupancy sensors, wall switches, and dimmer
switches.
Figure 3 illustrates the ZoneSaver used in a wall switch
application. As shown, a single normal / emergency power
source is wired to egress lighting fixtures through the two
(2) wall switches. In the event of a power outage, the wall
switches are automatically bypassed and emergency power
is made available to egress lighting.
ZoneSaver is capable of supplying two (2) separate 1 pole,
20 amp circuits at 120 VAC or 277 VAC, or a single 2 pole,
20 amp circuit at 208 VAC or 240 VAC.
ZoneSaver is equipped with status lights and a test switch
to manually test emergency circuits per NFPA 101.
(Figure 3)
Note that UL 924 listed load control (shunt) relay devices may not
be used when switching between two (2) separate power sources.
Contact the factory for application and product details.
WARRANTY: The ZoneSaver is guaranteed to be free from defects in material and workmanship for a period of one (1) year following shipment from
the factory.
Represented by:
1955 Stephenson Hwy., Troy MI 48083
www.controlledpwr.com
email: info@controlledpwr.com
Phone: (800) 521-4792
Fax: (248) 528-0411
All information and data within this brochure is subject to change without notice.
EZT-001-0512