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C120-H007-05EN 77
6.4 Grounding
6.4.1 Grounding equipment in the computer room
For grounding equipment, connect a protective grounding conductor to the dedicated
grounding electrode.
Figure 6.4 Method of grounding equipment
If possible, do not connect an equipment cabinet to the ground built into the floor of
the computer room (such as a mesh ground) through a separate wire. This could
cause stray current to flow into the system and cause a malfunction.
The grounding method for the server systems depends on whether the computer room
is in a building that conforms to the Grounding Regulation Types or the International
Electrotechnical Commission (IEC) standards.
(1) Grounding in the buildings in conformance with the Grounding
Type:
The grounding conditions for the server systems to be installed in the domestic or
others' buildings which are in conformance with the Grounding Type with A to D type
are as follows:
To run the server systems in the computer room stable, the dedicated grounding cable
facility must be prepared for each server system to prevent extraneous noise coming
from the distribution line or other grounding system lines.
The grounding cable facilities to be installed in the computer room must have
dedicated grounding electrode. Primarily, the wiring from the dedicated grounding
electrode through the distribution panel in the computer rooms must be implemented
by the metal conduit installation method using the special insulated cables. This
ground wiring facility must not be shared with other facilities.
The grounding resistance of the dedicated grounding electrode and the grounding
trunk cable must be as follows:
z Grounding resistance of the dedicated grounding electrode: 10 Ω or less
z Size of the grounding trunk cable: 22 mm
2
(AWG 4) or more
Transformer
Secondary single
wire ground of
the transformer
Line filter
Equipment
Protective grounding conductor
Flow of leakage current