Drive of category C2: drive of rated voltage less than 1000 V and intended to be installed
and started up only by a professional when used in the first environment. Note: A professional
is a person or organization having necessary skills in installing and/or starting up power
drive systems, including their EMC aspects.
Drive of category C3: drive of rated voltage less than 1000 V and intended for use in the
second environment and not intended for use in the first environment.
Drive of category C4: drive of rated voltage equal to or above 1000 V, or rated current equal
to or above 400 A, or intended for use in complex systems in the second environment.
￭ Category C3
The drive complies with the standard with the following provisions:
1. The input power cables, motor cables and control cables are selected as specified in
the appropriate drive manual(s).
2. The drive is installed according to the instructions given in the appropriate drive
manual(s).
3. Maximum motor cable length is 100 meters (328 ft).
WARNING!
A drive of category C3 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.
￭ Category C4
If the provisions under Category 3 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.
Medium voltage network1
Neighboring network2
Point of measurement3
Low voltage4
170 Technical data
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