2-8 Installation
2.7 Exchange Line Connection
Installation
TEL
Lightning
Protectors
CO
Terminal
Board
CO
System
Protective
Earth
Terminal
CO
EXTN.
EXTN.
Ground
EXTN.
TEL Frame Ground
CO: Exchange line
EXTN.: Extension line
TEL: Telephone
Outside Installation
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.
(Main Building)
CO
(Another Building)
CO
CO
Main
Distribution
Frame
Main
Unit
Protectors
EXTN
TELTEL
EXTN
SLT
PT
EXTN
Lightning
Protector
EXTN
Earth
Note • The lightning protector for an extension is different from that for CO.
PSQX1708ZA-03E.QX 99.10.15 5:46 PM Page 8