Hardware Installation—Installing the IFC-1010/2020
89
Notes: • Place End-of-Line Resistor in series with supervision relay
contacts as shown on last detector in loop.
•
The power supervision relay coil leads must be connected to
the last detector base 24V screw terminal.
•
For additional ratings, refer Circuit/Device Ratings and
Connections Technical Bulletin (LIT-448160).
•
The M500MJ shown (when properly programmed) performs
the reset function for all smoke detectors connected to the IDC.
•
Maximum of 30 PWRC modules per loop.
•
Calculation of the maximum allowable resistance in the
24 VDC smoke detector power wiring:
Rmax = (20.6 – Vom)
(N)(Is) + (NA)(Ia) + (Ir)
Where:
Rmax- is the maximum resistance of the 24V wires.
Vom- is the minimum operating voltage of the detector or
end-of-line relay, whichever is greater, in volts.
N- is the total number of detectors on the supply 24V loop.
Is- is the detector current in non-fire alarm.
NA- is the number of detectors on the 24V power loop,
which must function at the same time in alarm.
Ia- is the detector current in alarm.
Ir- is the end-of-line relay current.
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