Johnson Controls, Inc. SLC Wiring Manual —
P/N 51870:G 04/23/2009
31
NFPA Style 6 SLC Using Isolator Modules
SLC Circuits with Isolators
5.5 NFPA Style 6 SLC Using Isolator Modules
A variation of Style 6 operation using isolator modules to protect a section of the SLC. By flanking
each group of devices with M500XJ fault isolator modules each group is protected from faults that
may occur in the other groups. For example, a fault in Section B will not affect Sections A & C.
The isolator modules on either side of Section B will open the loop. Section A will still operate
from power on the SLC Out side and Section C will operate from the SLC Return side.
•
A combination of isolator modules and isolator bases may be used.
•
T-tapping is NOT allowed within the Style 6 configuration.
•
Isolator modules shall be within 20 ft. (6.1 m) of device and the wire must be enclosed in metal
conduit.
SLC Out
SLC Return
SL
C-
st
yl
e
6
iso
.cdr
Control Panel
Two-wire
Addressable
Detector
Addressable
Pull Station
Section B
Section C
Section A
IFC-200, IFC-1010/IFC-2020: The first
isolator module on SLC Out and SLC
Return must be contained within the same
enclosure as the FACP, or these isolator
modules must be connected within 20 ft.
(6.1 m) of the FACP enclosure in conduit.
Isolator
Module
Isolator
Module
Isolator
Module
Isolator
Module
The first isolator module on SLC Out and SLC Return is
optional for IFC-320, IFC2-640/E, IFC-640/E, IFC-300, IFC-
400 and IFC-3030/IFC2-3030 because the panels provide
the functionality.
Additional isolator module required when first device in the
section is more than 20 feet from the control panel.
Figure 5.4 NFPA Style 6 SLC Using Isolator Modules
Isolator
Module
Isolator
Module
