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C120-H007-05EN 71
6.2 Power Supply Facilities
b) Transformers dedicated to 400 V server systems
Table 6.4 describes the types of high-to-low-voltage transformers that can be
dedicated to 400 V server systems and those that can be shared with other power
supplies.
Table 6.4 Transformers dedicated to 400 V server systems
Case
Transformer
dedicated to a server
system
Schematic view
A dedicated high-to-low-voltage
transformer can be installed.
Install a transformer in
the power receiving/
transformer room. If the
power receiving/
transformer room is not
close to the computer
room, install a separate
transformer near the
distribution panel in the
computer room.
The secondary terminal
of the separate
transformer shall be
grounded to a neutral
phase wire.
High-voltage line
A high-to-low-voltage
transformer that is shared with
other power supplies.
Install a separate
transformer near the
distribution panel in the
computer room, with its
secondary terminal
grounded to a neutral
phase wire.
High-voltage line