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3.2 Installation of the PBX
78 Installation Manual
Outside Installation
If you install an extension outside of the building, the following precautions are recommended:
a. Install the extension wire underground.
b. Use a conduit to protect the wire.
Note
The surge protector for an extension and CS is different from that for trunks.
Installation of an Earth Rod
Trunk
Extn.
Trunk
Surge Protector
Terminal
Board
Surge
Protector
PBX
(Main Building)
(Another Building)
Extn.: Extension Line
Extn.
Extn.
Earth
Extn.
SLT
PT
PT-interface CS
CS
CS
SLT
PT
PT-interface CS
Trunk
PBX
Earth Rod
(Underground)
Surge Protector
Earthing
Wire