Communication Server Large System Installation and Commissioning

Page 116 of 456 Installing DC power
NN43021-310 Standard 02.01 December 2007
Figure 39
Ground and logic return distribution – Large and Small Candeo power systems
AC input
Service
panel
IG or ACEG
120 V
receptacle
Safety ground (#6 AWG, min)
Large System
AC conduit
Rack
Battery / logic
return reference
Note 1: DC power feeds, battery returns, and logic return for Large System
pedestals. Standard practice is to provide two load feeds for each
pedestal, but each pedestal can support up to four load feeds for
higher reliability, if required. Each BAT(-) feed is paired with a
BATRTN(-), and there is one LRTN(+) for each pedestal.
Note 2: The Large Candeo power system delivers up to 500 A from a single
42" (1050 mm) frame and up to 1000 A from a single 84" (2100 mm)
frame. The Small Candeo power system, which comes in
51" (1275 mm) and 84" (2100 mm) racks, delivers up to 300 A.
Note 3: Batteries may be installed in two optional battery trays located
under the rectifier shelves.
Optional
Batteries
See
Note 1
553-AAA1512
BRE/LRE
+
–
Candeo
power
system
(rectifiers,
distribution/
battery
connection
modules,
System
Manager)