Cisco Catalyst 9200 Series Hardware Installation Manual page 35

Preparing for Installation
Table 9: Grounding Practice Guidelines
Environment
Commercial 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.
Commercial building is located in an
area where lightning storms occur
frequently, but is not prone to direct
lightning strikes.
Commercial building contains a mix
of information technology equipment
and industrial equipment, such as
welding.
Existing 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.
New commercial building is not subject
to natural environmental noise or
man-made industrial noise. This
building contains a standard office
environment.
Existing commercial building is not
subject to natural environmental noise
or man-made industrial noise. This
building contains a standard office
environment.
Electromagnetic Noise Grounding Recommendations
Severity Level
High 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 codes. Best
grounding practices must be closely
followed.
High Best grounding practices must be closely
followed.
Medium to High Best grounding practices must be closely
followed.
Medium 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.
Low 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.
Low 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.
Cisco Catalyst 9200 Series Switches Hardware Installation Guide
System Grounding
27