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Power supply installation Standard 1.07
54 CallPilot
-48 V DC power distribution rationale
Minimum installation is one power distribution unit (PDU) with four 48
V DC branch circuits fused at 20 amperes.
The customer must be able to shut off any branch to ensure every unit at
the site continues to function properly.
DC-powered configuration fits into this scheme as follows:
Each PDU receives four branch circuits.
Each server receives a feed from each PDU and a different branch
circuit.
In this fashion, with dual hot-swappable power supplies, there is no
single point of failure in the power system. For example, you can remove
any power supply, including a PDU, and everything continues to work.
This is applicable to either North American or European installation sites
(with a 230 V AC inverter).
The secondary rack supports four servers and follows a similar scheme.