Cisco CRS-1 - Manual (Page 24)

2-4
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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