Shield Aura - Class X SLC Loops; Notification Appliances

Class X SLC Loops
1. Connect Class X loops
to the terminal strip of
the Aura Fire Alarm
ControlPanel.
2. When the loop is
unused, the loop
termination jumpers
provided with the
panel should be
replaced with 14-22
AWG SLCcable.
The Aura Fire Alarm ControlPanel provides a trouble signal when unused loops are not terminated. All loops
are supervised. Follow NFPAguidelines for placement of isolators with Class Xwiring.
When using Class X wiring, SCI Short Circuit Isolators must be installed before and after each analog
addressable device on the SLC loop. Alternatively, analog devices with built-in SCI may be used.
The wiring from the control panel to the first SCI and from the last SCI back to the control panel must be in
conduit.
Notification Appliances
Notification appliance circuits can be configured in pairs for Class A operation. Class A operation can be
assigned to the first pair of notification appliance circuits (NAC1&2) or the second pair (NAC3&4) or both pairs.
When wiring a pair of NACs for Class A operation, only one of the two End-of-Line diodes is used. Remove the
one from the +/- terminals of the first NAC. Leave the other in-place on the terminals of the second NAC.
For Class B operation, the End-of-Line diode must be removed from the NAC terminals and connected across
the terminals of the last device on the NAC circuit.
Branching of Class A or Class B notification appliance circuits prevents proper circuit supervision and is not
permitted.
SHIELD Fire, Safety & Security Ltd
Aura Fire Alarm Control Panel Installation Manual
Version 1.00 |June 2019 |MAN-1431VS
Page 36
Installation