3. Open the door on the unit by loosening the two screws that secure the door latches in place. Slide the top latch
upward and rotate it so that it no longer secures the door. Slide the bottom latch downward and rotate it so that it
no longer secures the door.
4. Drill a hole large enough to allow for the installation of the correct sized UL approved conduit with anti-short
bushings (not supplied) to accomodate the wiring being installed. NOTE: In order to keep wiring length and bend
radii at a minimum, APC recommends that wiring be installed through the left side or bottom of the SPD. APC
also recommends that the hole be sealed with putty after wiring installation.
5. Drill four (4) pilot holes (mounting holes in the SPD are 5/16" in diameter) to provide for mounting of the SPD.
6. Mount the device via the flanges as close as possible to the panel being protected.
7. Connect the unit to the service panel through the UL approved conduit with anti-short bushings. The connecting
wires should be twisted together or tightly bundled and kept as short as possible to enhance the performance of the
SPD. Terminal wire size range is #8 AWG to #1 AWG. Torque screws to 65 inch-pounds. The recommended wire
size for phase, neutral, and ground is #6 AWG.
Connect a wire (in conduit) to the safety ground bus of the distribution panel, and to the ground connection of the
SPD as shown in the diagram on the following page, and as marked on the unit. Proper grounding is essential, use
a green wire or yellow/green striped wire for the ground connection. Connect a wire (in conduit) to the NEUTRAL
bus of the panel and to the NEUTRAL connector of the SPD as marked on the unit. Use a white wire or mark with
a white band for the neutral connection.
Connect a wire (in conduit) to each phase (HOT) feed on the LOAD side of the three-pole breaker. Be sure the
breaker is turned OFF prior to making any connections of any kind. If a breaker is not available, then it will be nec-
essary to install or connect to an existing main disconnect switch (on the LOAD side). Disconnect switches are
available from APC as an option and must be specified at the time of purchase; the disconnect is not an "add-on"
device and may change the size of the enclosure. Be sure the disconnect switch is open (OFF) and the power is
secured before making any connections. Refer to the diagram on the following page and the markings on the unit
when connecting the phase wires.
For answers to questions about installation, call APC’s Customer Service Department at: 800-800-4APC.
**Always Install the SPD on the LOAD side of the main disconnect**
After all connections have been made and no hazards exist, restore power to the panel, breaker, or disconnect
switch as required. If the SPD is installed and functioning properly, the green LED indicators on the front panel
display will be lit, the module LED indicators will be lit, and there will be no audible or visual alarms.
Page 6
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All electrical connections should be performed by a qualified (licensed) electrician. All wiring
must comply with the National Electric Code (NEC) and applicable local codes.
