24 Johnson Controls, Inc. SLC Wiring Manual — P/N 51870:G 04/23/2009
Shielded Wire Termination Full Conduit
3.3 Full Conduit
For use with IFC-200, IFC-300/400, and JLIB-200only
Connect the metal conduit to the cabinet by using the proper connector. Feed the shielded wire
through the conduit, into the control box. The shield drain wire must be connected to the
“reference” or “shield” terminal on the SLC terminal block, or connected to the negative side of the
loop if there is no “reference” or “shield” terminal on the SLC terminal block. Do not let the shield
drain wire or the shield foil touch the system cabinet or be connected to earth ground at any point.
Figure 3.2 Shield Termination – Full Conduit
3.4 Partial Conduit
For use with IFC-200, IFC-300/400, and JLIB-200
If the length of conduit from the control panel cabinet is less than 20 ft. (6.1 m), terminate the
shield as shown. If using a metal box, you must use a metal conduit.
Connect the shielded wire to the junction box by using a proper connector. Scrape the paint on the
cabinet to bare metal to provide a good electrical connection. Connect the metal conduit between
the junction box and the cabinet by using the proper connectors.
Feed the twisted-pair wire into the junction box, through the conduit, into the cabinet box. Within
the junction box, connect the appropriate wires together using wire nuts. Connect the shield drain
wire to the junction box, at the end of the conduit run, as shown below.
Do not allow the shield drain wire to enter the system cabinet or the conduit.
Figure 3.3 Shield Termination – Partial Conduit
NOTE: For Style 6 or Style 7 SLC wiring, connect one end of the shield to the
reference/negative side of the respective channel
Cabinet
Shield Drain Wire
Foil
Conduit
Example at right illustrates
shield drain wire connection
to an SLC terminal block with
a “reference” connection.
Example at right illustrates
shield drain wire connection
to an SLC terminal block
without a “reference” or
“shield” connection.
Shield Drain Wire
Foil
Cabinet
Conduit
+
–
Shield2.wmf, SLC-swterm2a.wmf
Tape over foil.
Cabinet
Shield Drain Wire
Foil
SLC-swterm3.cdr
Conduit
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