EP203 AUTOMATIC EXTINGUISHER PANEL
Approved Document No. DFU0002032 Rev 4 • EP203 AUTOMATIC EXTINGUISHER PANEL INSTALLATION MANUAL • Page 13 of 45
Detector Circuit Wiring
Note: See Appendix 4 (Technical Specification) for the detector circuit specification.
The EP203 panel can power three conventional detector circuits at 21-28Vdc. Each
detector circuit must be wired as a single, radial circuit with no spurs. Detector ba ses
with i ntegral c onti nui ty d iode s MUST NOT be used and manual cal l po in t s
MUST NOT be connected to the detector c i rc ui ts .
Note: The total number of detectors affects the system standby time and should be
taken into account when selecting the standby battery. See Appendix 1 for standby
battery calculation.
Figure 4 : Typical Detector Circuit Wiring
A 6k8 end-of-line resistor (supplied in the accessory pack) must be connected across the
terminals of the last device on each circuit to allow the wiring to be line monitored for
open and short circuit faults.
Note: Unused circuits must have a 6k8 resistor fitted at the EP203 panel terminals.
The wiring for each detector circuit should be connected to the relevant 5mm connector
block on the Main Control PCB (Zone 1, Zone 2, or Zone 3) and their screens terminated
at the EP203 panel’s base earth post. For more specific device wiring information, refer
to the manufacturers’ own instructions.
Sounder Circuit Wiring
Note: See Appendix 4 (Technical Specification) for the sounder circuit specification.
The EP203 panel can power three conventional polarised sounder circuits at 19-28Vdc.
Each sounder circuit must be wired as a single, radial circuit with no spurs.
Figure 5 : Typical Sounder Circuit Wiring
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