GR-750x series
Control panel for addressable emergency
luminaires
Document number: 923750400_09_007
Date: 3/5/2022
Page: 19 of 71
[19]
3.3 Point wiring
Use a cable that meets these specifications, to connect the loop board with the points:
1.
Two−core shielded twisted pair cable. If the cable is unshielded, the communication between the loop
and the points is susceptible to electromagnetic interferences.
2. No more than 2 cores.
3. Low resistance, less than 25 Ohm/km. The total impedance of each core of the cable should not be
more than 20 Ohm.
4. Wire cross section should
be between 0,7mm² and 2,5mm².
5. Low capacitance, less than 200pF/m. The total capacitance of a single cable should not exceed
800nF.
Table 7
– Recommended cable cross section
Loop cable length
200m
500m
1000m
1500m
2000m
P
o
int
nu
mb
er
50
0.75 mm
2
1 mm
2
1 mm
2
1.5 mm
2
2.5 mm
2
100
1 mm
2
1 mm
2
1.5 mm
2
1.5 mm
2
2.5 mm
2
150
1.5 mm
2
1.5 mm
2
2.5 mm
2
2.5 mm
2
2.5 mm
2
200
1.5 mm
2
1.5 mm
2
2.5 mm
2
2.5 mm
2
2.5 mm
2
250
1.5 mm
2
1.5 mm
2
2.5 mm
2
2.5 mm
2
2.5 mm
2
We recommend LiYCY (TP) type cables with cross section from 0.75mm
2
to 1.5mm
2
or YSLYCY-JZ with cross
section from 1mm
2
to 2.5mm
2
, depending on the number of connected points, topology of the installation and
cable length.
WARNING
The maximum length of a single loop cable should not exceed 2000m. The maximum
connected points per loop are 250.
The upper and lower cable openings of the metallic enclosure of the panel can be used to drive the cables
through. The rubber plugs should not be removed from the openings, so the ingress protection IP30 remains
unchanged. Instead pierce a hole on the rubber plug, big enough to barely fit the cable and drive the cable
through it. To connect one or more points to the loop output terminals, remove the short-circuit adapter.
IMPORTANT
1.
The cable’s shield must be reconnected in every cut throughout the length of the loop
and must be connected to the earth bar of the panel.
2. The positive and negative polarity must be maintained throughout the length of the
loop.
3.
All points must be connected in parallel with the output.
4. If the number of installed points in on a loop circuit exceeds 50, or if the length of its
cable exceeds 500m, then a closed loop connection topology is always recommended,
to minimize communication issues.