1.
NACE Rev. 2 shall include: a first level consisting of headings identified by an alphabetical code (sections); a second level consisting of headings identified by a two-digit numerical code (divisions); a third level consisting of headings identified by a three-digit numerical code (groups); and a fourth level consisting of headings identified by a four-digit numerical code (classes).
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Source: EUR-Lex (Cellar) · retrieved 2026-11-03 · Text as adopted (Official Journal); later amendments are not incorporated in this text.