| This article describes the use of EOL (End Of Line) wiring schemes for wiring detectors.
Introduction
Grade 3 installations require the use of Fully Supervised Loop (FSL, EOL) wiring and as such higher specification alarm control panels have the ability to use this scheme of wiring. This involves the fitting of one or more resistors in the detector circuit such that different alarm events produce different resistance in the detector circuit. The control panel can differentiate these different resistances and generate the appropriate alarm type. This type of wiring eliminates the need for a separate tamper loop - i.e. only 2 cores are required for detector connection as opposed to 4 required for conventional Closed Circuit Loop (CCL) wiring.
The resistor values required to implement EOL wiring schemes are specific to the make and model of the control panel. Control panels which support FSL/EOL wiring are supplied with resistors of the correct value. Alternatively, detectors are available with the resistors in-built.
Terminology
The terminology for EOL wiring used by different manufacturers can be quite confusing.
Partially Supervised Loop
This type of wiring complies with Grade 3 installations.
Some control panels allow this type of wiring.
The resistance value below is purely an example, Always refer to the installation manual for the correct resistor values.
Fully Supervised Loop
The resistance values below are purely an example. Always refer to the installation manual for the correct resistor values.
Fitting Multiple Detectors per Zone.
Multiple detecors can be fitted to a zone. When fitting multiple detectors a resistor is fitted across each alarm swtch.
Fitting Resistors
The resistors should be fitted as close to the detector as possible.
A range of detectors pre-fitted with the required resistors is available. Magnetic contacts are available with the required resistors in the contact. Some PIRs are also available with the required resistors selectable on the PCB via jumper links - see the Pyronix KX series of PIRs
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