OSRAM QUICKTRONIC INTELLIGENT DIM CFL - Manual (Page 21)

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2.5.4 Requirements to be met by the transmission cable
When selecting a cable make sure that the voltage drop on the line
does not exceed 2 V at 250 mA. As with 1…10 V systems, the power
supply and control line can be run in the same cable. This means, for
example, a 5-core NYM cable can be used to connect the DALI ECG
without any problems. The maximum permitted total length of cable
between the controller and the connected ECG is 300 m.
Cross section of the power cable:
A = L x I x 0.018
A = Line cross section in mm², L = Cable length in meters,
I = Max. current of the supply voltage in A,
0.018 = Specific resistance of copper
The following formula is used as a basis for finding the cable cross
section (transmission and power cable):
Line length up to 100 m 100 to 150 m 150 to 300 m
Line cross section 0.5 mm 2 0.75 mm 2 1.5 mm 2
Note:
Because of the different technical properties of the DALI interface in
control units found on the market and the differing local conditions of
the installation, it is recommended to limit the overall line lengths used
in the system to 300 m.
2.5.5 Wiring diagram for DALI ECGs
For reasons of clarity it is recommended to use the black and the gray
cable for DALI.
e.g.
Neutral conductor
Protective earth
Figure 9: Wiring diagram for DALI controllers