Installation and
Operation
Emergency Power Off System
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Table of Contents
IMPORTANT SAFETY INSTRUCTIONS SAVE THESE
INSTRUCTIONS ............................................................................................................... 1
Safety Instructions for North America ................................................................... 1
Safety Instructions for Europe, Middle East, and Africa ................................... 2
Specifications ................................................................................................................... 3
Overview .............................................................................................................................. 4
Emergency Power Off System.................................................................................. 4
EPO Box Components................................................................................................ 4
Installation .......................................................................................................................... 6
Prepare the EPO ........................................................................................................... 6
Mount the EPO (Running Conduits or Cables Along the Wall) ....................... 6
Mount the EPO (running conduits or cables behind the wall)......................... 7
Connect Devices to the EPO Box ............................................................................ 9
Mount Additional EPO Boxes ...................................................................................10
Cascade Multiple EPO Boxes ...................................................................................10
Cascade the APC Devices with CAT-5 Cables ............................................................11
Cascade the Auxiliary Device with Wire Pairs ...........................................................12
Direct Wiring Alternative............................................................................................12
Verify Connections at each EPO Box .....................................................................12
Operation ............................................................................................................................14
Engage the System......................................................................................................14
Reset the EPO System................................................................................................14
Reset the Equipment...................................................................................................15
Wiring Diagram ................................................................................................................16
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IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS
This manual contains important instructions that should be followed during installation, operation, and
maintenance of the EPO system.
Safety Instructions for North America
WARNING: Only certified electricians may install the system and the wiring to the
products IT controls.
WARNING: Assembly has not been evaluated for emergency life critical applications,
but is intended for emergency equipment power off.
Note: Wiring from the system to the products IT controls can either be installed in conduits
or installed without conduits if the wires are in accordance with Article 725 of the National
Electrical Code (NFPA 70) and Section 16 of the Canadian Electrical Code (C22.1).
Caution: Only Class 2 circuits rated 30 V or less can be connected to terminals 1–8. Class 2
circuits are defined in Article 725 of the National Electrical Code (NFPA 70) and Section 16
of the Canadian Electrical Code (C22.1). A Class 2 circuit is a source having limited voltage
and energy capacity as follows:
A. If an Inherently Limited Power Source, voltage is limited to 30 VAC or 30 VDC, and
energy is limited to 8 A.
B. If not an Inherently Limited Power Source, voltage is limited to 30 VAC or 30 VDC,
energy is limited to 250 VA, and current is limited to 1000/Vmax. The fuse is limited
to 5 A if maximum voltage is 20 V, or 100/Vmax if voltage is greater than 20 V
but less than 30 V.
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Safety Instructions for Europe, Middle East, and Africa
WARNING: Only certified electricians may install the system and the wiring to the
products IT controls.
WARNING: Assembly has not been evaluated for emergency life critical applications,
but is intended for emergency equipment power off.
Note: Wiring from the system to the products IT controls can either be installed in conduits
or installed without conduits if the wires are in accordance with IEC/EN 60364-5-52 or
equivalent local electric code.
Caution: EPO can be achieved with either a contact closure or application of an external
24 VAC or 24 VDC from a SELV or PELV source. It is important to note that hazardous
voltage from the mains voltage must be isolated from the contact closure or 24 VAC, 24
VDC. The EPO circuit contact closure, the 24 VAC, or the 24 VDC are considered SELV
circuits as defined in EN60950 “Safety of Information Technology Equipment” or PELV
circuits as defined in IEC 60364-4-41 “Electrical Installations of Buildings Protection for
Safety—Protection Against Electric Shock.” SELV is an abbreviation for Safety Extra Low
Voltage. PELV is an abbreviation for Protective Extra Low Voltage. SELV and PELV
circuits are isolated from the mains through a safety isolating transformer, and designed so
that under isolated from the mains through a safety isolating transformer, and designed so
that under normal conditions the voltage is limited to 42.4 Vpeak or 60 VDC.
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Specifications
Electrical
Input/Output
Voltage
24 VDC
48 VDC/240 VAC (External circuit)
Current
1 A at 24 VDC
1 A at 48 VDC (External circuit)
Frequency
50/60 Hz
Circuits (qty)
9
Contact state
Normally Open (NO)
Physical
Dimensions (W×L×D)
EPO box
226 × 251×66 mm (8.9×9.9×2.6 in)
Shipping
305 × 305×140 mm (12×12×5.5 in)
Weight
EPO box
2.9 kg (6.4 lb)
Shipping
3.1 kg (6.9 lb)
Mounting
Surface mount
Connection
Removable panels in rear, 13 mm (½ in) and 6 mm (¾ in) knockouts on top and
bottom
Push button
Standard, 22 mm metallic body; 40 mm mushroom head; Push/pull
Wire connections
0.10 to 0.75 mm² (24 to 18 AWG) wire ground stud for #8 ring lug
Environmental
Temperature
–5 to 45 °C (23 to 113 °F)
Humidity
5 to 95%, non-condensing
Elevation
3000 m (10000 ft)
Compliance
Standards
NFPA 70, NFPA 75, NEC Article 645, 29 CFR 1910.36, 29 CFR 1910.306
Approvals
UL, C-UL, CE
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Overview
Emergency Power Off System
The Emergency Power Off (EPO) System consists of one or more wall-mounted, push-button EPO boxes.
Each EPO box provides a single point of equipment shutdown for up to eight APC devices and one
third-party device (such as an upstream breaker), using Normally Open (NO) contact closure connections.
An EPO box can be cascaded with other EPO boxes to support multiple points of equipment shutdown.
Note: Although the EPO is designed specifically for APC products, the system can be used
for tripping any devices that fall within its parameters. See “Specifications“ to confirm
proper application. Install the EPO according to the instructions in this manual.
EPO Box Components
1
Flag
2
Button
3
Shield
4
Knockouts
5
Mounting holes
6
Blanking panels
7
Wire anchors
8
Auxiliary device
terminal
9
Device terminal block
10
Cascading jacks
11
Wiring check points
12
Ground stud
13
Cable clamps
5
6
7
8
9
:
=
4
<
;
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Note:
Wiring, conduits, and mounting hardware are not provided.
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Installation
Prepare the EPO
1. Open the EPO System box by removing the
screws on the side. Keep the screws for use
after the system is installed. The box will not
close securely without the screws in place.
2. Mount the system in a readily-accessible area,
on a wall near the principal entrance doors,
according to NEC Articles 645.10 and 645.11,
IEC/EN 60354-5-537, or equivalent local
regulation. There are two different procedures
for mounting the system, depending on
whether you are running conduits (or cables)
along the wall or behind the wall.
Note: If not using conduits, run the cables from the connected devices or the cascaded EPO
boxes directly to the EPO using shielding troughs and cable ladders.
Mount the EPO (Running Conduits or Cables Along
the Wall)
1. Fasten four 6.35 mm (¼ in) screws through the
four mounting holes at each corner of the EPO
box and into the wall.
2. Run the conduits (or cables) for the connected
devices to the EPO box. If using conduits,
it will contain all wiring from the connected
devices and all cascading cables. The
knockouts in the top and bottom of the EPO
box accept 13 mm (½ in) and 19 mm (¾ in)
conduits or clusters of cables. Remove the
knockouts required for installation.
Note: When planning conduits
requirements, consider that two
cascading cables will fit in 13 mm
(½ in) conduits and four cascading
cables will fit in 19 mm (¾ in)
conduits. See “Cascade Multiple
EPO Boxes“ for more information.
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3. Install an appropriate fitting with a lock-nut
for each knockout used.
4. Connect conduits to the fittings.
Note: If not using conduits, run the
cables through the knockout directly.
Mount the EPO (running conduits or cables behind
the wall)
Two 120 mm (4 in) square junction boxes
One 120 mm (4 in) square junction box
One switch box up to 4-gang in size
1. Install a junction box or a switch box behind
the wall. The EPO box will fasten directly to
the box. Use one of the options above.
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2. Run the conduits (or cables) from the
connected devices to the junction or switch
box. If using conduits, it will contain all wiring
from the connected devices and all cascading
cables. Remove the knockouts required for
installation.
Note: When planning conduit
requirements, consider that two
cascading cables will fit in 13 mm
(½ in) conduits and four cascading
cables will fit in 19 mm cascading
cables will fit in 13 mm (¾ in)
conduits. See “Cascade Multiple
EPO Boxes“ for more information.
3. Install an appropriate fitting with a lock-nut
for each knockout used.
4. Connect the conduits to the fitting.
Note: If not using conduits, run the
cables through the knockout directly.
5. Remove one or both of the blanking panels
covering the window in the back of the box,
as required.
6. Secure the EPO box directly to the junction
box or switch box with the appropriate number
of 6-32 screws around the access window.
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7. Reinforce the EPO box with 6 mm (¼ in)
screws in the corner mounting holes.
Note: The top two 6 mm (¼ in)
mounting holes may be blocked by
some junction boxes. In this instance,
use only the bottom two 6 mm (¼ in)
mounting holes for reinforcement.
Connect Devices to the EPO Box
Connect APC devices to terminals 1–8. Connect an auxiliary device to terminal 9. Connect only one
0.10–0.75 mm² (24–18 AWG) wire pair to each terminal block.
1. Attach EPO circuits to each device according
to the specific instructions for that device. Use
the Normally Open (NO) contact option.
2. Run a suitable 0.10–0.75 mm² (24–18 AWG)
wire from the devices to terminals 1–8 on the
EPO box terminal block. If you are using
conduits, run the wires through the conduits to
the terminal(s). Make the connections to the
terminal block in numerical order (terminal 1,
and then terminal 2, etc.).
3. Run a suitable 0.25–0.10 mm² (22–18 AWG)
wire from the contact closure points for any
auxiliary device to terminal 9 on the EPO box
terminal block. If you are using conduits, run
the wires through the conduits to the terminal.
Note: The auxiliary circuit is rated
1A at 48 VDC/240 VAC.
4. If necessary, secure the wires inside the box
using the releasable wire ties (provided).
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5. Connect a suitable ground or PE wire to the
#8-32 ground stud in the lower left corner of
the EPO box.
Mount Additional EPO Boxes
There are two alternatives for wiring additional EPO boxes. Either cascade the boxes only to wire devices
to one box (see “Cascade Multiple EPO Boxes“), or wire devices directly to each EPO box (see “Direct
Wiring Alternative“).
Cascade Multiple EPO Boxes
When cascading EPO boxes, connect a wire pair from each device to the first EPO box according to the
procedure in “Connect Devices to the EPO Box“. Jumper the subsequent EPO boxes with cascading
cables (standard CAT-5 cable)— this procedure will join the EPO boxes in parallel.
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APC
APC
APC
APC
APC
APC
APC
APC
Note: The recommended maximum total distance of wire, to run per circuit is 300 m
(1000 ft).
Cascade the APC Devices with CAT-5 Cables
Connect the CAT-5 cables to the jacks inside the EPO box. Each cable can support up to four APC device
wire pairs. Follow these guidelines when connecting CAT-5 cables:
• Use only the bottom jacks (3 and 4) if cascading
four (4) or fewer devices.
Output
1
• Use both the bottom and the top jacks (1, 2, 3
and 4) if cascading five (5) or more devices.
• Connect the output jacks (1 and 3) of the first
EPO box to the input jacks (2 and 4) of the
second EPO box.
• Continue until all boxes are connected.
Box 2
Box 1
Input
2
EPO – 8
5
PAIRS
EPO
PAIRS
5
–8
EPO – 4
1
PAIRS
EPO
PAIRS
1
–4
3
4
• If necessary, use the white cable clamps to
secure the CAT-5 cables.
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Cascade the Auxiliary Device with Wire Pairs
1. After wires are run from auxiliary device (1)
to terminal block position 9, run a second set
of wires (2) from terminal block position 9 on
the first EPO box to terminal block position 9
on the second EPO box.
1
2. Continue until all boxes are connected. (See
2
the diagram in “Cascade Multiple EPO
Boxes“ for reference.)
Direct Wiring Alternative
If the APC devices are centrally located between exit doors, it may be more practical to run separate wire
pairs from the devices to each EPO box. This wiring method requires terminal block connections in every
EPO box, rather than cascading cables between boxes. Connect wire pairs from the Normally Open (NO)
contacts on the devices to each EPO box. Because this alternative results in multiple wire pairs at the
terminals of the devices, APC does not recommend using it with more than three EPO boxes.
APC
Device
APC
Device
APC
Device
EPO Box 1
Auxiliary
Non-InfraStruXur e
Breaker
EPO Box 2
Verify Connections at each EPO Box
1. Verify that the wiring is correct before attaching critical load devices to your devices:
A. With the devices powered ON, use a small tool to press each check point, one at a time.
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Note: If an APC FM Series Precision Air Conditioning System connected to the EPO box,
pressing the check point will shut off functionality to the unit, but the unit will still be
powered.
B. After verifying the wiring, close the system box, making sure not to pin wires or disturb
connections, and secure with the screws, previously removed when opening the box.
C. As a final test, apply power to all APC devices and auxiliary devices, and press the EPO
button. All connected devices should power OFF immediately. Repeat this final test at every
EPO box in the system.
WARNING: Pressing the check point will shut down the connected device and any
load it is supporting.
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Operation
Engage the System
1. Lift the shield on any of the installed EPO
boxes and press the button. A red flag will
drop down from the box, providing an easy
visual mark as to which EPO box in your room
has been activated.
Reset the EPO System
1. Pull the button towards you (1) and push the
flag up until it catches (2). Pulling the button
does not bring power back to the connected
equipment; it only resets the EPO system.
Close the shield after resetting the system.
2
1
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Reset the Equipment
Apply power to the devices according to the procedures for each device.
Note: Refer to the operation manual included with each device for specific instructions on
how to apply power to the device.
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Wiring Diagram
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Worldwide Customer Support
Customer support is available at no charge via e-mail or telephone. Contact information is available at
www.apc.com/support/contact
© Schneider Electric. APC and the APC logo are owned by Schneider Electric Industries S.A.S. or
their affiliated companies. All other trademarks are property of their respective owners.
990–1611C-001
12/2012
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