Some machinery provided for use at work is refurbished or modified, sometimes without change of ownership, but also often prior to re-supply as second-hand equipment. The extent of the changes made to the original machinery, together with its provenance, can result in new legal obligations on the owner, user or person undertaking such work. In some cases where machinery has been so transformed or substantially rebuilt it may have to be considered as new machinery and so subject to the conformity assessment and CE marking requirements of the Machinery Directive even if originally compliant and CE marked when first placed on the market. However, refurbishment, even if very substantial, where parts are replaced with new similar versions (like for like etc) do not require re-CE-marking.
To read what the HSE has to say about this follow this link:
Tags: Substantial change