How were classes 25.21 and 25.30 merged?

Classes 25.21 and 25.30 merged in NACE Rev. 2.1 into a new class 25.21, manufacture of central heating radiators, steam generators and boilers. Paragraph 145 of the manual states the merger. The same paragraph sequence also records the restructuring of group 25.6, treatment and coating of metals and machining, in paragraph 146, without further detail in section 4. The merger is not a split, and it does not determine a code for a specific reader.

What were the old classes?

Paragraph 145 names the old classes in full. Class 25.21 was manufacture of central heating radiators and boilers. Class 25.30 was manufacture of steam generators, except central heating hot water boilers. The old structure divided the heating and steam generating equipment by the exception in the second title: central heating hot water boilers sat in the first class, and other steam generators sat in the second. The division turned on the exception, and a reader had to read both titles together to see the boundary. The new structure removes the exception by joining the two classes under one title that names all three products together.

The new title, manufacture of central heating radiators, steam generators and boilers, is a combined title, not a new product. It names the radiators from the old first class, the steam generators from the old second class, and the boilers from both, in a single heading. The combination simplifies the reading of the group, because the boundary between the two old classes no longer has to be drawn. The explanatory note for the new class states the inclusions and exclusions in full, and the note is the authority for the content of the merged class, not the two old titles added together without the note.

What happened to group 25.6?

Paragraph 146 states, in a single sentence, the restructuring of group 25.6, treatment and coating of metals, machining. Section 4 gives no further detail about the restructuring in that paragraph, and this guide does not invent detail for it. The restructuring is recorded here as a structural fact, to warn a reader that the group changed in the revision, and that the notes for the group and its classes must be read in the current version rather than assumed from the old version. The detailed structure in Part 2 lists the classes in the restructured group, and the explanatory notes state the content of each class.

The pairing of the merger and the restructuring in adjacent paragraphs is a reminder of the scale of the revision inside division 25. The division covers manufacture of fabricated metal products, except machinery and equipment, and it contains several groups whose internal boundaries were redrawn. A reader working in the division should therefore check the notes for the group and class concerned, and the correspondence table for the old class, before comparing figures across versions. A group level or class level comparison that assumes continuity in division 25 will miss the merger in paragraph 145 and the restructuring in paragraph 146.

How is the merger shown?

| Old class in NACE Rev. 2 | New class in NACE Rev. 2.1 |

|---|---|

| 25.21, manufacture of central heating radiators and boilers | 25.21, manufacture of central heating radiators, steam generators and boilers |

| 25.30, manufacture of steam generators, except central heating hot water boilers | 25.21, manufacture of central heating radiators, steam generators and boilers |

The table follows paragraph 145. Two source rows point to one target row, which is the many to one pattern in paragraph 207. The table states the merger at class level, and it does not state the group 25.6 restructuring, because paragraph 146 states no class level detail for that restructuring in section 4. The correspondence table records the full class level pattern, and the notes record the content of the merged class.

What does a split not decide?

A split in the classification is a change in the structure of the published categories. It is not a decision about a specific unit. The correspondence table records the scopes where one old class becomes two or more new classes, and the explanatory note for each new class states its inclusions and exclusions. Neither document picks a new class for a specific unit. The classification is statistical only. No decision on tax, a licence, social security, a collective agreement or funding eligibility follows from the code, and confirmation of a unit’s entry rests with the institute or register holding its record.

Where is a split class confirmed?

The check for a split class runs in three steps. First, the section 4 summary in the manual for the change as adopted. Second, the explanatory notes for the new classes, for inclusions and exclusions. Third comes the institute or register holding the entry actually held. This guide gives the first step and points to the other two.

Read the merged class as one heading for radiators, steam generators and boilers, check the notes for group 25.6, and confirm the entry with the institute or register that holds it.