Sensors And Modules - Notifier ID50 Installation, Commissioning & Configuration Manual

ID50 Series Panel - Installation, Commissioning & Configuration Manual
EN54-2 : 12.5.2
Maximum of 32
Sensors and/or MCPs
between isolators
NEVER use a high
voltage tester on
the loop

4.8 Sensors and Modules

Each of these devices is packaged with an instruction
leaflet showing the correct interconnections for various
applications.
4.8.1 EN54 Requirements
Isolators
Isolators must be used on the analogue loop to separate
sensors and/or MCPs, including any conventional zone
detectors and/or MCPs connected.
To comply with the requirements of EN54-2, isolators
should be fitted between a maximum of 32 loop devices.
For this panel, do not place more than 25 loop devices
between isolators (20 if FET isolators are used).
Failure to comply contravenes the requirements of
EN54-2 in the event of a transmission path fault.
4.8.2 Loop Wiring Testing
Before connecting the panel or devices, the wiring of the
loop may be tested for continuity and insulation. Once
any components are connected, including isolators, no
high-voltage testers such as Meggers may be used on
the loop; low-voltage testers such as multimeters may
be used.
Note: If isolators are fitted, the +ve conductor of the loop
will be open circuit.
35 997-263, Issue 4
September 2002