Matrix Visionpro System Manual

229 Matrix VISIONPRO System Manual
How to Make the Telecom Earth
The Earth (Ground) is the most important safety procedure to prevent electrical shocks and fires. It protects from
lightning strikes, electrical transients, static discharges, electromagnetic interference and electrical hazards.
A proper earth must be in place to protect people and the system. The following explanation shows how a perfect
electrical earth can save lives.
In the above diagram, Vc = Vs *Z2 / Z1 + Z2
Where,
• Z1 is the stray impedance between the electrical parts of the Gadget and the Chassis.
• Z2 is the stray impedance between the Chassis and the Earth.
• If Z2 = 0 then Vc = 0
This formula implies that if the impedance between the Chassis and the Earth is reduced to Zero, then the Voltage
on the Chassis, that is, Vc, would be Zero and hence any person touching the enclosure will not get an electric
shock. Hence Z2 should be made Zero.
This can be done by providing a perfect earth to the electrical equipment.
It is recommended that you provide a dedicated earth for the PBX/any other telecom equipment. This dedicated
earth is called the Telecom Earth (Ground).
Providing a separate Telecom Earth to the telecom equipment eliminates the possibility of any back-voltage on the
earth.
Electrical Parts of the Gadget
Enclosure of the Gadget
A.C. Input
P
N
Vs Vc
Z1
Z2
Earth
System
Protective Earth
Terminal
CO Line
Lightning
Protectors
CO Line
Telecom Earth

Matrix Visionpro Specifications

General

Brand	Matrix
Model	Visionpro
Category	PBX
Language	English