Connecting To The Circuit Board; Sounder Circuit Wiring - Kidde FireBeta XT+ Operation And Maintenance Manual

8

Connecting to the circuit board

All connections for field wiring are to rows of terminals along the top and bottom of the circuit board.
Shielded fire alarm cable such as FP200 and metal cable glands must be used for all connections to the
panel.
The shield of the cable must be bonded securely to the enclosure earth via a metal cable gland.
The resistance of any core of any cable must not exceed 25 ohms. The shield of the cable must be
bonded securely to the enclosure via the metal gland.
Wiring should enter the enclosure at the top or back of the panel using the knockouts provided and be
formed tidily to the appropriate terminals.
Terminals are capable of accepting wires of up to 2.5mm
Wiring must not go across the front of the circuit board. If cable entries need to be in positions other than
at the knockouts provided, wiring must be fed behind and well away from the surface of the circuit board.
The space at the bottom of the enclosure is largely occupied by the standby batteries so this must be
borne in mind when considering cable entries.
8.1

Sounder circuit wiring

All sounders must be of the polarised type. If non-polarised sounders are used the control panel will
permanently show a fault condition. See table 2 for a list of compatible sounder types.
Sounder circuits are monitored for open and short circuit faults by placing a 10K 0.25W end of line
monitoring resistor across the last device on the circuit.
Sounder circuits must be wired as a single, radial circuit with no spurs or T junctions to enable the
monitoring circuit to work correctly.
SOUNDER
OUTPUT
TERMINALS
Sounder circuit wiring through an MTL778ac I.S. barrier
TM206
2
.
POLARISED
SOUNDER
+ IN + OUT
- OUT
- IN
See manufacturers
details for detailed
connection information
11 of 35
POLARISED
SOUNDER
10K end of
+ IN + OUT
line resistor
- OUT
- IN
See manufacturers
details for detailed
connection information
Issue 1.0