OSRAM QUICKTRONIC INTELLIGENT DIM CFL - Manual (Page 15)

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2.4.3 Radio interference suppression of dimmable luminaires
The use of dimmable ECG is only approved in luminaires of protection
class I (PC I) as only here is adequate grounding assured.
Note:
When dimming, the operating frequency of the lamp and the lamp
burning voltage increases at the same time which can lead to elevated
leakage currents. Leakage currents emerging from the lamp always
flow back into the ECG because the current circuit must be closed. To
keep cable-related interference as low as possible, the leakage cur-
rent is offered a different return path, the ground conductor (=casing)
and the PE connection of the ECG.
In brief: Dimming is not possible without grounding. Dimmable ECGs
only function in PC I luminaires and not in PC II luminaires as these
have no protection contact. Connecting the dimmable ECG to the
functional ground is not permissible.
R
L N
R
L N
Lamp
ECG
PE
Radio interference suppression with PC I
Grounded metal plate or reflector
Figure 5: Protection class I luminaires
The maximum 50 Hz leakage current of the ECG via the ground fault
circuit interrupter (FI switch) is 0.5 mA.
• Mains cables and control lines may be routed together and should
be laid close to the luminaire wall
• Mains and control cables must not be laid close to the lamp cables
• If crossovers of mains and lamp cables are unavoidable, they
should cross perpendicularly
• Do not lay the PE conductor together with the lamp cables
• Do not use shielded lamp cables (reduction of capacity leakage
currents)
• The OSRAM DALI/DIM ECG must always be installed near the
lamp(s) so that the lamp cables can be kept short in the interests of
good radio interference protection