As with the residential part of the series, the dual numbering of the industrial generic immunity standard records that CENELEC published the international text without technical change, adding only a foreword that confirms the adoption and an annex that links the document to the directive. The European and the international designations therefore describe an identical test programme, and the choice between them affects the citation in the technical file rather than the measurements taken. What distinguishes the industrial generic standard from its residential counterpart is the severity of the levels and the wider range of phenomena considered, which reflect an installation where welding plant, large drives and switchgear operate close to the product. The generic route is available only where no dedicated product or product family standard applies, so a manufacturer of machinery will usually find the applicable standard elsewhere and use this one only for equipment that falls outside those families.