How long is an EC Declaration of Conformity valid?

The EC Declaration of Conformity is valid for an indefinite time after the essential safety requirements of the product is determined and remains valid for products as long as no major changes are made, ie products that have been repaired without the original operation, the original intended use or the original type is changed. Products to which significant changes have been made with relation to the original operation, the original purpose or type or intended use of the product, eg by using other components or new suppliers, can be considered as a new products. When such changes occur, a re-evaluation certification process must take place, possibly on the basis of the previous certification, and a proposal for a new EC Declaration of Conformity, in accordance with new guidelines and / or standards should be developed. The EC Declaration of Conformity must be at least ten years after the last date of manufacture of the product be kept, unless the directive expressly indicates another term.