Ex Components

Not a full certification and apparatus to which this certificate appears will need additional protection before use in a hazardous area ‘Components’: means any item essential to the safe functioning of equipment and protective systems but with no autonomous function.‖

Certificate number will end in the letter ― ‘U’ components do not require the CE mark A Component Certificate needs always additional certification before bringing into service. You could recognise a component certificate through its name and through a ‘U’ behind its certificate number. ‘U’ is German ‘Unvollständig’ and means incomplete certification. Only the component is certified, but not - without further action- suitable for installation in hazardous areas. Not completed component certification has a way of protection- and a group marking. No temperature class is mentioned on this type of certificate.

Examples of component certified products are terminals, switchgear, remote I/O. Often additional enclosures are required, and however empty enclosures belong also to the examples of component certified products.

Ex Components, according to Clause 13, shall be legibly marked and the marking shall include the following:

• The name or the registered trade mark of the manufacturer;
• The manufacturer’s type identification;
• The symbol Ex;
• The symbol for each type (or level) of protection used;
• The symbol of the group of the electrical equipment of the Ex Component;
• The name or mark of the issuer of the certificate, and the number of the certificate;
• The symbol ― ‘U’; and

The Ex marking for explosive gas atmospheres and explosive dust atmospheres shall be separate and not combined.