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2.2 Installation of the PBX
50 Installation Manual
2.2.10 Surge Protector Installation
Overview
A massive electrical surge can be caused if lightning strikes a telephone cable 10 m (33 ft) above ground,
or if a telephone line comes into contact with a power line. A surge protector is a device that is connected
to a CO line to prevent potentially dangerous electrical surges from entering the building via the CO line and
damaging the PBX and connected equipment.
To protect the system from electrical surges, we strongly recommend connecting the system to a surge
protector 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 grounding is very important for the protection of the system (refer to "2.2.5 Frame
Ground Connection").
Many countries/areas have regulations requiring surge protection. Be sure to comply with all applicable
laws, regulations, and guidelines.
Installation
CS
Extn.
Extn. Extn. Extn.
SLT
APT
CO Line CO Line CO Line
Extn.: Extension line
Surge
Protector
Terminal
Board
PBX
Frame
Ground
Ground