Fujitsu PRIMERGY BX600 S3 Service Supplement Manual page 17

Important notes Notes on mounting the basic unit in the rack
Before connecting or disconnecting cables, read the notes in the
chapter "Important Notes" in the Technical Manual for the relevant
rack. The Technical Manual for the rack is supplied with the rack.
The rack must be connected to the mains by an authorized specialist
(electrician).
If the server system is integrated in a rack installation that receives
power from an industrial (public) power supply network with the
IEC309 connector, the (public) power supply protection must comply
with the requirements for the non-industrial (public) power supply
networks for the type A connector.
The power supply for the rack should be distributed over the three
phases of a three-phase mains connection.
Phase redundancy is possible in regions, where a single phase
provides 200 - 240V; in other regions with lower single phase voltage,
two phases must be coupled and complete phase redundancy thus is
not possible.
Service Supplement 17