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8
IO-70064
05/2020
ASCO 460/465/480/485 Surge Protective Device (SPD)
Electrical
Terminals, Wire Size, and
Installation Torque
Location of Surge Protective
Device (SPD)
Branch Circuit Overcurrent
Protection
Terminals are provided for phase (line), neutral, and equipment ground
connections. When equipped with a disconnect switch the 460/465/480/485
terminals accept a range of 8 AWG to 1/0 AWG copper wire. For units
installed without a disconnect switch terminals will accept 10 AWG to 2 AWG
copper wire
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
• Use conductors rated for the Overcurrent Protection Device (OCPD) per
applicable codes.
• Use conductors rated for the application per applicable codes.
Failure to follow these instructions will result in death or serious injury.
UL 1449 Type 1 SPDs have been designed and approved for line side appli-
cations prior to the main service disconnect without supplemental overcur-
rent protection. Type 1 SPDs may also be installed on the load side of the
main Overcurrent Protection Device (OCPD).
Locate the SPD as close as possible to the circuit being addressed to min-
imize 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:
Surge Protective Device Wiring Practice
DANGER
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
Table 2:
Terminal Torque
Connection Torque
Power Connection
Torque
AØ, BØ, CØ, N and Ground
40-50 lb-in. (4.5 - 5.6 N•m)