Lucent Technologies MERLIN LEGEND Release 6.1 System Planning Manual page 48

MERLIN LEGENDCommunications System Release 6.1
System Planning 555-661-112
1 Before You Begin
Confirming the Location of the Control Unit
Grounding Requirements
Proper grounding of the installation site is essential for correct and safe
functioning of the system. Grounding 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
!
For most surge occurrences, the following standard grounding requirements
provide adequate lightning and power surge protection:
Properly wired, grounded, and bonded outside line protectors
Properly wired and grounded AC outlet
Properly grounded single-point ground bar
Properly wired connection between single-point ground and power supply
CAUTION:
Improper ground can result in equipment failures and service
outages. Verify that the AC power uses an approved ground for its
primary ground and that all voltage-limiting devices are attached to
an approved ground. Approved grounds are as follows:
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 2 inches (5 cm) 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
1
Issue 1
August 1998
Page 1-4