Electrical Conduit and Fittings are made in accordance with AS/NZS 2053.1 for electrical installations. All PVC Electrical Conduit for electrical applications are required to be coloured orange for underground applications.
It is important that a qualified installer is used and are familiar with the requirements of the standard as well as the requirements of the electrical regulators.
Quite often a marker tape is required for Electrical Conduit installation; often it states “Danger Electrical Cables” in black letters on an orange background.
Often additional mechanical protection may be required for Medium Duty Electrical Conduits in the form of Pre-cast concrete slabs or electric bricks, concrete (as specified by the regulator) and often polymetric cable cover strip in accordance with AS 2053.2 and installed as per AS 3000.
In many large-scale developments drawings will be provided detailing the numbers, size, location and types of Electrical Conduit required together with cable jointing pits when necessary.
Different electricity regulators in various states require different types of conduits be it profile wall, smooth bore or plain rigid conduits. The type of Electrical Conduit required may vary depending on the usage such as ton house developments or under roadways or rail, or on private property or suburban developments.
It is important that in electrical conduit installation, the installer must use the appropriate type of Electrical Conduit for the specific job. The type of Electrical Conduit is normally specified by the electricity company responsible for the region/area.
Communications Conduit also varies between rigid UPVC, profile wall, smooth bore or Corflo for Telstra or other communications networks.
The table below sets out a guide from one Electricity Provider. It is important to note this is a guide only.
| GUIDE TO THE MAXIMUM NUMBER OF HV CABLES INSTALLED IN CONDUIT | ||||||||
| Cable | Conduit size (internal diameter) | |||||||
| Type & number of Cores |
Conductor cross sectional area |
Cable Diameter (mm) |
Minimum Bending Radius (mm) |
50mm | 63mm | 100mm | 125mm | 150mm |
| HV One Core | 35mm² | 25 | 510 | 0 | 1 | 2 | 3 | 3 |
| 240mm² | 37 | 640 | 0 | 0 | 1 | 2 | 3 | |
| HV Three Core | 240mm² | 76 | 1320 | 0 | 0 | 0 | 1 | 1 |
| 300mm² | 78 | 1430 | 0 | 0 | 0 | 1 | 1 | |
| 400mm² | 90 | 1560 | 0 | 0 | 0 | 0 | 1 | |
| GUIDE TO THE MAXIMUM NUMBER OF LV CABLES INSTALLED IN CONDUIT | ||||||||
| Cable | Conduit size (internal diameter) | |||||||
| Type & number of Cores |
Conductor cross sectional area |
Cable Diameter (mm) |
Minimum Bending Radius (mm) |
50mm | 63mm | 100mm | 125mm | 150mm |
| LV One Core | 70mm² | 16 | 150 | 1 | 2 | 3 | 4 | 4 |
| 150mm² | 23 | 210 | 0 | 0 | 2 | 2 | 4 | |
| 300mm² | 31 | 280 | 0 | 0 | 0 | 1 | 2 | |
| 500mm² | 39 | 360 | 0 | 0 | 0 | 1 | 2 | |
| LV Two Core | 16mm² | 18 | 330 | 1 | 2 | 3 | 4 | 5 |
| LV Four Core | 16mm² | 22 | 400 | 1 | 1 | 2 | 4 | 5 |
| 120mm² | 35 | 630 | 0 | 0 | 1 | 1 | 1 | |
| 240mm² | 55 | 990 | 0 | 0 | 1 | 1 | 1 | |
For any questions or for more information, please contact us.
