FT2GAS
Gaseous Extinguishing System
Rev No. 1.3
40
I
Q
= Total system quiescent current in Ampere
T
Q
= Quiescent standby power source time, normally 96 hours (non-monitored systems) and
24 hours (monitored systems)
F
C =
Capacity de-rating factor, typically 2
I
A
= Total system alarm current in Ampere
T
A
= Alarm load standby power source time, normally 0.5 hour
Note:
In most of the applications, the output required to discharge the gas is only instantaneous i.e. a
few seconds. From Table 22, one minute is long enough to supply the current (up to 5A) to fire the
discharge device.
WARNING
: Check the datasheets of the gas initiating devices and the application requirements
carefully.
Typical example
FT2GAS is supplied with 12AH batteries and 150W power supply. Assume a gaseous extinguishing
system required protecting a risk area with 3 entries, the following equipment may be installed:
1 x FT2GAS
3 x LCS
3 x “Fire Alarm / Do Not Enter” Signs
3 x “Fire Alarm / Evacuate” Signs
3 x “System Inoperative” Signs
Optional 6 x speaker/horn tone and voice sounder
From Table 22,
I
Q
for a standard FT2GAS system = 75 mA
