Figure 8.1 Designating Alarm Zones - Fujitsu M10 Series Installation Planning Manual

CHAPTER 8 Security Actions
It is also important to train and prepare staff to fight fires before they become too
serious.
While the Fire Services Law and other relevant regulations dictate that certain fire-
fighting equipment be available, this equipment is not necessarily adequate for server
system security. The installation of more appropriate fire-fighting equipment is
recommended, even if they are not required by these laws and regulations.
(1) Automatic fire alarms
Keeping human guards to constantly monitor for fires provides the best protection,
however this is not always practicable at night or during holidays. Further, full
monitoring may not be possible even if guards are available. Automatic fire alarms
are useful in these situations. Computer rooms and data storage rooms should each be
designated as independent alarm zones (see
An alarm zone is an area in which a single line of an automatic fire alarm is capable of
detecting fires. An independent alarm zone may not exceed 600 m
with the length of each side not exceeding 50 m (160 ft), and may not span two or
more floors. If the computer room exceeds these limits, it must be split into two or
more alarm zones.
For fire-resistant building, automatic fire alarm sensors should be installed on the
finished surface of the ceiling. In the computer room, sensors should also be installed
under the free-access floor, and also in the ceiling if return air from the air conditioner
passes through the ceiling.
It is also recommended that smoke sensors that operate on both an ion and
photoelectric principle be installed in the computer room and the data storage room.
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Figure 8.1 Designating alarm zones

Figure 8.1).
2 2
(6460 ft ) in area,
C120-H007-08EN