Siemens Industry, Inc.
Building Technologies Division
A6V10328217_en--_f
5
Figure 4
MLC Wiring Diagram
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
CLASS A WIRING*
NO T-TAPPING ALLOWED
CLASS B WIRING**
T-TAPPING ALLOWED
NOTES:
1. EITHER LOOP MAY BE WIRED AS CLASS A OR CLASS B.
2.
3.
4.
NO END OF LINE DEVICE REQUIRED.
BOTH CIRCUITS SUPERVISED AND POWER LIMITED PER NEC 760.
POSITIVE OR NEGATIVE GROUND FAULT DETECTED AT <25K OHMS ON TERMINALS 1-8.
5. IF LOOP 1 IS UNUSED, CONNECT A WIRE FROM TERMINAL 1 TO 2 AND A WIRE FROM
TERMINAL 3 TO 4. IF LOOP 2 IS UNUSED, CONNECT A WIRE FROM TERMINAL 5 TO 6 AND
FROM TERMINAL 7 TO 8.
*OPERATES IN FULL CONFORMANCE WITH STYLE 6 (ULC DCLA)
LOOP 1
INITIATING
DEVICE
CC-5/
CC-2
LOOP 2
**OPERATES IN FULL CONFORMANCE WITH STYLE 4 (ULC DCLB)
INITIATING
DEVICE
+
-
+
+ +
-
-
-
+
+
+
-
-
-
+
+
+
-
-
-
-
+
+
+
-
-
C24V from the PSC-12/PSX-12 to terminal 17 and -24V from the PSC-12/
PSX-12 to terminal 18 of the slot in the CC-5/CC-2 where the MLC will be installed.
(Refer to Figure 3.)
Each device loop circuit can be wired Class B or Class A. MLC field circuit wiring
does not require twisted, shielded wire. It can be installed in conduit containing low
voltage power, notification appliance circuits, audible and speaker zone circuits, and
RS-485 and other data circuits.
Do not mix MLC and DLC circuits in the same conduit if the wire is untwisted and
the run length exceeds 2000 feet.
Electrical connections for the two loops are shown in Figure 4. Each device loop
circuit can be independently wired in either Class A or Class B configuration.