Establishing The System Ground - Cisco 6503 - Catalyst Firewall Security Sys Installation Manual

Establishing the System Ground

Establishing the System Ground
This section describes how to connect a system ground to the Catalyst 6500 series switches.
This system ground is also referred to as the network equipment building system (NEBS) ground.
Note
Installations that rely solely on system grounding using only an AC third-prong ground run a
Caution
substantially greater risk of equipment problems and data corruption than those installations that use
both the AC third-prong ground and a properly installed system (NEBS compliant) ground.
The system (NEBS) ground provides additional grounding for EMI shielding requirements and
grounding for the low voltage supplies (DC-DC converters) on the modules and is intended to satisfy the
Telcordia Technologies NEBS requirements for supplemental bonding and grounding connections. You
must observe the following system grounding guidelines for your chassis:
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In all situations, grounding practices must comply with Section 250 of the National Electric Code (NEC)
Note
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.
The system (NEBS) ground serves as the primary safety ground for the Catalyst 6503 and
Note
Catalyst 6503-E chassis that are equipped with DC-input power supplies. The DC-input power supplies
for these chassis do not have a separate ground.
Catalyst 6500 Series Switches Installation Guide
3-52
You must install the system (NEBS) ground connection with any other rack or system power ground
connections that you make. The system (NEBS) ground connection is required if FXS modules are
installed or if this equipment is installed in a U.S. or European Central Office.
You must connect both the system (NEBS) ground connection and the power supply ground
connection to an earth ground. The system (NEBS) ground connection is required if FXS modules
are installed or if this equipment is installed in a U.S. or European Central Office.
For Catalyst 6503 or Catalyst 6503-E chassis that are equipped with DC-input power supplies, you
must install the system (NEBS) ground before you attach the source DC power cables to the DC
PEM. If the Catalyst 6503 or Catalyst 6503-E chassis is powered up, you must power down the
chassis before attaching the system (NEBS) ground. If you are installing the system (NEBS) ground
on other models of the Catalyst 6500 series chassis that are equipped with either AC-input or
DC-input power supplies, you do not need to power down the chassis.
If you are installing the 8700 W AC-input power supply on a Catalyst 6506, Catalyst 6509, or on a
Catalyst 6509-NEB chassis, you must install the system ground (NEBS ground) on the power supply
rather than on the switch chassis. The extended depth of the 8700 W power supply blocks access to
the system ground pad on those chassis. There are two ground posts located on the power supply
faceplate where the system ground connection can be made.
Chapter 3 Installing the Switch
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