Sharp QT-80W Instruction Manual download pdf (Page 50)

• 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!

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Sharp QT-80W Instruction Manual Page 50

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