The cross-section of a conductor determines how much current it can safely carry. The breaker must always match it: it may never allow the cable to carry more than it can handle (AREI Book 1, Part 5 — Selection and use of equipment). An oversized breaker on an undersized wire is a classic fire risk.
Size, breaker and application
| Size (copper) | Max. breaker | Typical use |
|---|---|---|
| 1.5 mm² | 16 A | lighting, socket circuit (max. 8 points) |
| 2.5 mm² | 20 A | sockets, dishwasher, washing machine, oven |
| 4 mm² | 25 A | heavier circuits |
| 6 mm² | 32 A | hob / cooker |
| 10 mm² | 40 A | main feed / heavy loads |
These are indicative values for a typical installation method. The final choice also depends on the installation method, cable length (voltage drop) and ambient temperature.
Appliances with a dedicated circuit
The hob, oven, dishwasher, washing machine and dryer each get a separate circuit.
Put the dryer and washing machine on separate circuits.
Keep lighting and sockets on different circuits.
How Voltuno helps
The size and breaker for each circuit are best recorded on your single-line diagram. With Voltuno, you draw a correct single-line diagram, position diagram and matching bill of materials in minutes. Our software is built around AREI requirements, so you can work faster and prepare inspections with a clear, complete file.
Please note: this article is a general explanation and not legal advice. Always consult the official, consolidated AREI text (FPS Economy) for the exact obligations and article references.
