Cisco CATALYST 6509E 9 SLOT 15U CHASSIS NO POWER SUPPLY NO FAN TRAY Specification Guide

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. 

You must use the system (NEBS) ground on both AC- and DC-powered systems if you are installing 
Foreign Exchange Station (FXS) modules or if you are installing this equipment in a U.S. or European 
Central Office.

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:

You must install the system (NEBS) ground connection with any other rack or system power ground 
connections that you make. The system 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.

The system (NEBS) ground serves as the primary safety ground for the Catalyst 6503 and 
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.

To connect the system ground, you need the following tools and materials:

Grounding lug—A two holes standard barrel lug. Supports up to 6 AWG wire. Supplied as part of 
accessory kit.

Grounding screws—Two M4 x 8mm (metric) pan-head screws. Supplied as part of the accessory kit.

Grounding wire—Not supplied as part of accessory kit. The grounding wire should be sized 
according to local and national installation requirements. Depending on the power supply and 
system, a 12 AWG to 6 AWG copper conductor is required for U.S. installations. Commercially 
available 6 AWG wire is recommended. The length of the grounding wire depends on the proximity 
of the switch to proper grounding facilities. 

No. 1 Phillips screwdriver.

Crimping tool to crimp the grounding wire to the grounding lug.

Wire-stripping tool to remove the insulation from the grounding wire.