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Catalyst 4948E and Catalyst 4948E-F Switch Installation Guide
OL-21561-02
Chapter 2 Preparing for Installation
System Grounding
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 6 AWG grounding wire.
Caution Category 5e, Category 6, and Category 6a cables can store large levels of static electricity because of the
dielectric properties of the materials used in their construction. Always ground the cables (especially in
new cable runs) to a suitable and safe earth ground before connecting them to the port on the switch.
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.
• Look carefully for possible hazards in your work area, such as damp floors, ungrounded power
extension cables, frayed or damaged power cords, and missing safety grounds.
• If an electrical accident occurs, proceed as follows:
–
Use extreme caution; do not become a victim yourself.
–
Disconnect power from the system.
–
If possible, send another person to get medical aid. Otherwise assess the condition of the victim,
and then call for help.
–
Determine if the person needs rescue breathing or external cardiac compressions; then take
appropriate action.
• Use the product within its marked electrical ratings and product usage instructions.
• Install the product in compliance with local and national electrical codes.
New commercial building is not
subject to natural environmental
noise or man-made industrial
noise. This building contains a
standard office environment.
Low Grounding best 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 Grounding best practices should be followed
as much as possible. Electromagnetic noise
problems are not anticipated, but installing a
best practice grounding system is always
recommended.
Table 2-1 Grounding Practice Guidelines (continued)
Environment Electromagnetic
Noise Severity Level
Grounding Recommendations