Best Practices for AC Power Connections
Select the proper AC power connection procedure depending on the customer's situation on site.
Topics:
•
Best practices overview for AC power connections
•
Selecting the proper AC power connection procedure
•
Procedure A: Working with the customer's electrician onsite
•
Procedure B: Verify and connect
•
Procedure C: Obtain customer verification
•
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Best practices overview for AC power connections
To assure fault tolerant power, external AC power must be supplied from independent, customer-supplied, power distribution units (PDUs)
as shown in
Figure 27. Two independent customer-supplied PDUs
For systems operating from three phase AC power, two independent and isolated AC power sources are recommended for the two
individual power zones in each rack of the system. This provides for the highest level of redundancy and system availability. If independent
AC power is not available, there is a higher risk of data unavailability should a power failure occur, including individual phase loss occurring
in both power zones.
Before connecting external AC power to storage bays, verify that the bays have been placed in their final position as explained in the
installation guide.
Customer’s
PDU 1
Customer’s
PDU 2
Circuit
breakers
on (|)
Circuit
breakers
on (|)
Circuit breakers - Numbers
27
28
29
30
Circuit breakers - Numbers
...
8
9
10
11
...
Power feed 1
Power feed 2
Figure 27. Two independent customer-supplied PDUs
Selecting the proper AC power connection
procedure
The Dell EMC Customer Engineer must select the proper AC power connection procedure.
The following table summarizes the three possible scenarios to connect customer AC power to the storage array. Select the procedure
that matches the customer's situation.
Table 41. Procedure options for AC power connection
Situation on site
Procedure
The customer’s electrician is available at the installation site.
Procedure A: Working with the customer's electrician onsite
page 63. This procedure assures fault tolerant power in the
storage array.
A
62
Best Practices for AC Power Connections