EST LSS4 - Page 106

System
C
alculation
s
Battery
C
alculatio
n
s
A2
Introduction
NFPA
standard72
specifiesthe
secondary
pow'er
supply
capacities
for
exh
shall
type
system.
Under
maximum
normal
load,the
secondary
supply
operate
localand
proprietary
systemsfor24
hours,and
auxiliary
and
remote
station
systemsfor60
hours.At theendofthe
standby
period.the
secondary
supply
shallbe
capableof
operating
with
10*cof
the
Initiatin_•
Device
Circuits
activaledand
operating
all
alarm
notification
appliancesfor5 minutes.
Therearetwo
methodsof
determiningthe
sizeof
battery
required.
Table
A-
1,
Table
A-2,and
TableA-3
_=ive the
required
battery
sizefor
given
panel
loadsand
standby
times.For
conditionsnot
coveredbythe
tables,
the
calculation
method
mustbe
used.In
either
case,the
Battery
Calculation
worksheet
mustbe
filledout
first.
Battery
Calculation
Worksheet
TheLSS4
BatteryCal
culation
worksheet,
WorksheetA-
1,
is
usedto
determmethe
stnndbyand
alarm
current
requirementsofthe
paneland
all
its
accessories.
When
usinga
common
batteryto
supply
all
standby
power.
fill out
all
applicable
line
itemintheworksheet.Ifthepanel
uses
separale
batteriesto
backupthe
auxiliary
power
supplies,
copythe
worksheetand
fil1 out
line
items9a,9b,and9cfor
each
auxiliary
power
supply
poweredby
its own set of
batteries.
Refertothe
Power
Manaeement
sectionin
Chapter1 for
additional
information.
LSS4
Installation,
Operation,and
Maintenance
Manual