Wiring the Signaling Line Circuit
30
Document #15668 Rev.I 04/20/98 P/N 15668:I
Style 4 Two-Wire Communications Loop (supervised and Power-limited)
The 2-wire communication loop meets NFPA 72 Style 4 requirements and may be T-tapped.
1 2 3 4 5 6
T
B
6
A B B+ A+ B- A-
Shield
FIGURE 2-11:
Two-Wire Communications Loop
Connect (+) to TB6-3
Connect (-) to TB6-5
BG-10LX
SD300
C304
M300
I300
I300
Note: I300 devices are
not required to meet
NFPA Style 4.
CAUTION! Do not
loop wiring under
any terminals. Break
wire run to maintain
supervision.
Separate T-tap to
other loop devices.
-
+
-
+
+
-
-
+
NO
NC
COM
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