Maintaining Safety With Electricity - Cisco Catalyst 9400 Series Hardware Installation Manual

Maintaining Safety with Electricity

Environment
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.
Note In all situations, grounding practices must comply with Section 250 of the National Electric Code (NEC)
requirements or local laws and regulations. A 6 AWG grounding wire is preferred from the chassis to the rack
ground or directly to the common bonding network (CBN). The equipment rack should also be connected to
the CBN with a 6 AWG grounding wire.
Note Always ensure that all of the modules are completely installed and that the captive installation screws are
fully tightened. In addition, ensure that all the I/O cables and power cords are properly seated. These practices
are normal installation practices and must be followed in all installations.
Maintaining Safety with Electricity
When working on electrical equipment, follow these guidelines:
• Do not work alone if potentially hazardous conditions exist anywhere in your work space.
• Never assume that power is disconnected from a circuit; always check the circuit before working on it.
Cisco Catalyst 9400 Series Switches Hardware Installation Guide
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Electromagnetic Noise Grounding Recommendations
Severity Level
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.
Preparing for Installation