Planning
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4.8.2
Determining the conductor cross-section
Danger
The conductor cross-section must always be determined and logged accordingly. Insufficiently
rated conductor cross-sections can result in malfunctions of the aspirating smoke detector.
Notice
When determining the required conductor cross-section, it is necessary to take into consideration not only the
ASD 532 power consumption but also the limit data of the line and FACP technology used.
As a rule, the conductor cross-section required for the ASD supply is also sufficient for the line. It is nevertheless
advisable to calculate the minimum line cross-section with the FACP-specific limit data (power consump-
tion/voltage drop).
The terminals of the ASD 532 are designed for maximum 2.5 mm². To feed the supply line on to a neighbouring
ASD it may therefore be necessary to install additional distributor or support terminals.
The current consumption of consumers operated on the OC outputs must be taken into account when the current
is calculated.
To ensure the ASD 532 is able to operate fault-free, the conductor cross-section must be rated so that the maximum required
power consumption is available in all cases at the end of the electric installation (i.e. at the ASD 532).
When determining the conductor cross-section, the highest possible power consumption by the ASD 532 during normal opera-
tion (after switching on) is the decisive factor. Due to its circuitry design, the ASD 532 has the highest power consumption at
the minimum supply voltage, i.e. at 14 VDC.
Below are the decisive conductor cross-section values of the ASD 532 (measured at peak fan speed):
•
Minimum wire diameter:
0.8 mm (0.5 mm²)
•
Maximum current consumption at:
14 VDC
-
ASD 532-1, ASD in alarm (
Al
)
200 mA
-
Additionally with RIM 36 (with 2 x RIM 36 = x 2)
30 mA
-
Additionally with XLM 35
15 mA
-
Additionally with SIM 35
15 mA
•
Maximum permitted voltage drop on the installation:
10 VDC
Calculation:
A =
I x L x 2
I
= Power consumption (in A)
L
= Single line length (in m)
γ
x
∆
U
2
= Factor for return line
γ
= Cu conductivity (57)
∆
U
= Voltage drop (in V)
Example 1,
ASD 532-1, line length 500 m:
Calculation:
A =
0.200 x 500 x 2
=
0.35 mm²
0.5 mm²
57 x 10
Example 2,
ASD 532-1 with XLM 35, line length 400 m:
Calculation:
A =
0.215 x 400 x 2
=
0.30 mm²
0.5 mm²
57 x 10
ASD532
Operating
Manual
Summary of Contents for ASD 532
Page 1: ...ASD 532 Aspirating Smoke Detector Operating Manual ...
Page 2: ...2 88 ASD532 Operating Manual ...
Page 6: ...6 121 ASD532 Operating Manual ...
Page 7: ...Document history 7 121 Document history First edition Date 15 10 2015 ASD532 Operating Manual ...
