APC PMG2X-A Manual download pdf (Page 10)

Installation and Operation Manual

Location of Surge Protective

Device (SPD)

Install SPDs on the load side of the main overcurrent protection to comply

with NEC

Article 285 for Type 2 SPD.

Locate the SPD as close as possible to the circuit being addressed to

minimize the wire length and optimize SPD performance. Avoid long wire

runs so that the device will perform as intended. To reduce the impedance

that the wire displays to surge currents, the phase, neutral, and ground

conductors (wye and high-leg delta configurations), or phase conductors

(delta configurations), must be routed within the same conduit and tightly

bundled or twisted together to optimize device performance. Avoid sharp

bends in the conductors. See Figure 2.

Figure 2: SPD Wiring for Wye and High-Leg

Delta Configurations

Phases

Neutral

Ground

Neutral bus

Ground bus

Panel

Phase A

Phase B

Phase C

Neutral

Ground

Interconnect wiring

— Minimize length

—Avoid sharp bends

SPD

To load(s)

Electrical

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APC PMG2X-A Manual Page 10