Fronius Symo 3.0-3-S Serviceanleitung Seite 128

Insulation resistance
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Ground conductor current
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Contact current
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128
The measuring voltage value shown on the measuring device must be at least the
same as the rated voltage to earth of the device to be tested, however it must be no
less than 500 V DC voltage.
The measuring current must be at least 1 mA (this corresponds to a load resistance
of 0.5 M).
The effective inner resistance of the ground conductor measuring device must not ex-
ceed 5 . In the event of higher resistances, measures must be adopted to prevent
dangerous contact voltages.
The measuring range must cover at least 0.25 mA to 19 mA.
The testing equipment must evaluate the measured current as an effective value re-
gardless of the curve form.
The effective inner resistance of the contact current measuring device must be 1 k
to 2 k.
Should the current measuring circuit be inadvertently connected to a voltage up to
120% of the nominal grid voltage, the user must not be put at risk and the testing circuit
must not be damaged.
The testing equipment must evaluate the measured current as an effective value re-
gardless of the curve form.