The use of electrical and electrical equipment is becoming more widespread. However to ensure safe and reliable operation, electromagnetically compatible conditions must exist i.e. a device must be able to work satisfactorily in its electromagnetic environment and without itself causing unacceptable electromagnetic inference in the same environment.
Electromagnetic inference can cause various faults that are often difficult to diagnose. Crackling and hissing on a radio receiver, data errors and processor glitches in computer engineering and even the breakdown of isolation are all possible effects. To ensure compliance with relevant EMC directives and to avoid instances of interference, appropriate EMC filters must be used.
Electromagnetic interference can be propagated in various ways. The nature of that propagation depends on the frequency involved. EMC filters are used to suppress conducted inference by maximizing the impedance mismatch between line and load. The filtering effect works in both directions. This means that interference from the power-consuming device to the network as well as from the network to the power-consuming device is damped.
Limits on radio interference voltage
A number of EN (European norms) specify limits on radio interference voltages. These EN regulations differentiate between use in residential or light
industrial areas (Class A) and in industry (Class B). To make it easier to select the correct filter and where possible, the classification is shown in our catalogue.