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User Manual 5.32 (2018-05) 31
Subject to change
Series EK92
EK90 smoke control dampers
Electrical connection (2) Notes for electrical installation and power supply
Notes for electrical installation
•
Smoke control dampers should also be able to open and close when
exposed to fire.
•
For this reason, an electrical power supply functions in the event of fire
and has suitable connection cables up to the smoke control dampers is a
requirement.
Electrical cables, class E90, with functional integrity of 90 minutes should
be used. The minimum requirement is functional integrity of 30 minutes
and classification E30.
However, the classification tests relate only to short-circuit resistance and
power failure in the event of fire though.
•
The electrical resistance in the connection cable increases when exposed
to fire because of the increased temperature; up to 2.6-fold after 30 min-
utes and up to 4.6-fold after 90 minutes.As a result, the electrical voltage
drop increases while the remaining voltage on the motor drives falls.
When dimensioning the connection cables, this should be factored in with
large cross-sections, shorter lengths or a higher electrical operating volt
-
age accordingly.
The same applies to connection cables for operating voltages with multi
-
plexed data transmission; for example, AS-i and other BUS systems.
Otherwise, smoke control dampers could not open or close as they are
supposed to in the event of fire.
•
Correct dimensioning of the connection cables and operational safety of
data transmission cannot be stressed enough!Likewise, attention must be
paid to the prescribed type of laying and installation for electrical cables
and their functional integrity!
•
It is generally recommended that smoke control dampers be used
for 230 V AC and connected via E90 cables with 1.5-mm² conductor
cross-section.
The length of said E90 cables can be 250 m or more. Otherwise, only
short connection cables may be possible.
Additional switching equipment should be installed in a fireproof room or
switch cabinet.
Power supply
•
Mechanical
systems for smoke
extraction
require a reliable power
supply in the event of fire.
A power supply, as provided by
power generation equipment
(backup power), in addition to
the public power grid conforms to
requirements under public law.