Within the framework of the harmonisation of national regulations, EMC guidelines were drawn up and, on November 9, 1992, incorporated in the Electromagnetic Compatibility Act. 

One result of this is the need to test not only radio-operated equipment but also all electrical and electronic devices, equipment and systems in respect of electromagnetic compatibility. The aim of these checks is to issue the CE mark, which is required for the operation of all electrical devices and equipment since January 1, 1996.
 

If EMC compliance cannot be achieved by a circuit design which conforms to electromagnetic compatibility and/or by means of a metal internal encapsulation, the appropriate measures can be taken on the enclosure side.

From these figures, it can be deduced that when it comes to selecting an enclosure, in 90% of all cases, electronics which conform to EMC can be incorporated in every required enclosure without any additional work or expense.

This means that there is no need to do without the main advantages of plastic enclosures because screening is being used. These advantages include:

• attractive design
• considerable price advantage
• much lighter, more variable