Instruction manual

MERLIN LEGEND Communications System Release 5.0
Installation
555-650-140
Issue 1
June 1997
Installing the Control Unit
Page 2-11
AC Power and Grounding
■ The control unit, the central office trunk protector, and the AC power
service panel should be as close to each other as possible.
■ Because equipment can be located throughout a building, the National
Electrical Code requires that the ground point for the central office trunk
protector be bonded to the AC power ground as shown in Figure 2-3
.
■ The AC outlet and the single-point ground bar must be properly
grounded as shown in Figure 2-1
and Figure 2-3.
■ Each power supply in the control unit must be connected to the
single-point ground bar by a #12 AWG or a #14 AWG solid copper wire.
Figure 2-1
and Figure 2-3 show this connection.
■ This wire run should be as short as possible, preferably within 5 ft.
(152 cm), not to exceed 10 ft. (305 cm). See ‘‘
Approved Grounds’’, later
in this chapter, for more information.
■ The AC outlet must be connected to the 147A protector with a #12 AWG
or a #14 AWG solid copper wire.