400 Technical data Category C2The emission limits are complied with the following provisions:1. The optional EMC filter is selected according to the ABB documentation andinstalled as specified in the EMC filter manual.2. The motor and control cables are selected as specified in this manual.3. The drive is installed according to the instructions given in this manual.4. Motor cable length maximum 30 m (100 ft) with 4 kHz switching frequency.Note: In a domestic environment, this product may cause radio inference, in whichcase supplementary mitigation measures may be required. Category C3The immunity performance of the drive complies with the demands of IEC/EN 61800-3, second environment (see page 399 for IEC/EN 61800-3 definitions).The emission limits are complied with the following provisions:1. The internal EMC filter is connected (the metal screw at EMC is in place) or theoptional EMC filter is installed.2. The motor and control cables are selected as specified in this manual.3. The drive is installed according to the instructions given in this manual.4. With the internal EMC filter: motor cable length 30 m (100 ft) with 4 kHz switchingfrequency.Notes:• A drive of category C3 is not intended to be used on a low-voltage public networkwhich supplies domestic premises. Radio frequency interference is expected ifthe drive is used on such a network.• It is not allowed to install a drive with the internal EMC filter connected on IT(ungrounded) systems. The supply network becomes connected to groundpotential through the EMC filter capacitors which may cause danger or damagethe drive.• It is not allowed to install a drive with the internal EMC filter connected on a cornergrounded TN system as this would damage the drive.
