Consilium CFD5000 T/CM2.2 - Loop Lengths

5Electrical Installation Installation & Commissioning Manual
16
5100607_CFD5000 T - CM2.2_Installation & Commissioning Manual_T_EN_2023_F
No redundancy (Channel 1)
•
Min 1 x 3 x 0.5 mm
2
, twisted pair shielded
•
Max allowed cable length is 700 m
General information
•
Max allowed cable length is max 700 m according to RS-485
NOTE!
Channel 1 and Channel 2 should be routed separately for improved safety.
Detector loops
CAUTION!
It is strongly recommended to use halogen free cables for loop lines and connections
to external systems.
Detector loop cables must meet the following minimum requirements:
Loop: Min. 2 × 0.3 mm²
Sub loop: Min. 2 × 0.3 mm²
This is the minimum cable diameter that the fire detection system can handle.
International rules and regulations must be followed with regard to cable diameter.
5.2.3 Loop lengths
A loop or sub-loop's length depends on three parameters:
•
cable type
•
shielded or unshielded cable
•
power consumption
Maximum loop line cable resistance on the positive side is 53 Ω.
1. Connect an ohmmeter to the + poles on the loop-line.
NOTE!
All loop units have a built-in short circuit isolator (SCI), therefore
always measure between the + poles.