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P/N P-047550-1788-EN • REV 013 • ISS 08SEP19
Application
For Class A pathways, install SIGA-IM modules to segment the SLC
as required (e.g., by zone or by number of devices) to prevent a wire-
to-wire short from taking down the entire circuit. See Figure 3 and
Figure 4.
For Class X pathways (see Figure 5):
•
Install a SIGA-IM module on the Class B out and Class A return
wiring inside the control unit, or in the same room, within 20 ft.
(6.1 m), and wiring enclosed in conduit or equivalently protected
against mechanical injury.
•
Install a SIGA-IM module on both sides of one or more standard
mount modules contained in a common enclosure.
•
Install a SIGA-IM module on both sides of a single standard mount
module, in the same room, within 20 ft. (6.1 m), and wiring
enclosed in conduit or equivalently protected against mechanical
injury.
•
Install a SIGA-IM module on both sides of a common enclosure
containing one or more UIO plug-in modules, in the same room,
within 20 ft. (6.1 m), and wiring enclosed in conduit or equivalently
protected against mechanical injury.
Figure 3: Typical Class A with isolated Class B branches
(1) Devices effectively removed from the
circuit
(2) Short circuit
(3) SLC out
(4) SLC return
Figure 4: Typical Class A with isolators
(1) Devices effectively removed from the
circuit
(2) Short circuit
(3) SLC out
(4) SLC return
Figure 5: Typical Class X
(1) Common enclosure
(2) Standard mount module
(3) UIO plug-in module
(4) Field wiring in the same room, within 20 ft. (6.1 m), and enclosed
in conduit or equivalently protected against mechanical injury
(5) Automatic fire detectors attached to isolator bases
(6) SLC Class B out
(7) SLC Class A return
SLC
A+ A-
SLC
B+ B-
(1)
(2)
(3)
(4)
FACU
IM
IM
IM
IM
SLC
A+ A-
SLC
B+ B-
(1)
(2)
(3)
(4)
FACU
IM
IM
IM
IM
SLC
A+ A-
SLC
B+ B-
(6)
(7)
FACU
IM
IM
IM
IM
(2)
IM
IM
(4)
(2)
(4)
IM
IM
(4)
(4)
(3)
(1)
(1)
(5)
(5)
(2)
