3Com 4200G Getting Started Manual page 32

32 C 2: I
HAPTER NSTALLING THE
Connecting the
Earthing Cable
S
WITCH
Figure 10 RPS Connection to the Switch
4 0 V ;5
~
1 0 0 -2
NULL
-48 -60V;2 0A
Null
Pinout
When the RPS is connected to the switch, you can move the circuit
breaker in the RPS to the closed (on) position and the switch will be
powered by the -48V DC power.
The -48V DC power takes priority over the AC mains and powers the
switch if it is connected.
Use the earthing cable that accompanies your switch if the length is
suitable. Alternatively use the earthing cable specification as defined in
Appendix C on page 127.
The earthing cable is only required if the switch is powered by the RPS
only.
The recommended cable length should not exceed three metres (9.84
feet).
N U LL
+ -
A
0 V ;2 .0
-4 8 -6
z ;1 .0 A
0 /6 0 H
-
+
Cable Tie