Panasonic KX-TDA600 Installation Manual page 121

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Outside Installation
Surge Protector
Trunk
Extn.
SLT
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 a trunk.
Installation of an Earth Rod
Surge Protector
Trunk
Earthing
(Underground)
(Main Building)
Trunk
Hybrid
Terminal
IP-PBX
Board
Extn.
Extn.
PT CS
Hybrid
Wire
IP-PBX
Earth Rod
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2.2 Installation of the Hybrid IP-PBX
(Another Building)
SLT
Extn.
PT
CS
Surge
Protector
Earth
Extn.: Extension Line
Installation Manual 121