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2-20
Cisco MDS 9200 Series Hardware Installation Guide
OL-17468-02
Chapter 2 Installing the Cisco MDS 9200 Series
System Grounding
Table 2-2 Grounding Best Practices
Environment
Electromagnetic Noise Severity
Level Grounding Recommendations
Commercial building is
subjected to direct lightning
strikes.
For example, some places in the
United States, such as Florida,
are subject to more lightning
strikes than other areas.
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.
Commercial building is located
in an area where lightning
storms frequently occur but is
not subject to direct lightning
strikes.
High Best grounding practices must
be closely followed.
Commercial building contains a
mix of information technology
equipment and industrial
equipment, such as welding.
Medium to high Best grounding practices must
be closely followed.
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.
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.
New commercial building is not
subject to natural environmental
noise or man-made industrial
noise. This building contains a
standard office environment.
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.
Existing commercial building is
not subject to natural
environmental noise or
man-made industrial noise. This
building contains a standard
office environment.
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.