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MERLIN LEGEND Communications System Release 7.0
Pocket Reference
555-670-116
Issue 1
April 1999
35
Power and Grounding
■ Do not place anything on top of carriers.
■ Do not install the control unit under any device that may drip
fluid, such as an air conditioner.
■ Do not expose the control unit to moisture, corrosive gases,
dust, chemicals, spray paint, or similar materials.
Power and Grounding
Proper power and grounding are essential for correct and safe
functioning of the system.
Power Specifications
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 switch.
Each carrier unit requires its own power supply. Each power supply
requires a maximum current of 5.4 amps. Therefore, if expansion
carrier units are added to the system, extra AC outlets may be
needed.
Grounding Requirements
Proper grounding of the installation site protects the system against
the following:
— Lightning
— Power surges
— Power crosses on outside lines/trunks
— Electrostatic discharge (ESD)
The local telephone company is responsible for providing protection
of outside lines/trunks at the entrance to the site. The protection
should consist of the following:
— 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:
!
An improper ground can result in equipment failures and
service outages. Verify 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 listed below.
The following is a list of approved grounds, starting with the most
preferred:
— Building steel.
— Acceptable water pipe, must be a metal, underground water
pipe at least 1/2-inch (30.4 cm) in diameter, and in direct
contact with the earth for at least 10 feet (3 m).
— It must be electrically continuous so that the protector ground
is connected. (Check for insulated joints, plastic pipe, and
plastic water meters that might interrupt electrical continuity.)