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Installation
2.4.2 Lightning Protector Installation
A lightning protector is a device to be installed on a CO line to prevent a dangerous surge from
entering the building and damaging equipment. A dangerous surge can occur if a telephone line
comes in contact with a power line. Trouble due to lightning surges have been showing a steady
increase with the development of electronic equipment. In many countries, there are
regulations requiring the installation of a lightning protector. A lightning strike to a telephone
cable which is 10 m above ground can be as high as 200,000 volts. This system should be
installed with lightning protectors. In addition, grounding (connection to earth ground) is very
important for the protection of the system.
Installation Diagram
CO
Outside Installation Diagram
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.
CO
EXTN.
TEL
36
CO
Lightning
Protectors
Terminal
Board
EXTN.
DPT or SLT
Ground
Protectors
CO
Terminal
System
Board
EXTN.
EXTN.
TEL
CO
System
EXTN.
Protective
Earth
Terminal
EXTN.
ISDN TEL
Frame Ground
CO:
Outside line
EXTN.: Extension line
(Another Building)
EXTN.
Lightning
Protector
Ground
SLT
ISDN TEL
Installation Manual
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