System design
The fire system design should be
to
BS 5839:Part 1:2002 + A2:2006
Code of Practice for system
design installation and servicing.
Supplemented with customer
requirements.
Mains Supply
The control panel mains supply
must be via a fused spur unit
rated:
5A - 1 & 2 Zone panel/Repeat
panel
7A - 4 & 8 Zone panel
Standby Supply
With the recommended batteries
the control panel will provide a
standby supply under mains
failure conditions. A period of
72 hours followed by 30 minutes
of alarm load is possible and is
dependent on the system loading.
24V power supply
The power supply terminals ‘24+
and 0’ may drive external ancillary
equipment and is designed to be
used in conjunction with auxiliary
contacts and common fire and
fault outputs. The maximum
currents are 250mA (1 & 2 zone)
and 500mA (4 & 8 zone). The
supply is monitored for faulty 24V
supply level or fuse blowing.
NOTE:
The use of the 24V
supply will affect the panel
standby capability.
Fire Detection
(Zone Circuits)
Each zone circuit can have up to
3.0mA load. An end-of-line
capacitor unit or bipolar capacitor
is required for zone circuit
monitoring, which must be fitted
after the last detector or manual
call point on the circuit.
All
manual call points used must
have a 470 ohms series resistor.
Where a zone circuit is not being
used, the
end-of-line capacitor unit
or bipolar capacitor must be fitted
across its terminals in the panel.
System design
Fire Panels
2
4188-424 issue 4_Part 1_10-09
Un-used Zone circuits must
be terminated with an
end-of-line Capacitor unit
or bipolar capacitor
End-of-line Capacitor unit
or bipolar capacitor
RED
BLACK
FIRE DETECTION (ZONE) CIRCUIT
A fire detector head may be fitted
to a diode-base for continuity when
a detector head is removed and
there can be a maximum of up to
20 diode-bases per zone circuit.
MANUAL
CALL
POINT
NOTE: Spur wiring is not permitted off zone circuits.
Zone
Circuit
Zone
Circuit
Control panel
Z1+
Z2+
Z1-
Z2-
BLACK
RED
FIRE
DETECTOR
Figure 1 Zone circuit - used and unused
IN
C
OUT
NC/NO
IN
IN
1
1
7
7
6
6
5
5
4
4
3
3
2
2
OUT
OUT
IN
1
7
6
5
4
3
2
OUT
IN
1
7
6
5
4
3
2
OUT
IN
1
7
6
5
4
3
2
OUT
LED unit
Base showing
End of Line
device fitted
Base with LED
connection
Base with Relay
connection
Standard base shown. Diode
base connection is identical.
Standard base
MCP
Zone
Circuit
Zn+
Zn-
1
2
3
NOTE: LED unit is supplied
with LED module
NOTE: End of line unit
is supplied with panel
Zone
Circuit
Control panel
Zn+
Zn-
Earth continuity
+
-
Control panel
Connection to 17800 range of detector bases are shown here.
Figure 2 Connection to detectors, call points and panel
