Aspirating Smoke Detector
Planning | en
77
Bosch Sicherheitssysteme GmbH
Operation Guide
2018.04 | 2.0 | F.01U.130.926
Line calculation
The maximum line length is derived from the permissible voltage drop on the supply line. The
permissible voltage drop is the difference between the end-point voltage of the backup
battery (21.5
V) and the lower operating voltage limits of the aspirating smoke detectors.
I
g
max
=
.
.
γ
L
∆
U
.
A
2
where
Lmax
=
Maximum line length in [m]
A
=
Strand cross-section in [mm²]
Ig
=
Total current of all connected aspirating smoke detectors in [A]
γ
=
Conductivity: Cu=57
m/Ω
mm²
ΔU
=
Charging current of the rechargeable batteries (80% of the nominal
capacity within 24
hours) in [A]
To guarantee the impermeability of the housing, the corresponding cable bushing must be
selected for the existing cable:
–
M
25 cable bushing:
∅
9-14
mm
–
M
20 cable bushing:
∅
8-12
mm
The "Fire Alarm System Planning Software" enables case-specific calculations to be carried out
for planning the FPA-5000 Modular Fire Panel.
Содержание FAS-420
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