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10
IO-70075
08/2020
Location of Surge Protective
Device (SPD)
To load(s)
Phases
Neutral
Ground
Ground bus
Neutral bus
SPD
Phase A
Phase B
Phase C
Neutral
Ground
Panel
Interconnect wiring
– Minimize length
– Avoid sharp bends
ASCO 450/451/452/453 Surge Protective Device (SPD)
Grounding
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 wire impedance
from surge currents, the phase, neutral, and ground conductors 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 1.
Figure 1:
SPD Wiring for Wye and High-Leg Delta Configurations
Figure 2:
SPD Wiring for Delta Configurations
To load(s)
Phases
Ground
Phase A
Phase B
Phase C
Ground
SPD
Interconnect wiring
– Minimize length
– Avoid sharp bends