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For troubleshooting, call technical assistance at 1-800-237-4567 or [email protected]
11
IO-70075
08/2020
General
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 450/451/452/453
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 450/451/452/453 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 450/451/452/453 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 should be as low as possible, and in compliance with all applicable
codes.
Grounding
DANGER
ASCO 450/451/452/453 Surge Protective Device (SPD)
Grounding
