Outside Installation
Trunk
Extn.
Trunk
Surge Protector
Terminal
Board
Surge
Protector
PBX
(Main Building)
Extn.: Extension Line
Extn.
Extn.
Earth
Extn.
SLT
(Another Building)
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 is different from that for trunks.
Installation of an Earth Rod
Trunk
PBX
Earth Rod
(Underground)
Surge Protector
Earthing
Wire
116 Installation Manual
4.2.11 Surge Protector Installation
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