Brooks Firetracker FT128 CIE - Table 15 Summary of Recommended Cables

Technical / Programming Manual
FT128 Rev 2.2
163
Since the COM loop cable length is dependent on the number of units and their current
consumption the figure in the table is for the maximum number of COM loop units i.e. 255
units and 350mA.
Table 15 below summarises the different cable types required and the maximum cable
length allowed.
Table 15 Summary of Recommended Cables
Connection type
Cable type
Conductive
surface area
Resistance/km
Cable
length
Com Loop
Twisted pair
1.5mm
2
11.9 Ω/km
1300m
Conventional Zone
Flat pair
1.5 mm
2
11.9 Ω/km
1000m
1mm
2
24 Ω/km
650m
Alarm Devices
Flat pair
1.5 mm
2
11.9 Ω/km
1000m
1mm
2
24 Ω/km
650m
Display Units (RS485)
CAT5 for data
0.5 mm
2
0.5 mm
2
1200m
Twisted pair for power
1-1.5 mm
2
1-1.5 mm
2
1200m
Other cables
Flat pair
1mm
2
24 Ω/km
650m