10
SpikeShield
®
Non-Modular Surge Protective Device (SPD)
GROUNDING
Hubbell Wiring Devices
1-800-729-3406 | www.Hubbell-Wiring.com
Electrical equipment should be installed, operated, serviced, and maintained only by qualified personnel.
No responsibility is assumed by Hubbell for any consequences arising out of the use of this material.
Grounding
The SPD product has leakage current to ground when energized and can
present a hazardous touch voltage.
The device has SPD components connected from phase to ground. To
prevent hazardous touch voltage on the SPD enclosure during normal
operation or during SPD end-of-life, 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. The SPD
should not be connected to a separate isolated ground.
When metallic raceway is used as the wiring method, an insulated
grounding conductor should be run inside the raceway and sized in
accordance with all applicable codes. Maintain electrical continuity at all
raceway connections using appropriate bonding devices and do not install
isolating bushings to interrupt a metallic raceway run.
For best overvoltage suppression by the 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.
SPD rated for use on solidly-grounded power systems must not be
connected to resistance-grounded (for example HRG) or ungrounded power
systems. Such a connection can result in damage to the components within
the SPD product.
WARNING
HAZARDOUS TOUCH VOLTAGE
• Connect the SPD ground terminal to the building grounding grid
structure.
• Use an appropriately sized equipment grounding conductor.
• When using metallic raceway or conduit:
— Do not use the SPD ground unless augmented with an insulated
equipment grounding conductor installed inside the 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 SPD.
• 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 can result in death or serious injury.