Lib Slc Loop Wiring Requirements; Branch Resistance - Notifier AM2020 User Manual

Branch Resistance

With the SLC disconnected from the LIB terminals, short the termination point of one branch at a time and mea-
sure the DC resistance from the beginning of the channel to the end of that particular branch. The total DC
resistance from the LIB-200 panel to branch end cannot exceed 40 ohms. The total DC resistance from the LIB-
200A panel or the LIB-400 panel to branch end cannot exceed 50 ohms. Repeat this procedure for all remaining
branches. Refer to Figure 4.3-1 for Style 4 and Figure 4.3-2 for Style 6.
For each channel
Add the lengths of all the branches on one SLC Loop Channel. On the LIB-200, this sum cannot exceed 10,000
feet (3048 meters)per channel. On the LIB-200A or the LIB-400, this sum cannot exceed 12,500 feet (3810
meters) per channel.
LIB-200:
(Branch A) + (Branch B) + (Branch C) + (Branch D) + (Branch E) = 10,000 feet (3048 meters) or less
LIB-200A or LIB-400:
(Branch A) + (Branch B) + (Branch C) + (Branch D) + (Branch E) = 12,500 feet (3810 meters) or less
Channel A or B
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LIB-400
SLC Loop
Channel A
LIB
When power is removed from the SLC, the positive
side of the circuit is opened at each ISO-X isolation module or
isolator detector base. To measure the SLC circuit resistance,
temporarily place a jumper between Terminals 2 and 4 on each
ISO-X while taking measurements. Remember to remove all the
jumpers and test all isolator modules when you have
Branch
Branch A
Branch C
NOTE: SLC Resistance Measurement
finished taking the readings.
THE TOTAL OF ALL BRANCHES ON CHANNEL B:
LIB-200 must be less than or equal to 10,000 feet (3048 meters)
LIB-200A /LIB-400 must be less than or equal to 12,500 feet
(3810 meters)
THE TOTAL OF ALL BRANCHES ON CHANNEL A:
LIB-200 must be less than or equal to 10,000 feet (3048 meters)
LIB-200A /LIB-400 must be less than or equal to 12,500 feet (3810
meters)
Branch B
Branch D
Branch E
Installation 15088:J 10/22/99