EQUIPMENT:
FIRE
CLASS
DUO-CEL
PUBLICATION:
OM_DUO-CEL_APP
ISSUE No. & DATE:
2 20/06/18
PAGE 30 of 46
Figure 12
– Twin-Wire EOL device
Resistor
330R 1W
Zener Diode
17V 5W
Connect bare leads to + & -
terminals in last zone device
Sleeved EOL device
+ve
-ve
+ve Thick Lead
-ve Thin Lead
11.10.4 Maximum Number of
Detectors/MCPs on a Zone
For the standard panel with 10uF EOL capacitor,
the maximum number of detectors & MCPs per
zone is limited to 32.
For the standard panel with EOL resistor, the
maximum number of devices allowed on a zone is
limited by the quiescent current drawn by each
device. The quiescent current will be listed on the
device data sheet provided by the Manufacturer of
the device. See section 7.1 for details.
The maximum quiescent current available to power
devices on a zone is 1.6mA. Exceeding this value
will prevent the panel from correctly monitoring for
open circuit fault conditions.
For the Twin-Wire panel the maximum number of
detectors & MCPs per zone is limited to 16 (or less,
see section 7.1) if sounders are also connected. If
no twin-wire sounders are on the zone then up to
30 detectors & MCPs may be connected (see
section 7.1 for details). The maximum number of
twin-wire sounders permitted is 12 (or less; see
section 7.1).
Note: It is a recommendation of BSEN 54-2 that
there should be no more than 32 detectors &
MCPs in a zone.
Figure 13
– Standard Zone Wiring Diagram
Detector.
Smoke or Heat
Detector with
diode base
(Schottky Diode
preferred)
ZONE 1
Z1 + Z1
–
+
-
+
-
+
-
+
10uF 35V
end-of-line Capacitor
1 2
1A 2A
Manual Call Point.
ALERT
:
CP200, CP230,
CP260
or equivalent with
internal resistor
between 470R & 1K
EVACUATE
:
CP211
Or equivalent with
internal resistor
between 360R & 220R
