Electrical installation
4.4 Introduction to EMC
Drive converter cabinet units
Operating Instructions, 07/07, A5E00288214A
49
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Figure 4-2 Definition of categories C1 to C4
Table 4-1 Definition of environments 1 and 2
Definition of environments 1 and 2
Environment 1 Residential buildings or locations at which the drive system is connected to
a public low-voltage supply network without a transformer.
Environment 2 Industrial locations supplied by a medium-voltage network via a separate
transformer.
Table 4-2 Definition of categories C1 to C4
Definition of categories C1 to C4
Category C1 Rated voltage <1000 V; unrestricted use in environment 1.
Category C2 Rated voltage for stationary drive systems <1000 V; for use in environment
2. For use in environment 1 only when sold and installed by skilled
personnel.
Category C3 Rated voltage <1000 V; use in environment 2 only.
Category C4 Rated voltage ≥1000 V or for rated currents ≥ 400 A in complex systems in
environment 2.
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