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2.2 Installing the Advanced Hybrid System
Installation Manual 39
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 is different from that for an outside (CO) line.
Installation of an Earth Rod
1. Connect the earth rod to the surge protector using an earthing wire with a cross-sectional area
of at least 1.3 mm
2
.
SLT PT
(Main Building)
Outside
(CO) Line
Outside (CO) Line
Extn.
Extn.
Extn.: Extension Line
Earth
(Another Building)
Extn.
Extn.
Surge Protector
Terminal
Board
Surge
Protector
SLT
PT
PBX
Surge
Protector
Outside
(CO) Line
Earthing Wire
(Underground)
Earth Rod
PBX