WAGNER TITANUS, Техническое руководство, Страница: 86 / 208

Pipe Design TITANUS MICRO·SENS
®
4 – 36
Data: 01/09 MS_A_04-en-e
Line calculation The maximum line length results from the permitted line drop on the feed.
The permitted line drop is the difference resulting from the stand-by ac-
cus discharge voltage (21.5 V) and the lower operating voltage limit of
the aspiration smoke detection system.
2
⋅
⋅ Δ ⋅
=
total
max
I
A U
L
γ
L
max
= Maximum line length in [m]
A = Wire cross-section in [mm²]
I
total
= Total current of the aspiration smoke detection system in [A]
γ
= Conductivity: Cu=57m/
Ω
mm²
Δ
U = Max.line drop on the feed
To guarantee the tightness of the housing seal, the appropriate cable
throughput for the particular cable must be selected.
z
M 25- cable throughput:
∅
9 to 14 mm
z
M 20- cable throughput:
∅
8 to 12 mm
Emergency Supply
Calculation The nominal capacity is calculated by means of the following formula:
25 . 1 ) 5 . 0 (
⋅ ⋅ + ⋅ ⋅ =
h I t n I K
total quiescent nominal
K
nominal
= nominal capacity of the emergency supply accumulators [Ah]
t = required bridging time [h]
The factor 1.25 in the equation is only to be observed if bridging times
are smaller equal to [sic] 24 hours.