CE involves a statement issued by the manufacturer, stating that the product complies with the basic criteria of the European Union - for example the EMC Directive - with respect to safety, the environment, and the user's health. This statement is visibly represented on the product by the CE symbol.
Depending on the risks, for some product groups the manufacturer's statement must be confirmed by means of testing by an independent third party, a so-called Notified Body. If there is compliance with all the applicable criteria stipulated in the European standard for the relevant product, then there is a legal "assumption of conformity to the requirement originating from the directive." A test conducted by an independent third party on the basis of the prevailing European standards confirms that assumption of conformity. Apart from that, it may also be obligatory to comply with several directives and consequently different European standards - for example a combination of the EMC Directive and the Low Voltage Directive.