A rack power distribution unit must match the facility supply and the connected equipment under normal and degraded conditions. Begin with the rack load plan, input circuit and required redundancy. Outlet count and an impressive total power figure are insufficient to establish that a PDU is suitable for an AI server rack.
Map the supply to each equipment inlet
Eaton's rack PDU buying guide distinguishes basic distribution from monitoring and outlet-switching functions. Choose these functions after defining the electrical connection, rather than using the management feature list as the primary selection criterion.
Record the site's supply voltage, phase arrangement, input connector and available circuit capacity. List each server power-supply inlet, expected operating load and approved cord set. Review the PDU's input, branch and outlet limits together with the facility electrical team. The usable rack load must satisfy all applicable limits, not simply the sum of outlet labels.
Size the redundant feeds for the failure case
Draw the A and B power paths through upstream equipment, PDUs and server power supplies. Identify shared dependencies so that two cords do not create a false impression of independent supply. Model the remaining feed's load when one path is lost, using the actual power-supply sharing behavior.
For three-phase distribution, map equipment connections to the PDU's branch and phase arrangement. Check balance at realistic operating loads and preserve room for the planned expansion. Include cable routing, retention and access to breakers or service modules in the mechanical layout review.
Define monitoring and operational controls
Decide whether input-level readings are sufficient or individual outlet measurements are required. For switched outlets, specify who may issue commands and how accidental interruption will be prevented. Check the supported management interface, authentication, update process and integration with the site's monitoring system.
During acceptance, verify outlet identification, measurement visibility, alarm delivery and the documented configuration backup process. Have qualified personnel perform electrical installation and any planned failure tests under an approved procedure. Keep the final load map and PDU ordering codes with the rack record so future equipment additions can be assessed against the remaining capacity.
Frequently asked questions
Does a switched PDU always measure every outlet?
No. Switching and metering are separate features. Verify the exact model's measurement granularity and control capabilities.
Can a PDU increase the power available from the facility?
No. It distributes the supplied power within its ratings. Upstream circuit capacity and the facility design still constrain the rack.
Request a rack PDU quotation with supply details, outlet requirements, rack dimensions and monitoring needs. Stock, price and lead time are confirmed in the quotation.