Panasonic KX-TD500 System Reference Manual page 170

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4.00 Outside Installation
Protectors
CO
EXTN
TEL
Notice
If you install an extension outside of the main building, the following precautions are
recommended:
(1) Install the extension wire underground.
(2) Use a conduit to protect the wire.
Note
The lightning protector for an extension is different from that for CO.
(Main Building)
CO
CO
Ter-
Main
minal
Unit
Board
EXTN
EXTN
TEL
(Another Building)
EXTN
Lightning
Protector
Ground
2-G-2
SLT
PT

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