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2-12 Reference Guide
Model No.
Running Head
System Power and Ground Connections System Installation
Sites using only loop start telecommunication circuits (no ground start or E&M signaling) can
operate properly without the Telecom Signaling Ground.
When grounding the system, use 14 gauge solid wire for a single connection to the terminal
block connector. When there is no way to provide multiple separate ground feeds use 16 gauge
solid wire to connect from one terminal block pin to another terminal block pin with a ground
feed on one of the terminal block pins that are looped together. If you use different gauge wire
on the feed terminal block pin and the looped terminal block pins the connection may not have
the proper integrity due to the larger size wire impeding a solid connection to the smaller wire.
Figure 2-6. DC Terminal Block in a DC Environment with one Power Source
C AUT ION: For continued protection
against fire, replace fuses only
with the same type and rating.
F use 8A
T ime Delay
R G R
C OM
V
NA
+
-
V
NB
+
-
V
A
+
-
V
B
+
-
-
+
-48 V DC S upply
-48 V D C R eturn
48 V DC S ource
P rotective E arth/C has s is G round
T erminal B lo