Amprobe Telaris-ISO-PRO Insulation-Tester - Manual (Page 11)

General Information regarding Insulation Measurement
For electrical installations the insulation measurement has to be carried out prior to final
commissioning. This measurement is of basic importance as the insulation measurement
(protection against dangerous body currents) is considered to be the only measurement for
fire protection. If, due to an insulation error, a limited fault current flows between two
conductors, this leads to a heating up or even to a fire. Only the insulation measurement
procedure can detect such a fault.
According to DIN VDE 0100 Part 610 the insulation resistance measurement is carried out:
• from all external conductors (e.g. B. L1, L2, L3) towards ground or towards the grounded
protective earth (PE)
• between protective earth (PE) and neutral (N)
Additionally, it is advised to perform the following measurements:
• between all active conductors (e.g. L1, L2, L3, N).
This measurement has to be carried out separately for every individual current circuit. This
measurement is performed using a DC voltage of 500 V.
Table 1 Test Voltages
9
Description of the System Nominal voltag Test Voltage Limit Value
Test of other signal systems 50 V -
Derivation ability of floor covering in compliance with
DIN 51953 100 V 1 M
Ω
SELV / PELV system 250 V 0.25 M
Ω
Systems up to 500 V (except SELV /PELV) 500 V 0.5 M
Ω
Systems above 500 V up to 1000 V 1000 V 1M
Ω
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