Table 12: Grounding Practice Guidelines
Grounding RecommendationsElectromagnetic Noise
Severity Level
Environment
All lightning protection devices must be
installed in strict accordance with
manufacturer recommendations.
Conductors carrying lightning current
should be spaced away from power and
data lines in accordance with applicable
recommendations and building codes. Best
grounding practices must be closely
followed.
HighCommercial building is subjected to
direct lightning strikes.
For example, some places in the United
States, such as Florida, are prone to
more lightning strikes than other areas.
Best grounding practices must be closely
followed.
HighCommercial building is located in an
area where lightning storms occur
frequently, but is not prone to direct
lightning strikes.
Best grounding practices must be closely
followed.
Medium to HighCommercial building contains a mix
of information technology equipment
and industrial equipment, such as
welding.
Best grounding practices must be closely
followed. Determine source and cause of
noise if possible, and mitigate as closely as
possible at the noise source or reduce
coupling from the noise source to the
victim equipment.
MediumExisting commercial building is not
subject to natural environmental noise
or man-made industrial noise. This
building contains a standard office
environment. This installation has a
history of malfunction due to
electromagnetic noise.
Best grounding practices should be
followed as closely as possible.
Electromagnetic noise problems are not
anticipated, but installing a best-practice
grounding system in a new building is often
the least expensive route, and the best way
to plan for the future.
LowNew commercial building is not subject
to natural environmental noise or
man-made industrial noise. This
building contains a standard office
environment.
Best grounding practices should be
followed as much as possible.
Electromagnetic noise problems are not
anticipated, but installing a best-practice
grounding system is always recommended.
LowExisting commercial building is not
subject to natural environmental noise
or man-made industrial noise. This
building contains a standard office
environment.
Cisco Catalyst 9500 Series Switches Hardware Installation Guide
32
Preparing for Installation
System Grounding
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