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Loop Cable length
The loop cable length is defi 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
2. Multiply columns
3. Sum up all device type's alarm current to fi nd out the total alarm current
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
VIG-RPT-72
VIG-MIM-A3
S4-720
S4-710
S4-711
S4-770-S
S4-771-S
S4-780-S
S4-711-VAD-HPW
S4-711-VAD-HPR
S4-711-V
S4-711-VAD-HPW
4
the total number of each device type on a loop.
x
to determine the alarm current for each device type.
Description
Repeat panel
A3 Zonal/Mimic panel
Heat Sensor
Optical Heat Sensor
Dual Optical Heat
Sensor
Optical Heat Turbo
Sounder
Optical Heat Non
Turbo Sounder
Dual Optical Heat
Turbo Sounder
Dual Optical Heat
Non Turbo Sounder
Heat Turbo Sounder
Heat Non Turbo
Sounder
Dual Optical Heat
L
Turbo Voice & White
M
VAD
H
Dual Optical Heat
L
NonTurbo Voice &
M
White VAD
H
Dual Optical Heat
L
Turbo Voice & Red
M
VAD
H
Dual Optical Heat non
L
Turbo Voice & Red
M
VAD
H
Dual Optical Heat
Turbo Voice
Dual Optical Heat non
Turbo Voice
Dual Optical Heat &
L
White VAD
M
H
Maximum
No. of
limit
Devices
current (mA)
per loop
on loop
per device
4
______ x
1.20
4
______ x
1.20
200
______ x
0.20
200
______ x
0.20
200
______ x
0.20
177
______ x
4.5
200
______ x
2
177
______ x
4.5
200
______ x
2
177
______ x
4.5
200
______ x
2
76
______ x
10.5
50
______ x
15.8
39
______ x
20.25
100
______ x
8
60
______ x
13.3
45
______ x
17.75
76
______ x
10.5
50
______ x
15.8
39
______ x
20.25
100
______ x
8
60
______ x
13.3
45
______ x
17.75
177
______ x
4.5
200
______ x
2
133
______ x
6
70
______ x
11.3
50
______ x
15.75
A
.
Alarm
Key
Alarm
current
x
X - Signify colour: R - Red &
x - Signify multiply by
~ - A maximum of up to 100
* - Applicable when sounder
# - 8 maximum if outputs are
LV - Low voltage
MV - Medium voltage
L - Low power Visual Alarm
M - Medium power Visual
H - High power Visual Alarm
S - Standard power Visual
4188-1075 issue 3_Part 2_08/14
Loop Loading
W - White of product
body and strobe light
input channels are
allowed per loop.
is operating in turbo mode
or with a bell tone.
sectored
Alarm
Alarm
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