| 29020 | Electrical engineering in general |
| 29030 | Magnetic materials |
| 29035 | Insulating materials |
| 29040 | Insulating fluids |
| 29045 | Semiconducting materials |
| 29050 | Super conductivity and conducting materials |
| 29060 | Electrical wires and cables |
| 29080 | Insulation |
| 29100 | Components for electrical equipment |
| 29120 | Electrical accessories |
| 29130 | Switchgear and controlgear |
| 29140 | Lamps and related equipment |
| 29160 | Rotating machinery |
| 29180 | Transformers. Reactors |
| 29200 | Rectifiers. Converters. Stabilized power supply |
| 29220 | Galvanic cells and batteries |
| 29240 | Power transmission and distribution networks |
| 29260 | Electrical equipment for working in special conditions |
| 29280 | Electric traction equipment |
