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Installation and Operation

Owner’s Manual for Surge Protection Device 5

Section 3: Installation and Operation

Introduction to Installation

This section describes how to install a Surge Protection

Device (SPD) in parallel (shunt) across the AC supply of

a split phase electrical system.

Installation

Refer to the label on the SPD to verify the voltage rating

and wiring configuration of the SPD matches that of the

electrical system. Use an AC voltmeter to measure the

system line voltage to verify the correct model of SPD is

being installed. Damage to the SPD may result if it is

connected to an electrical system of a higher voltage or

different wiring configuration.

Mounting

The SPD can be mounted directly to the electrical panel:

• Choose a mounting location for the SPD that

provides the shortest and straightest possible

wiring (lead length) from the SPD to the electrical

system connections. Excessive lead length and

sharp bends will degrade SPD performance.

• If the electrical system uses an isolated ground, the

SPD must be isolated from ground using insulated

conduit fittings.

• See Figure 3-2. When using conduit, avoid using

90° elbows (A) and keep the conduit run as short

and straight as possible (B).

Conduit Installation

See Figure 3-1. Mount the SPD directly to the electrical

panel using a 1/2 in. locknut.

Figure 3-1. 1/2 in. Locknut Mounting

See Figure 3-2. When mounting the SPD outdoors, use

weatherproof conduit and fittings to maintain the

enclosure’s NEMA 4 rating.

Figure 3-2. Conduit Installation

Wiring

When installing wiring:

• Follow all national, state, and local electrical codes

when making wiring connections.

• When connecting the wires from the SPD to the

electrical system, cut the wires as necessary to

keep them as short as possible.

• To maximize the SPD’s performance, twist and

bind the wires together to reduce the impedance of

the wire (one twist/inch).

• If the system utilizes an isolated ground, the SPD’s

ground wire must be connected to the system’s

isolated ground bus.

1. See Figure 3-3. Connect the SPD’s neutral wire

(white) to the system’s neutral connection.

2. Connect the SPD’s phase A and B wires (black) to

the system’s corresponding phase A and B

connections according to applicable national, state,

and local electrical codes.

Figure 3-3. Split Phase Wiring Diagram

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