Determining the right power distribution units (PDU) for data centre racks depends on the equipment to be housed in the rack, the site power distribution and the preference for additional functionality.
According to a new white paper from power and distribution specialist Schneider Electric, the selection process for PDUs follows what it terms an “inside out” order as part of a five-step process, where the first thing to be determined is the output plug type and quantity, followed by an estimate of power capacity, then input plug type, visibility and control options for branch circuits, and finally form factor and mounting.
The white paper discusses the five steps in detail, and outlines the various methods available for estimating the maximum power required per IT rack, utilising a sizing tool that helps estimate a realistic power usage based on specific models and configurations of the equipment housed in a rack.
For determining the input plug type, the paper discusses how decisions about the overall row power distribution should be made, including whether to deliver single or 3-phase power to a rack. The site power distribution scheme (voltage and phase) and the estimated power requirements will dictate the input power cord or whip amperage needed for the IT rack. Steps necessary to mitigate the risk of overloads are also covered.
With visibility being a critical element, rack-level power status monitoring is discussed, covering basic, monitoring and metering views and the situations in which each is appropriate. Finally, the various options for selecting the right form factor, horizontal or vertical, and the appropriate mounting methods are described.
The white paper entitled “How to Choose IT Rack Power Distribution” by Brian Mitchell, product manager, Racks & Enclosures, is a free download.
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