GE Security EST3 User Manual

System calculations
B.14 EST3 Installation and Service Manual
Equation method
Appliance operating voltage and current
Regulated notification appliances have an operating range from
16 V to 33 V. Use 16 V as the minimum appliance voltage when
using regulated notification appliances.
When using unregulated notification appliances, refer to the
installation sheets to determine the minimum appliance voltage
required.
What if there are different types of appliances in the NAC, and
each type has a different minimum operating voltage? In this
case, use the highest minimum voltage required by any
appliance.
The total current requirement for the appliances will be the sum
of the individual maximum currents drawn by each appliance
when using DC power. Use the maximum current for the
appliance over the 16 V to 33 V range.
If all appliances draw the same maximum current, the total
current is the maximum current multiplied by the number of
appliances. If different appliance types have different maximum
currents, the total current is the sum of the maximum current for
each appliance type multiplied by the number of appliances of
that type.
Wire resistance
Typical wire resistances are shown in the following table.
Table 4: Typical wire resistances
Wire
gauge
(AWG)
Resistance
1 strand uncoated
copper
Resistance
7 strand uncoated
copper
Ω per foot Ω per meter Ω per foot Ω per meter
12 0.00193 0.00633 0.00198 0.00649
14 0.00307 0.01007 0.00314 0.01030
16 0.00489 0.01604 0.00499 0.01637
18 0.00777 0.02549 0.00795 0.02608
When performing these calculations, always refer to the actual
cable supplier documentation and use the actual Ω/ft (or Ω/m)
for the cable being used.

GE Security EST3 Specifications

General

Brand	GE Security
Model	EST3
Category	Security Sensors
Language	English