
Installation
and
Operation
Manual
61
Appendix
‐
D:
Battery
Calculations
Total
System
Currents
Calculations
Table
19
System
Currents
Calculation
IMPORTANT
NOTICE
The
main
AC
branch
circuit
connection
for
Fire
Alarm
Control
Unit
must
provide
a
dedicated
continuous
power
without
provision
of
any
disconnect
devices.
Use
#12
AWG
wire
with
600
volt
insulation
and
proper
over
‐
current
circuit
protection
that
complies
with
the
local
codes.
For
specifications,
refer
to
the
Specifications
and
Features
section.
Functional
Unit's
Currents
(All
currents
are
in
ampere)
Model
Number
Description
Qty
Standby
Total
Standby
Alarm
Total
Alarm
FW201/FW201C
AMI
1
× 0.143
0.146
FW391
PTU
1
× NA
NA
FW397
PCU
1
× 0.065
0.065
FW327
ALU
× 0.027
0.027
FW337
NOU
× 0.036
0.054
FW347
ROU
1
× 0.035
0.035
FW357
XNU
× 0.027
0.027
Field
Devices
Currents
(All
currents
are
in
ampere)
The
total
quantities
of
each
loop
must
<=
252.
The
total
current
of
field
devices
per
loop
is
100
mA
@standby,
and
220
mA
@alarm.
FW511
Optical
Smoke
Detector
× 0.00014
0.001
FW521
Heat
Detector
× 0.0001
0.001
FFW721
Manual
Station
× 0.0001
0.001
FW721C
Manual
Station
(Canada)
× 0.0001
0.001
FW811
Input
Module
× 0.00017
0.00079
FW821
Input
‐
Output
Module
× 0.00015
0.00026
FW831
Relay
Module
× 0.00015
0.00026