FRAME GROUNDING 8-3
Installation NWD-107460-02E
Notes
* NEC recommends that frame ground of ODU should be connected to
earth line as NEC’s standard installation.
EP Earth Ground Point of tower
FG Frame Ground terminal of the IDU (5 mm square cable (means more
than 2.5 mm diameter cable (AWG #10) is recommended to apply for the
earth grounding. The proper press fix terminal tool shall be used.)
This connection is an example.
Fig. 8-2 Connection for Frame Grounding (2/2)
Lighting rod
Earth line
ODU
FG
Earth line*
Coaxial cable
INDOOR EARTH
GROUND
LEVEL
IDU
(Grounding-resistance:
less than 10 ohms)
isolated from tower
(Grounding-resistance:
less than 10 ohms)
(Grounding-resistance
of tower: less than
Grounding cable for ODU should be
connected to the nearest EP of the tower.
EP
LINE
It lets through the center of the steel
tower as much as possible.
The coaxial cable lets through the inside of the steel tower.
The earth between ODU-IDU lets through the inside of the
steel tower.
Coaxial cable
Earth line
This is the buried earth
wire.
This type of wire is not an
insulated winding wire and
recommends to make a
naked wire.
10 ohms)
Use a copper grounding conductor to ground the rack.
The grounding conductor to the CO GND be connected to
the rack.
Tower
Submission Prohibited
NEC Internal Use Only
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