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MERLIN LEGEND Communications System Release 6.1
Installation
555-661-140
Issue 1
August 1998
Installing the Control Unit
Page 2-14
AC Power and Grounding
— At least 20 ft. (6.1 m) of one or more steel reinforcing rods,
each at least
½ in. (1.27 cm) in diameter
— 20 ft. (6.1 m) of bare copper conductor not smaller than #4
AWG, encased in 2 in. (5 cm) of concrete
NOTE:
This electrode must be located within and near the
bottom of a concrete foundation or footing that is in
direct contact with the earth
— Ground ring, consisting of at least 20 ft. (6.1 m) of bare
copper 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.
!
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.