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Installation 15088: J 10/22/99
Total Length of the Style 6 SLC Loop Pair
(including any Style 4 branches):
• LIB-200 - cannot exceed 10,000 feet (3048 meters)
• LIB-200A/LIB-400 - cannot exceed 12,500 feet (3810
meters)
Figure 4.3-2 SLC Loop Wiring Requirements (Style 6)
In a simple Style 6 arrangement, this measurement may be made by
disconnecting Channels A and B at the control panel, shorting the two leads
at the input of Channel A, and metering the two leads of Channel B.
Channel A
Channel B
Channel B
Style 6 SLC Loop
Channel A
LIB
When T-Taps are present they each represent a
Style 4 branch. These Style 4 branches will not
degrade the Style 6 loop and are permissible from
an operation standpoint, but they will not comply
with the NFPA standard for Style 6 SLC
performance.
When Style 4 branches are present, complete the measurement by
opening the short which was placed at the input of Channel A and
perform the Style 4 measurement shown in Figure 4.3-1.
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.
LIB-400
NOTE:
SLC Resistance Measurement
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 finished taking the readings.
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