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Table 4- 2
Category C1
Category C2
Category C3
Category C4
4.5
EMC-compliant design
The following section provides some basic information and guidelines that will help you
comply with the EMC and CE guidelines.
Cabinet assembly
● Connect painted or anodized metal components using toothed self-locking screws or
remove the insulating layer.
● Use unpainted, de-oiled mounting plates.
● Establish a central connection between ground and the protective earth system (ground).
Shield gaps
● Bridge shield gaps (at terminals, circuit breakers, contactors, and so on) with minimum
impedance and the greatest possible surface area.
Use large cross-sections
● Use grounding wires or straps with large cross-sections or, better still, with finely stranded
wires or flexible straps.
Lay the motor supply cable separately
● The distance between the motor supply cable and signal cables should be > 20 cm. Do
not lay signal cables and motor cables parallel to each other.
Laying the equipotential bonding cable
● It is recommended to lay an equipotential bonding cable with a minimum cross-section of
16 mm
Use interference suppressors
● If relays, contactors, and inductive or capacitive loads are connected, the relays or
contactors must be fitted with interference suppressors.
Enclosed Drives
Operating Instructions, 12/2018, A5E36652151A
Definition of categories C1 to C4
Definition of categories C1 to C4
Rated voltage < 1000 V; unrestricted use in the first environment.
Rated voltage for stationary drive systems < 1000 V; for use in the second
environment. For use in the first environment only when sold and installed
by skilled personnel.
Rated voltage < 1000 V; for use in the second environment only.
Rated voltage ≥ 1000 V or for rated currents ≥ 400 A in complex systems in
the second environment.
in parallel to the control lines.
2
Electrical installation
4.5 EMC-compliant design
65
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