| 35.1 | ELECTRIC POWER GENERATION, TRANSMISSION AND DISTRIBUTION |
| Class | The name of the class |
| 35.11 | Production of electricity |
| 35.12 | Transmission of electricity |
| 35.13 | Distribution of electricity |
| 35.14 | Trade of electricity |
| 35.2 | MANUFACTURE OF GAS; DISTRIBUTION OF GASEOUS FUELS THROUGH MAINS |
| Class | The name of the class |
| 35.21 | Manufacture of gas |
| 35.22 | Distribution of gaseous fuels through mains |
| 35.23 | Trade of gas through mains |
| 35.3 | STEAM AND AIR CONDITIONING SUPPLY |
| Class | The name of the class |
| 35.30 | Steam and air conditioning supply |