APC PM3 User Manual download pdf (Page 8)

Parallel Connection

When making a parallel type of connection (Figure 2), the length of the wiring to the Surge Protection Device (SPD)

must be kept as short as possible to substantially enhance the performance. Long wire runs are to be avoided for the

unit to perform as intended.

To reduce the impedance the wire displays to surge currents, the phase, neutral (if used), and ground conductors are to

be routed within the same conduit and should be tightly bundled or twisted together to optimize performance of the

unit. Sharp bends in the conductors are to be avoided.

Wire Size

With a parallel connection, the size of the wiring to the SPD is independent of the ampere rating of the circuit to be

protected. The recommended wire size is based on the unit’s transient surge current capabilities. #6 AWG is the rec-

ommended wire size for phase, neutral, and ground.

**Surge Protection Devices are designed for use on the load side

of the service entrance disconnect only**

PM SERIES INSTALLATION INSTRUCTIONS

Typical Unit Installation - Three Phase WYE, 4 Wire, plus Ground

This section provides basic installation instructions for the PM3 SPD. Per UL 1449 Paragraph 1.4, SPDs "are

intended for installation on the load side of the main overcurrent protection". Locate the SPD as close as possible to

the circuit to be protected to minimize the wire length. This will optimize SPD performance.

Note that these instructions are not intended to supercede local or national codes. The installation should be per-

formed by a licensed electrician. To install a PM3 SPD, refer to Figure 3 and proceed as follows:

1. Unpack and inspect the unit for signs of damage. If the unit is damaged, contact APC Customer Service (at 1-800-

800-4APC). See Page 14 for obtaining service under the Warranty.

2. Locate where the SPD will be installed. Ensure the wire lengths from the SPD to the service panel are kept to a

minimum.

3. Carefully remove the front cover by loosening the four (4) captive screws that secure the front cover to the chassis.

Insure the ribbon cables attached to the diagnostic faceplate are not mechanically stressed or become unplugged.

DO NOT ALLOW THE DIAGNOSTIC FACEPLATE TO HANG BY THE RIBBON CABLES!

4. Two holes are provided for the installation of wiring. The unit is shipped with a three (3) piece plug for use in

plugging the unused hole. If the desired hole is plugged, remove the plug by removing the wing nut along with the

inner and outer plug pieces.

5. In order to keep wiring length and bend radii at a minimum, APC recommends that wiring be installed through the

left side of the SPD. APC also recommends that the hole be sealed with putty after wiring installation.

6. Drill four (4) pilot holes (mounting holes in the SPD are 5/16" in diameter) to provide for mounting of the SPD.

Page 5

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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.

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APC PM3 User Manual Page 8