Cisco CRS-1 Site Planning Manual page 27

Chapter 2 Power and Cooling
Note
An earth ground cable is required for each fixed configuration DC PDU. We recommend that you
•
use at least 6-AWG multistrand copper wire. This wire is not available from Cisco Systems; it is
available from commercial cable vendors.
The ground wire cable lug should be dual-hole, as shown in
terminal studs at 0.625-inch (15.88-mm) centers (for example, Panduit part number LCD6-14A-L
or equivalent).
Figure 2-3
End View
0.48
0.08
Figure 2-4
Figure 2-4
1 Each set of cables (RTN and –48V/–60V) is a single VDC input.
OL-5802-09
DC input power cables must be connected to the PDU terminal studs in the proper positive
(+) and negative (–) polarity. In some cases, the DC cable leads are labeled, which is a
relatively safe indication of the polarity. However, you must verify the polarity by measuring
the voltage between the DC cable leads. When making the measurement, the positive (+)
lead and the negative (–) lead must always match the (+) and (–) labels on the PDU.
DC Earth Ground Cable Lug
Ø 0.267
2 holes
0.25 0.63
shows the DC input power cables connected to the DC PDU terminal studs.
Fixed Configuration DC PDU Power Cable Connections
1
Cisco CRS Carrier Routing System 8-Slot Line Card Chassis Site Planning Guide
All measurements in inches
2.24
Crimp area
0.37
DC Power Systems
Figure 2-3, and able to fit over M6
2-7