TITANUS
SUPER·SENS
®
Pipe
Design
TSS_04_A-en-e
Data: 02/09
4 –
43
Line calculation
The maximum line length results from the permissible drop in voltage on
the input line. The permissible drop in voltage is the difference of the final
discharging voltage of the emergency power battery (21.5 V) and the low-
ermost operating voltage limit of the air sampling smoke detection sys-
tems.
2
max
⋅
⋅
Δ
⋅
=
total
I
A
U
L
γ
L
max
= maximum length of line in [m]
A = cable cross sectiont in [mm²]
I
total
= total current of air sampling systems in [A]
γ
= conductivity: Cu=57m/
Ω
mm²
Δ
U = max. voltage drop of the feeding line
A suitable cable feed through should be selected for the existing cable in
order to ensue that the housing is tight.
z
M 25- cable feed through:
∅
9 to 14 mm
z
M 20- cable feed through:
∅
8 to 12 mm
Emergency power
calculation
The nominal capacity is calculated using the following formula:
25
.
1
)
5
.
0
(
min
⋅
⋅
+
⋅
⋅
=
h
I
t
n
I
K
total
quiescent
al
no
K
nominal
= nominal capacity of emergency power batteries [Ah]
t = required bridging time in [h]
The factor 1.25 of the equation is only relevant in case of a bridging time
of 24 hours or less.
