Installation and Operation Manual 11
System Grounding
An equipment grounding conductor must be used on all electrical circuits
connected to the SPD. For the best performance, 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, for sensitive
electronics and computer systems.
When a metallic raceway is used as an additional grounding conductor, an
insulated grounding conductor should be run inside the raceway and sized
in accordance with all applicable codes.
LOSS OF SURGE PROTECTION
• Must be installed on solidly grounded power systems. Do not use on
ungrounded systems.
• Verify that the service entrance equipment is bonded to ground in
accordance with all applicable codes.
• Verify that the neutral terminals are grounded to system ground in
accordance with all applicable codes.
Failure to follow these instructions can result in equipment damage.
WARNING
INADEQUATE RACEWAY ELECTRICAL CONTINUITY
• Ground impedance must be as low as possible and in compliance with
all applicable codes for sensitive electronic and computer systems.
• Install an insulated grounding conductor inside a metallic raceway when
the raceway is used as an additional grounding conductor. Size the
conductor in accordance with all applicable codes.
• Maintain adequate electrical continuity at all raceway connections.
• Do not use isolating bushings to interrupt a metallic raceway run.
• Do not use a separate isolated ground for the SPD.
• Verify proper equipment connections to the grounding system.
• Verify ground grid continuity by inspections and testing as part of a
comprehensive electrical maintenance program.
Failure to follow these instructions can result in death or serious injury.
Grounding
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