Date
26/6/2017
Document 923860006_09_006
Document code 923860006_09_006
Page 7 from 44
The first step to calculate the cross section of the cable is to calculate the current of each zone. You must add the
current of each luminary at 24VDC and multiply with
1.4 factor
. Then you pick the correct cross section cable from
the below table. For example, if you want to connect 10 luminaries with lamp 30L the current is 10*85mA = 0.850A
multiply 1.4 factor is 0.850A*1.4 = 1.19A. From the table, for a length less than 100m you must choose cable 1,5
mm
2
.
0.5 A
1 A
1.5A
2 A
2.5A
3 A
100m
1mm2
1mm2
1.5mm2
2.5mm2
2.5 mm2
4mm2
150m
1mm2
1.5mm2
2.5mm2
2.5mm2
4mm2
4mm2
200m
1mm2
2.5mm2
2.5 mm2
4mm2
4mm2
250m
1mm2
2.5mm2
4mm2
300m
1.5mm2
2.5mm2
4mm2
400m
2.5mm2
4mm2
500m
2.5mm2
4mm2
600m
4mm2
The values on the table are calculated when most of the load (luminaries) are placed at the end of the cable. It is
the worst condition.
It is better to connect the luminaries along the length of the cable.
You can use a star connection at the zone to reduce the voltage drop.
This is recommended to check the currents and the voltage drop when the installation is finish just for verification.
Olympia Electronics recommends the following cables:
1. NHXH FE180/E90.
2. YSLY-OZ
3. LiYCY with shield
2.3 Connecting luminaries on illumination zones
The connection of the luminaries is the same as common luminaries. Below you can see an example:
