Instruction manual

49
• Conduct insulation test at 500 VDC; the leakage current should not
exceed 0.25 mA.
• Carry out high voltage test at 1.5 kV AC/50 Hz. This voltage must
be maintained for 1 s without flash-over (i.e. leakage current <
10 mA).
The following are recommended alternatives for the luminaire
manufacturers (PM 333, PM 395):
• 100 % high voltage testing (insulation testing may be omitted) or
• 100 % insulation testing and 1-2% high voltage testing or
• testing by agreement with the testing authority (such as VDE,
KEMA, SEMKO)
3.13.1 Dielectric Resistance
in Lighting Systems
Dielectric resistance in lighting systems (> 0.5 MΩ) can be measured in
accordance with DIN VDE 0100 Part 600 Section 9 between:
a) The outer conductors (L1, L2, L3) and the protective
earth (PE) conductor
b) The neutral conductor (N) and the protective earth (PE)
conductor
c) The outer conductors (L1, L2, L3) among themselves
d) The outer conductors (L1, L2, L3) and the neutral
conductor (N)
The insulation test is performed at 500 VDC.
3.13.2 Mesuring the
Dielectric Resistance
between N and PE or
L and PE
(See picture in Section 3.10)
Tests are performed on new and existing installations. In existing
installations the test may be carried out without isolating the luminaire
approx. every two or three years.
There must be no electrical connection between the neutral conductor (N)
and the PE conductor. In this insulation measurement (500 VDC with
respect to PE), the neutral conductor isolating terminal should only be
disconnected if mains voltage is disconnected! Make sure the connection is
secure before reapplying mains voltage. Failure to observe these
instructions may lead to destruction of all the ECGs in the system due to
an unbalanced load and a resultant overvoltage.
Recommendation: 500 VDC = max. 1 mA measurement current
Measurement procedure:
• The ECG appears momentarily to have low resistance (charging of
the capacitors in the interference suppression filter).
• The ECG then appears to have high resistance.
An insulation fault in the lamp circuit does not affect the ECG.
The ECG will not be damaged by insulation tests provided a maximum
current of 1 mA is not exceeded (the measuring equipment must be
designed as a current source with an internal resistance of 500 kΩ).
Important:
Before using the lighting system, check for correct N conductor
connections! While the lighting system is in operation, never interrupt the
neutral conductor!