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9
IO-70064
05/2020
ASCO 460/465/480/485 Surge Protective Device (SPD)
Grounding
General
Solidly-Grounded
Power Systems
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
• Connect the Surge Protective Device ground terminal to the building
grounding grid structure.
• Use an appropriately sized equipment grounding conductor.
• When using metallic raceway or conduit:
– Do not use isolated bushings to interrupt the metallic raceway or
conduit.
– Maintain electrical continuity at all raceway and conduit connections
using appropriate bonding devices.
• Do not use a separate isolated ground for the ASCO 460/465/480/485
Surge Protective Device.
• Verify proper equipment connection to the grounding system.
• Verify ground grid continuity by performing regularly scheduled
inspections and testing as part of a comprehensive electrical
maintenance program.
Failure to follow these instructions will result in death or serious injury.
The ASCO 460/465/480/485 has SPD elements connected from phase
to ground. It is critical that there be a robust and effective connection to
the building grounding structure. The grounding connection must utilize an
equipment grounding conductor run with the phase and neutral (if present)
connection of the power system.
For proper over-voltage suppression by the ASCO 460/465/480/485 SPD, use
a single-point ground system where the service entrance grounding electrode
system is connected to, and bonded to, all other available electrodes, building
steel, metal water pipes, driven rods, etc. (for reference, see IEEE 142-2007).
The ground impedance measurement of the electrical system must be as low
as possible, and in compliance with all applicable codes.
Grounding
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
• Do not connect devices rated for use on solidly-grounded power sys-
tems to resistance-grounded (for example, High Resistance Ground) or
ungrounded power systems.
• Verify that the service entrance equipment is bonded to ground in accor-
dance with all applicable codes.
• Verify that the neutral terminal of the power system transformer feeding
the device is bonded to system ground in accordance with all applicable
codes.
Failure to follow these instructions will result in death or serious injury.
SPDs rated for use on solidly-grounded power systems must not be
connected to resistance-grounded or ungrounded power systems. Such a
connection can result in damage to the SPD.
Always verify the power system grounding configuration prior to application
of power to the device. Confirm that all ground bonds are installed at both
the service entrance equipment and power system transformer prior to
application of power.
DANGER
DANGER
