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25
Cable types
A fire alarm installation is a safety system and it is important that the cables used are
suitable and of the correct types. Fire alarm cables should, when possible, be installed as
far as possible from mains power cables or any other cables that may generate noise or
have strong EMF in order to avoid disturbances from these cables.
The maximum cable length is dependent on cable type e.g. cross sectional area, units
current consumption, etc.
25.1
TLON Network cables
Cable specifications vary and are dependent on cable lengths e.g. 1.50mm
pair cable unshielded, Brooks stock no. BAC0989/200 (200 metre roll) or equivalent is
recommended. Cable specifications are given in drawing F738-01
See also separate TLON Technical manual.
25.2
COM loop cables
Loop topology is used for highest safety, i.e. the cable connected in FT1020G3, returns
back to FT1020G3. In case of a single break on the loop, communication starts in both
and a fault is generated, a fault message will also be displayed
directions
drawing F733, F784-01 and F784-02.
The cable length is dependent on the type and number of loop units, etc. See chapter
"FT1020G3 cable length calculation" page 170 and drawing number F733.
Note: For applications where the environment is noisy, screened cable is recommended.
If screened cable is used, the screen should be connected close to each loop unit
and only incoming (or outgoing) screen to the CIE earth point.
In order to maximise the COM Loop cable length, Brooks recommend using 7/0.52mm
2
(1.5mm
) twisted pair (shielded or unshielded) e.g. Brooks BAC0898 1.50mm
Twisted cable unshielded or equivalent.
When feeder line is required, use suitable multi core twisted pair cable
25.3
Remote Display Units cables
For RS-485, CAT5 (twisted) cable can be used, cable length < 1200 m to the furthest away
situated external EPU / AAU.
For 24V supply, Cable type Brooks BAC0898 1.5 mm
See "Cable Length Calculations for 1728 and 1736" page 172.
25.4
Conventional zone line cables
Zone expansion board 4580 and Multipurpose I/O unit 3361, recommended cable is Brooks
BAC0898 1.5 mm
25.5
Alarm device cables
Alarm devices (OWS, strobes, external sounders, etc.),
BAC0898 1.5 mm
165
For longest possible cable length Echelon recommends an unshielded cable type. However shielded cables can be used.
2
or equivalent. Refer to Table 14 below. See drawing F728 and F735.
2
twin TPS or equivalent unless fire rated cables required
168
Technical/Programming Manual
FT1020G3 Rev 2.2.1
2
TPS Twisted
165
, 738-02 and 738-03.
2
2
is recommended (or equivalent).
recommended cable is Brooks
. See
TPS 2 Core
2
.
1.5mm
.
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