Legrand PA120Y User Manual

Legrand/Wiremold electrical systems conform to and should be
properly grounded in compliance with requirements of the current
National Electrical Code or codes administered by local authorities.

All electrical products may present a possible shock or fire
hazard if improperly installed or used. Legrand/Wiremold electrical
products may bear the mark of a Nationally Recognized Testing
Laboratory (NRTL) and should be installed in conformance with current
local and/or the National Electrical Code.

PA/PB Series

Hard Wired Surge Protectors

I N S T A L L A T I O N I N S T R U C T I O N S

Installation Instruction No.: 1 007 593R1 – Updated November 2009

A and PB Series Surge Protection Devices (SPD) from Legrand/Wiremold are designed for use at the service entrance,

P
distribution or branch panel, or at sensitive equipment. Units with an “-A” suffix include remote monitoring contacts; units with
a "-B" suffix include a noise filter. Units with suffix “-AB” include both remote monitoring contacts and noise filter options.

CAUTION

• Installation should be performed by a qualified electrician.

• Read all instructions prior to installing this device.

• TO AVOID FIRE, SHOCK, SERIOUS INJURY OR DEATH, TURN OFF POWER TO ELECTRICAL PANEL AND

EQUIPMENT TO BE PROTECTED PRIOR TO INSTALLATION OF THE SURGE PROTECTOR.

• PA and PB Series Surge Protection Devices are not lightning arrestors. They are not designed to
provide protection against direct lightning strikes or against a sustained overvoltage condition.

IMPORTANT: Please read all instructions

before beginning.

PREPARATION

The following tools are required to mount and install the
surge protector:

1. Electric Drill

2. Hole Saw (1 1/8" [29mm] typical) or other knockout
device. (Or use pre-punched knockout on electrical panel.)

3 Wire cutter stripper for #10 AWG wire.

4. Miscellaneous hand tools.

1. Test and check system voltage to verify proper surge protector selection. TURN OFF POWER TO ELECTRICAL PANEL.

2. Remove the cover from the electrical panel.

3. The SPD must be connected through a dedicated circuit breaker or fused disconnect switch. The breaker (or disconnect
switch) will provide a means of removing power to the unit for maintenance.

Use a 30 amp circuit breaker with an interrupt rating of at least 5,000A RMS, or fused disconnect switch (customer supplied).

Use a three pole breaker for three phase systems, a two pole breaker for 120/240V systems when configuring for
240V, two phase, and a single pole breaker when configuring a 120/240V unit for 120V single phase.

NOTE: Locate the SPD as close to the breaker as possible in order to minimize the connection length between

the panel power lines and the SPD.

4. Unscrew the four (4) nuts on the front of the unit and set them aside. Carefully remove the lid of the SPD; note that the
circuit board is attached. Place the lid with attached board in a safe location where it will not be exposed to dirt,
dust or physical impact.

The following materials are required to mount and install the
surge protector:

1. Nipple (1" [25mm]) close metallic nipple for typical
installations.

2. Connecting wire: #10 AWG stranded.

3. Fasteners appropriate for the wall type where the SPD is
to be mounted. (Unit features built-in mounting holes,
11/64" [4.4mm] diameter.)

5. Determine the desired location for the SPD. The figure at right
illustrates potential locations for the SPD relative to the panel.
Hold the SPD case to the panel box and mark the location
of the knockout on the SPD case. Make a knockout in the
electrical panel where the SPD is to be installed.

The knockout should be as close to the breaker feeding
the SPD as possible.

SPD

PANEL

6. Using a hole saw (or knockout device), cut a hole in the SPD
enclosure at the entrance location. The upper edge of the hole

must not exceed 1.3" from the mountable bottom of the SPD
enclosure (see figure at right). Duct hole location must be
centered to the side chosen. Remove any dust, residue and/or

burrs from the SPD housing after making the knockout.

DUCT HOLE

LOCATION

1.3"

[33MM]

SPD

SPD

SPD

COVER

BASE

7. Put the connecting nipple into the empty SPD enclosure using the appropriate lock nuts and bushing.

8. Connect the SPD enclosure to the electrical panel by placing the nipple into the knockout hole in the panel using the
appropriate lock nuts and bushing.

9. Mount the SPD securely using the pre-punched mounting holes and the necessary hardware based on the composition
of the wall.

10. Cut the connecting wire to the appropriate lengths. (Reminder: use maximum #10 AWG stranded connecting wire.)
Connect the SPD terminals to the load side of the circuit breaker in the panel according to the wiring instructions in this
manual. The circuit breaker must be in the OFF position. Run the appropriate conductors from the overcurrent device
in the panel, through the nipple into the SPD unit.

11. Terminate the wires to the appropriate terminal lugs in the SPD. Be careful to connect the wires to the appropriate
standoff following circuit board annotations for phase and reference potentials. The recommended torque for
tightening the terminal lugs to the wire is 25 pounds.