Appendix G Conformity with Standards
Appendix-33
■ Leakage current of EMC-filter built-in type of inverters
An EMC filter uses grounding capacitors for noise suppression which increase leakage current. The use of
grounding capacitors leads to an increase in leakage current, and therefore a check should be carried out to ensure
that the power supply system has not been affected.
As the touch current (leakage current) of inverters with EMC-filter is relatively high, it is of essential importance to
always assure a reliable connection to Protective Earth (PE). (Current values are shown in Table G.1-3.)
In Table G.1-3, for the inverter types whose leakage currents are equal to or exceed the critical value of 3.5 mA
AC or 10 mA DC (IEC 61800-5-1), the minimum cross sectional area of the PE-conductor should be:
• 10 mm
2
(Cu-conductors)
• 16 mm
2
(Al-conductors)
Failure to observe this could result in electric shock.
Table G.1-3 Leakage current of EMC filter built-in type of inverters
*1) Calculated based on these measuring conditions: 480 V/60 Hz, neutral grounding,
interphase voltage unbalance ratio of 2%.
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