Instruction manual

39
Wiring 2-lamp QTi
To obtain good radio interference suppression, the PE conductor and the
line mains cables should not be lais parallel to the lamp cables or alongside
the ECG.
Due to the earth connection of the ECG to a metal plate ore the luminaire
body, an “internal” short circuit exists in luminaires of protection class I. It
means that the interference and leakage currents are redirected into the
ECG and, therefore, no so-called interference voltage are generated when
measuring conducted disturbances according to CISPR 15. The emitted
interference level of such a system is “low”.
3.8 Functional Earth for
Luminaires of
Protection Class II
In this case, the ECG is mounted in a plastic housing. Therefore, the
capacitive leakage currents generated by the system lamp and ECG are
not circulating within the luminaire, they are fed back into the mains supply
via the luminaire environment. The magnitude of these leakage currents
depends very much on the mechanical design of a luminaire and its
surroundings and on the specific features of the various lamp types
(FH
®
…HE or FQ
®
…HO) and hence can be very different. They cause
interferences on the mains side with regards to measurements of
conducted disturbances according to CISPR 15.
QTi 2x...
DA (+)
DA (–)
1
2
3
4
5
6
7
UN
21
22
23
24
25
26
27
L
L
QTi 2x...
DA (+)
DA (–)
1
2
3
4
5
6
7
UN
21
22
23
24
25
26
27
LL
LL
R
L N
Lampe
EVG
Radio interference:
9 kHz to 300 MHz
Low
R
L N
Lampe
EVG
Lamp
ECG
Metallic plate / metal reflector/ metal grid
9 kHz to 300 MHz
Low
Lam
p
EVG
Lam
p
ECG
R
L N
Plasics housing
Radio interference:
9 kHz to 300 MHz
High