To comply with the IEC 61000-3-2 a measurement is required. If you use switched mode power supplies or transformers, the rectifier will distort the current wave. This results in harmonic levels that may exceed the max. allowed levels.
That means that each design must be verified to comply with these limits.
First you need to determine to which Class the device belongs. The different classes have different limits of harmonic currents.
Most equipment falls into Class A:
- Household appliances (not identified as Class D)
- tools (not portable)
- Dimmers for lamps
- Audio equipment
- Balanced 3-phase equipment
- Portable tools
- Arc welding equipment (non-professional)
- Lighting equipment
And for equipement witha specified power of <600W, Class D:
- Personal computers
- Television receivers
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