Technical data
168
Category C4
If the provisions under Category C3 cannot be met, the requirements of the standard
can be met as follows:
1. It is ensured that no excessive emission is propagated to neighbouring low-
voltage networks. In some cases, the natural suppression in transformers and
cables is sufficient. If in doubt, the supply transformer with static screening
between the primary and secondary windings can be used.
2. An EMC plan for preventing disturbances is drawn up for the installation. A
template is available from the local ABB representative.
3. The motor and control cables are selected as specified in chapter Planning the
electrical installation.
4. The drive is installed according to the instructions given in chapter Electrical
installation.
WARNING! A drive of category C4 is not intended to be used on a low-voltage public
network which supplies domestic premises. Radio frequency interference is
expected if the drive is used on such a network.
Low voltage
Equipment
Low voltage
Equipment
Equipment
(victim)
Supply transformer
Medium voltage network
Static screen
Point of measurement
Drive
Neighbouring network
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