ND-71548 (E) CHAPTER 2
Page 29
Issue 2
INSTALLATION DESIGN
Figure 2-15 DC Main Power Cable and Main Ground Cable (Multiple IMG Configuration)
BATTERY
AC POWER
DISTRIBUTION
BOARD
VCT
BATTERY
CABLES
RECTIFIER
POWER AND GROUND CABLES
Earth Bar
AC SERVICE
OUTLET
MAT
MDF
GROUND
TERMINAL
G
IV (G)
(ex. 6AWG)
FE
E
-48V
G
IV (BL)
IV (R)
-48V
G
IV (G)
IV (BL)
IV (R)
CABLES
(ex. 14AWG)
-48V
A
GND
FEBAB
-48V
A
GND
FEBAB
-48V
A
GND
FEBAB
DFB CV or IV
CV or IV
CV or IV
CV or IV
iv(g)
IV (R)
IV (BL)
IMG 3
IMG 2
IMG 1
IMG 0
NFB
-48V
A
GND
FEBAB
Note 1: Do not make a multiple connection across “A” terminal and “B” terminal of -48V. Likewise, do not
make a multiple connection across “A” terminal and “B” terminal of GND.
Note 2: It is recommended that each -48V lead from the PBX be connected to a separate circuit breaker at the
rectifier.
Note 3: When the lightning occurs, it might cause the difference of voltages between IMGs, and damage these
electric circuits. To keep from the differences of voltages in case, use one main power to connect the
IMGs.
The cables between connecting each of the terminal boards must be as short as possible.