4188-1075 issue 3_Part 2_08/14
4
Loop Loading
Loop Cable length
The loop cable length is de
fi
ned as the sum of the length of cable used on the main loop plus that used on all the spur circuits off
the main loop having system devices.
Loop device load and length calculations for 2Km loop card
The loop device load can be up to 200 devices and the Loop Cable length can be up to 2Km when using Loop Card (VIG-LPC-EN
or COMPACT-LPC-EN), where both device count and cable length are dictated by the number of alarm devices on the loop and
how they are positioned, distributed or lumped together.
Calculations to determine the Total alarm current
To determine the loop cable length and the number of devices that can be connected on up to 2Km loop the alarm current taken by
each device is required. So
fi
rst calculate the
total alarm current
using
Table 1
. Then use
Table 2
or
3 / 4 or 5
to trade between
the loop cable length and device count for lumped alarm device load.
To calculate the ‘Total Alarm Current’:
1. Enter in Table 1 column
the total number of each device type on a loop.
2. Multiply columns
x
to determine the alarm current for each device type.
3. Sum up all device type’s alarm current to
fi
nd out the
total alarm current
A
.
Table 1 - Total Alarm Current
Note some of the values in the table below may not be exactly the same as those in the Battery Standby and
Loop Load Calculator tool. The values are being used here as a rough guide to determine the total alarm
current.
Device part
number
Description
V
AD POWER
Maximum
limit
per loop
No. of
Devices
on loop
Alarm
current (mA)
per device
Alarm
current
x
VIG-RPT-72
Repeat panel
4
______ x 1.20
VIG-MIM-A3
A3 Zonal/Mimic panel
4
______ x 1.20
S4-720
Heat Sensor
200
______ x 0.20
S4-710
Optical Heat Sensor
200
______ x 0.20
S4-711
Dual Optical Heat
Sensor
200
______ x 0.20
S4-770-S
Optical Heat Turbo
Sounder
177
______ x 4.5
Optical Heat Non
Turbo Sounder
200
______ x 2
S4-771-S
Dual Optical Heat
Turbo Sounder
177
______ x 4.5
Dual Optical Heat
Non Turbo Sounder
200
______ x 2
S4-780-S
Heat Turbo Sounder
177
______ x 4.5
Heat Non Turbo
Sounder
200
______ x 2
S4-711-VAD-HPW
Dual Optical Heat
Turbo Voice & White
VAD
L
M
H
76
50
39
______ x
______ x
______ x
10.5
15.8
20.25
Dual Optical Heat
NonTurbo Voice &
White VAD
L
M
H
100
60
45
______ x
______ x
______ x
8
13.3
17.75
S4-711-VAD-HPR
Dual Optical Heat
Turbo Voice & Red
VAD
L
M
H
76
50
39
______ x
______ x
______ x
10.5
15.8
20.25
Dual Optical Heat non
Turbo Voice & Red
VAD
L
M
H
100
60
45
______ x
______ x
______ x
8
13.3
17.75
S4-711-V
Dual Optical Heat
Turbo Voice
177
______ x 4.5
Dual Optical Heat non
Turbo Voice
200
______ x 2
S4-711-VAD-HPW
Dual Optical Heat &
White VAD
L
M
H
133
70
50
______ x
______ x
______ x
6
11.3
15.75
Key
X - Signify colour: R - Red &
W - White of product
body and strobe light
x - Signify multiply by
~ - A maximum of up to 100
input channels are
allowed per loop.
* - Applicable when sounder
is operating in turbo mode
or with a bell tone.
# - 8 maximum if outputs are
sectored
LV - Low voltage
MV - Medium voltage
L - Low power Visual Alarm
M - Medium power Visual
Alarm
H - High power Visual Alarm
S - Standard power Visual
Alarm
