Installation Manual
Connections 33
Chapter 7
Connections
7.1 Note to the Installer regarding wiring and connection compliancy
7.1.1 Two wire connection
For a system that is EN54 compliant, no more than 32 sensors can be connected when this type of
wiring is used.
7.1.2 Four wire connection
For a system that is EN54 compliant, an insulation module must be installed for each group of 32
detectors (refer to paragraph B.14 Modules with Isolators for information regarding the devices with
built-in isolators). T junction connections are prohibited.
Fire code guidelines
Danger: If you are using a 2 wire connection, no more than 32 detectors can be connected to the
loop.
If you are using a 4 wire connection, T junctions are prohibited, that is unless the
maximum number of devices that risk isolation during any type loop fault does not
exceed 32.
If the system loop devices do not have built-in isolators, you must install an isolator for
each group of 32 detectors. Refer to “Appendix B” and “Appendix B” for further details.
All circuits should be wired using the local country Fire Code compliant method.
7.2 About the circuitry
The fire alarm system circuitry is critical to the safety and well being of the building occupants. It is
considered an essential communication path during evacuation or relocation of persons during a fire
or emergency situation. During such an event, it is critical for fire safety equipment such as fire alarm
signaling equipment to remain operational for a specified amount of time. Therefore, all circuits are to
be wired using the local country Fire Code compliant method.
7.2.1 Guidelines
• The fire alarm system circuitry must not be commingled without proper separation, and must be
kept separate from all other wiring.
• Junction boxes are required at splice points. All Junction boxes must be installed using the local
country Fire Code compliant method.
• Any wires/cables inside the SmartLoop cabinet must be secured to the cable hooks on the back box
by means of plastic cable ties or similar fittings.
• The mains power supply cable must enter the control panel cabinet through the appropriate cable
entry and must not cross other conductors. The mains power supply cable must be secured to the
cable hook on the back box by means of a plastic cable tie.
7.2.2 Connection flow
1. Loops
2. NAC 1, 2, 3 - Alarm NAC - Fault Output
3. Fault relay
4. Alarm relay
5. Aux, AuxR terminals (power supply outputs for ancillary devices)
6. PL terminal board
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