Lucent Technologies MERLIN LEGEND Release 5.0 Installation Manual page 63

MERLIN LEGEND Communications System Release 5.0
Installation 555-650-140
Installing the Control Unit
AC Power and Grounding
Concrete-Encased Ground. Must be an electrode, consisting of one of
the following:
— At least 20 ft. (6.1 m) of one or more steel reinforcing rods, each at
— 20 ft. (6.1 m) of bare copper conductor not smaller than #4 AWG,
— This electrode must be located within and near the bottom of a
— Ground ring, consisting of at least 20 ft. (6.1 m) of bare copper
!
!
WARNING:
Do not use a metal underground gas piping system—this is a
safety risk.
Central Office Trunk Protection
The local telephone company is responsible for providing the following
protection of central office (CO) trunks at the entrance to the site:
Carbon blocks or gas discharge tubes connected to an approved ground
Adequate bonding of the central office trunk protector ground and the
power company ground
!
CAUTION:
Check these requirements with a simple, visual inspection. If you
cannot verify that the central office grounding requirements are met,
contact the central office. Do not connect the control unit to the
central office trunks until you are certain that these requirements
are met.
½
in. (1.27 cm) in diameter
least
encased in 2 in. (5 cm) of concrete
concrete foundation or footing that is in direct contact with the
earth
conductor (not smaller than #2 AWG) encircling the building. The
ground ring must be in direct contact with the earth and buried at
least 2.5 ft. (77 cm) below the earth's surface.
Issue 1
June 1997
Page 2-14