Best practices: Power configuration guidelines
The following section provides best practice guidelines for evaluating and connecting
power, as well as for choosing a UPS component.
Uptime Institute best practices
Follow these best practice guidelines when connecting AC power to the array:
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The EMC customer engineer (CE) should discuss with the customer the need for
validating AC power redundancy at each bay. If the power redundancy
requirements are not met in each EMC bay, a Data Unavailable (DU) event could
occur.
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The customer should complete power provisioning with the data center prior to
connecting power to the array.
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The customer‘s electrician or facilities representative must verify that the AC
voltage is within specification at each of the power drops being fed to each EMC
product bay.
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All of the power drops should be labeled to indicate the source of power (PDU)
and the specific circuit breakers utilized within each PDU:
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Color code the power cables to help achieve redundancy.
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Clearly label the equipment served by each circuit breaker within the customer
PDU.
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The electrician or facilities representative must verify that there are two power
drops fed from separate redundant PDUs prior to turning on the array:
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If both power drops to a bay are connected to the same PDU incorrectly, a DU
event will result during normal data center maintenance when the PDU is
switched off. The label on the power cables depicts the correct connection.
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The electrician should pay particular attention to how each PDU receives power
from each UPS within the data center because it is possible to create a scenario
where turning off a UPS for maintenance could cause both power feeds to a single
bay to be turned off, creating a DU event.
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The customer’s electrician should perform an AC verification test by turning off
the individual circuit breakers feeding each power zone within the bay, while the
Customer Engineer monitors the LED on the SPS modules to verify that power
redundancy has been achieved in each bay.
One PDU should never supply both power zone feeds to any one rack of equipment.
Power extension cords, connectors, and wiring
The following section illustrates a variety of extension cords that offer different
interface connector options. The selected cords are used to interface between the
customer’s power source and each PDU connection.
The amount of cords needed is determined by the number of bays in the array and the
type of input power source used (single-phase or three-phase).
Power cabling, cords and connectors
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Site Planning Guide
VMAX 250F, VMAX 450F, VMAX 850F, VMAX 950F with HYPERMAX OS
