Dell PowerEdge Rack Enclosure 4820 - Manual (Page 5)

Cable Routing Procedures for Dell PowerEdge R720/R720xd Systems
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1.2. Routing the power cables through the strain reliefs
After you have installed the tray and cables, route the power cables through the strain reliefs located
on the power supply handles as shown in Figure 2.
Routing power cables through the strain reliefs Figure 2.
1.3. Installing the CMA
The CMA can be installed on either the rear right or rear left side of the rails as described in the CMA
Installation Instructions. Mounting the CMA on the side that is opposite of the power supplies (left-side
mount) is recommended; otherwise, the CMA must be partially disconnected in order to remove the
outer power supply. Refer to Section 2 for details on power supply replacement.
NOTE: If you are installing fiber-optic cables in the CMA, a cable bend radius of at least 1 inch must be
maintained throughout the length of the cable. It is recommended that fiber-optic cables be routed on
the exterior of the cable bundle to increase the bend radius of the fiber-optic cables through the CMA.
Additionally, a large amount of slack at the entrance and exit of the CMA is recommended.
1.3.1. Installing the inner CMA attachment bracket
As described in the CMA Installation Instructions, locate and attach the appropriate inner CMA
attachment bracket based on which side you wish to mount the CMA. Use the bracket marked “A” for
mounting the CMA on the left side, and the bracket marked “B” for mounting on the right side. See
Figure 3.
Attaching the inner CMA attachment bracket Figure 3.