Power And Grounding - AT&T MERLIN LEGEND System Reference Manual

System Capacities and Requirements

Power and Grounding

Power Specifications
Grounding Requirements
6-8 Power and Grounding
Proper power and grounding are essential for correct and safe functioning of the
s y s t e m .
The system control unit plugs into a 117-VAC outlet. To avoid accidental
disconnection of the system, this outlet should not be controlled by a wall
s w i t c h .
Each carrier
unit requires
maximum current of 3 amps. Therefore, if expansion carrier units are added to
the system, extra AC outlets may be needed.
Proper grounding of the installation site protects the system against
lightning
power surges
power crosses on outside lines/trunks
electrostatic discharge (ESD)
The telephone company is responsible for providing protection of outside
lines/trunks at the entrance to the site. The protection should consist of
carbon blocks or gas discharge tubes connected to an approved ground
adequate bonding of the outside line/trunk protector ground and the power
company ground
WARNING:
Improper ground can result in equipment failures and service outages.
Veritfy that the AC power uses an approved ground for its primary ground,
that all voltage-limiting devices are grounded to an approved ground, and
that the ground is one of the approved grounds below.
Approved grounds are
The metal frame of the building
a metal water pipe connected to an underground water pipe that is in direct
contact with earth
an electrode encased by at least two inches of concrete and located within
and near the bottom of a concrete foundation or footing in direct contact with
earth
a copper ring that encircles a building and is in direct contact with earth
its own power supply. Each power supply requires a