Dell PowerVault 775N (Rackmount NAS Appliance) - Manual (Page 50)

circuit.
CAUTION: For operation in Europe, the NAS SCSI cluster requires two circuits rated in excess of the
combined load of the attached systems. Refer to the ratings marked on the back of each cluster component
when determining the total system's electrical load.
See your system and storage system documentation for more information about the specific power requirements for your
cluster system's components.
Dell recommends the following guidelines to protect your cluster system from power-related failures:
For cluster nodes with multiple power supplies, plug each power supply into a separate AC circuit.
Use uninterruptible power supplies (UPS).
For some environments, you may consider having backup generators and power from separate electrical substations.
Each cluster component must have power supplied by two or three separate AC circuits—one circuit to each component power
supply. Therefore, the primary power supplies of all the NAS SCSI cluster components are grouped onto one or two circuits
and the redundant power supplies are grouped onto a different circuit.
Figure 3-12 and Figure 3-13 illustrate the proper power cabling for the PowerVault 770N NAS systems with two PowerVault
21xS and 22xS storage systems, respectively.
Figure 3-14 and Figure 3-15 illustrate the proper power cabling for the PowerVault 775N NAS systems with two PowerVault
21xS and 22xS storage systems, respectively.
Figure 3-12. Power Cabling for PowerVault 770N NAS Systems and PowerVault 21xS Storage Systems