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30 C120-H007-05EN
CHAPTER 3 Equipment Layout
3.4.5 Dusting
Units that use paper or toner in operation, such as line printers and laser printers,
produce dust. The relation between dust-producing devices and device that should be
dust-free requires special consideration. For example, dust-free devices can be
installed near the air outlet, while the dust-producing devices can be near the air
intake.
3.5 Power Supply Facilities
This section describes power supply facilities.
3.5.1 Power supply facilities for server system
The power supply facilities required for a server system include transformers, voltage
regulators, and distribution panels. Some of these are installed in the server room.
Table 3.1 summarizes the kinds, uses, and locations of the power supply facilities.
Table 3.1 Kinds, uses, and locations of power supply facilities (1/2)
Power supply Use Location
High-voltage transformers
(dedicated to server systems or
shared by other facilities)
Transforms a high transmission
voltage into a commercial voltage.
Installed in a power user's
electrical facility room, in a power
company's transformer room, or
on a pole.
Voltage regulators such as an
uninterruptible
power supply (UPS)
Compensates for momentary
interruptions or voltage variations
in commercial power.
Installed in a power user's
electrical facility room or
computer room.
Generally, a UPS is installed in a
dedicated electrical facility.
A UPS rated at less than 100 kVA
may be installed in a computer
room.