Hello and Happy new year :slight_smile:

Thank you for your feedback, ISIC classification is a really good framework.

As I answered in the industrial Talk, we’re not dealing about construction. Section F class 4220 only covers contractors, who install all the wires, pipes not the companies who operate and maintain them. The difference is between build and run.
I gave some matching between utility=* and ISIC classes.

By the way, oil refineries got their own class 1920 in section C, manufacturing and any other utility got its own too in different sections.
Doubt remains about oil processing be the only activity that isn’t an utility for others.
Which difference does it make with class 3520 section D (manufacture of gas)?