User Manual

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Cisco CRS Carrier Routing System 8-Slot Line Card Chassis Site Planning Guide

OL-5802-09

Chapter 2 Power and Cooling

Bonding and Grounding Guidelines

Figure 2-1 NEBS Bonding and Grounding Points (Rear of Chassis) - Fixed Configuration AC

Power Shown

To connect the chassis to a NEBS-compliant bonding and grounding system at your site, you must have

the following:

• One grounding lug that has two M6 bolt holes with 0.625 inches (15.86 mm) spacing between them,

and a wire receptacle large enough to accept a 6-AWG or larger multistrand copper wire. The lug is

similar to the straight type used for the DC-input power, as shown in Figure 2-5 on page 2-9.

• Four M6 or equivalent hex-head nuts with integrated locking washers are shipped pre-installed on

the inside of the chassis.

• Eight M6 or equivalent hex-head bolts with integrated locking washers are shipped pre-installed on

the outside of the chassis.

Note The chassis ground wire connectors have a torque value of 30 in.-lb (3.39 N-m).

• Grounding wire. Although we recommend at least 6-AWG multistrand copper wire, the actual wire

diameter and length depend on your router location and site environment. This wire is not available

from Cisco Systems; it is available from any commercial cable vendor. The wire should be sized

according to local and national installation requirements.

Caution The DC Return of the Cisco CRS 8-slot chassis should remain isolated from the system frame and

chassis (DC-I: Isolated DC Return).

For additional information about NEBS, see Cisco CRS Carrier Routing System Regulatory Compliance

and Safety Information.

1 NEBS bonding and grounding points (inside chassis)

2 NEBS bonding and grounding points (outside chassis)

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