To protect the system from electrical surges, we strongly recommend connecting the system to a surge pro-
tector that meets the following specifications:
–
Surge arrestor type: 3-electrode arrestor
–
DC spark-over voltage: 230 V
–
Maximum peak current: at least 10 kA
Additionally, proper earthing is very important for the protection of the system (refer to "3.2.4 Frame Earth
Connection").
Many countries/areas have regulations requiring surge protection. Be sure to comply with all applicable
laws, regulations, and guidelines.
Installation
Trunk
Trunk
Earth
Surge
Protector
Trunk
Extn.
Extn.
Extn.: Extension line
PBX
SLT
Frame
Earth
Terminal
Board
Outside Installation
Extn.
Trunk
Surge Protector
Trunk
Terminal
Board
Surge
Protector
PBX
(Main Building)
Extn.
Extn.
Earth
Extn.
SLT
(Another Building)
SLT
Extn.: Extension Line
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.
3.2.9 Surge Protector Installation
57