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C3: Rated voltage lower than 1000 V, applied to environments of Category II. They cannot be applied
to environments of Category I.
C4: Rated voltage higher than 1000 V, or rated current higher or equal to 400 A, applied to complex
systems in environments of Category II.
B.6.1 VFD category of C2
The induction disturbance limit meets the following stipulations:
1. Select an optional EMC filter according to Appendix D and install it following the description in the
EMC filter manual.
2. Select the motor and control cables according to the description in the manual.
3. Install the VFD according to the description in the manual.
4. For the maximum length of the motor cable when the switching frequency is 4 kHz, see Section
B.4.1 "EMC compatibility and motor cable length".
B.6.2 VFD category of C3
The anti-interference performance of the VFD meets the requirements of environments Category II in
the IEC/EN 61800-3 standard.
The induction disturbance limit meets the following stipulations:
1. Select an optional EMC filter according to Appendix D and install it following the description in the
EMC filter manual.
2. Select the motor and control cables according to the description in the manual.
3. Install the VFD according to the description in the manual.
4. For the maximum length of the motor cable when the switching frequency is 4 kHz, see Section
B.4.1 "EMC compatibility and motor cable length".
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