TT power distribution system
PGND
L
N
L
N
PGND
• In the case of the TT power distribution system, it is recommended that an external
grounding device be adopted. For example, use the dedicated grounding device of the
building (such as the grounding flat steel sheet, grounding stud, and ground bar) or the
base steel bar of the reinforcement concrete of the building, or deploy a new earth screen.
• Use the ground cable (the cross-sectional area of the ground cable must be greater than
or equal to 6 mm
2
) to connect the ground bar and all the internal devices, and the ground
bar to the network cabinet in an equipotential manner through a metallic structure.
• Connect the external ground cable (PGND cable) of the network cabinet to the external
grounding device. As specified by the national grounding standard, the cross-sectional
area of the external ground cable must be greater than or equal to 16 mm
2
.
5 Installing the Equipment
EA5801E
MDF
ODF Ground bar
AC PDU
AC power distribution cabinet
Guide for Grounding the Network Cabinet of the Customer
TT power distribution system
TT 配电系统
MDF
ODF
L N
Power cable
PGND cable
14
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