Fire Detection System Planning Guide

Connection factors, line resistances and capacitances
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Siemens Building Technologies 007836_a_en_--.doc
Fire & Security Products 03.2004
16.4 Line resistance and capacitance
– The max. line resistance of the entire detector loop respectively from the detec-
tor furthest away to each of the two control unit connections must not exceed
150Ω .
– The entire line from the control unit to the equipment connected and back again
to the control unit as well as response indicator lines must be included when
working out capacitance.
DC1192
24VDC
E3M111
AB322A
EB322A
ABI322A
DC1192
DC1192
CB320A
24VDC
DC1192
24VDC
24VDC
max. R
max. C
Max. Resistance 150Ω (max. R)
Max. Capacitance 300nF (max. C) -> max. 600nF with max. 50Ω line resistance