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Determination the cross-section of Datwyler Keram
cables for functional integrity E30 and E90
Tree-phase current
Voltage U
U in case of fire
Most part of the cable in
Simultaneous factor
Reduction ("only for
normal cables")
0,8
Cross section A (20°C) Uv 4,5%
Min. cross section A (30°C)
Load current Ib
more informations
14 | www.cabling.datwyler.com
(Factor resulting from ratio between the "cold" and "hot" lenght)
Lenght of approx. l
fire-section l
Conductivity χ at 20°
x Factor (F) E30 / E90
1,52
Minimum cross section A=
2,11
Minimum cross section A=
General Informations
and U at 3%
V cold to hot zone
for "normal" cables
Reduction factors for installation methods acc. DIN VDE 0298-4 must also be considered
Warning: Voltage drop calculation should, for example according
to DIN VDE 0298-4 higher cross-sections may be required, these should be used.
Power P
or
Load current I
b
coefficient V for E30
1,52
Company
Agent
Projekt
Back to „General"
Cable no.
8,21 mm²
11,39 mm²
coefficient V for E90
2,11
Note the VDS CEA policy for sprinkler systems
for E30
for E90
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