| 238210 | Telephone equipment and building wiring installation |
| | Telephone installation contractors |
| | Telecommunications equipment and wiring (except transmission line) installation contractors |
| | Surveillance system, installation only |
| | Public address system installation |
| | Low voltage electrical work |
| | Intercommunication (intercom) system installation |
| | Computer and network cable installation |
| | Communication equipment installation |
| | Audio visual equipment installation |
| | Audio equipment installation (except automotive) contractors |
| | Low voltage electrical work |
| 541512 | Audio visual and IT (information technology) systems integration design services |
| | Local area network (LAN) computer systems integration design services |
| | Network systems integration design services, computer |
| | Systems integration design services, computer |