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
grounding 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
should be equal to or greater than 6
mm2) to connect the grounding bar
and all the internal devices, and the
grounding 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 should be equal to or
greater than 16 mm2.
Guide to ground the strength member
Engineering responsibilities
MDF
ODF
4
3
2
5
L
N
PGND cable
Power cable
6
TT power distribution system
1