Cisco Systems CRS-1 manual Supplemental Bonding and Grounding, Compliance and Safety Information

Chapter 2 Power and Cooling

Supplemental Bonding and Grounding

Supplemental Bonding and Grounding

The 8-slot line card chassis has a safety earth ground connection as part of the power cabling to the PDUs. The chassis also has supplemental bonding and grounding points (two threaded ground inserts) that you can use to connect the router to the central office ground system or interior equipment grounding system. Also referred to as the network equipment building system (NEBS) bonding and grounding stud, these grounding points are located at the rear (MSC side) of the chassis (see Figure 2-8).

Note The NEBS bonding and grounding points are intended to satisfy the Telcordia NEBS requirements for supplemental bonding and grounding connections. If you are not installing the router in a NEBS environment, you can skip these guidelines and rely on the safety earth ground connection for the PDUs.

Figure 2-8 NEBS Bonding and Grounding Points (Rear of Chassis)

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NEBS bonding and grounding points

To connect the chassis to a supplemental ground connection, you must have the following:

•A grounding lug that has two M6 bolt holes with 0.625- to 0.75-inch (15.86- to 19.05-mm) spacing between them, and a wire receptacle large enough to accept a 6-AWG or larger multistrand copper wire. The lug is not available from Cisco Systems; it is available from electrical-connector vendors.

•Two M6 or equivalent hex-head bolts with locking washers and nuts (nickel-plated brass is ideal). These bolts, locking washers, and nuts are not available from Cisco Systems; they are available from any commercial hardware vendor.

•A 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.

Caution The DC Return of the Cisco CRS-1 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-1 Carrier Routing System Regulatory

Compliance and Safety Information.

Cisco CRS-1 Carrier Routing System 8-Slot Line Card Chassis Site Planning Guide

OL-5802-06 2-9