Specifications

Calculations C
SHM80001
SAFETY HI-TECH
Quaestor-SZU Releasing Fire Control Panel - Installation and Operation Manual
Revision E03.04
110 of 155
The figure below illustrates an example circuit for determining maximum wire length where values are provided for
minimum operating-voltage of the NAC channel output (Vopmin), maximum current of the circuit (Imax),
wire-resistance-per-foot of the circuit (Rwire) and maximum current-draw of the strobe (Istrobe):
Figure C-1
Example Circuit For Determining Maximum Wire Length
NAC2NAC1
Fire In Zon
Supervised EOL
resistor, VF1895-00
VF1895-00
10K
EOL resistor
Vop
min
L
max
= 548 FT
+
++
+
.209 A
I
strobe
.209 A
I
strobe
.209 A
I
strobe
-
+
-
+
-
+
-
+
Example circuit identifies wire
length for two conductor cable
V
outmin
measured across
NAC1 terminals