Lucent Technologies 6.1 manual Grounding Requirements

MERLIN LEGENDCommunications System Release 6.1		Issue 1
System Planning 555-661-112		August 1998
1 Before You Begin
	Confirming the Location of the Control Unit	Page 1-4
	Grounding Requirements	1

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

!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

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