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DEFINITY Enterprise Communications Server Release 6
Installation and Test for Multi-Carrier Cabinets
555-230-112
Issue 5
May 1998
Install and Connect Cabinets
Page 1-22Connect DC Power and Ground
1
Mixed AC/DC Power and Ground
Figure 1-8 shows a power and ground layout for a mixed AC/DC-powered
cabinet configuration in the same equipment room with the PPN being DC
powered and the EPN being AC powered. If a second EPN is part of the system,
use the same basic connections shown in Figure 1-8
.
Figure 1-8. Typical Power and Ground for a Mixed AC/DC-Powered Cabinet
Approved
ground
1/0AWG(50mm)up
to 50 feet (15.2 m) or
engineered for less than 0.5
voltage drop per conductor
2
To
AC power
source
EPN
cabinet
AC power cord
AC power-
distribution
unit
Cabinet Ground Block
-48V
-48V RTN
PPN
cabinet
75A
-48V
DC power supply
System
single-point
ground
Coupled Bonding Conductor
To CBC terminal
block at MDF
cydfacdc RPY 021798
Ground
discharge
bar