Copper cable

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Cable Diameter Standards

Area (metric) Diameter American Wire Gauge Ampacity Typical Use
0.08 mm² 0.32 mm AWG28 0.8 A Wires inside a data cable
0.10 mm² 0.36 mm AWG27 1 A Thin hobby wire (home electronics for up to 30cm)
0.14 mm² 0.40 mm AWG26 1.3 A Cat5 UTP, Flexible hobby wire
0.25 mm² 0.50 mm AWG23 / AWG24 3 A Cat6 FTP, breadboard wires, Thicker hobby wire
0.50 mm² 0.75 mm AWG20 / AWG21 5 A Low voltage power cable (e.g. for phone or doorbell or powering electronics)
0.75 mm² AWG18 / AWG19 10 A Power cable between outlet and device
1.5 mm² AWG16 12 A Thin power wire in walls (black wire for switches)
2.5 mm² AWG14 15 A Normal power wire in walls (power, zero and earth wire)
6.0 mm² AWG10 30 A Thick wire in electric panel (groepenkast)

The metric area is the advertised area, equivalent of mm² copper. The actual diameter, when translated from AWG specification may differ.

The Ampacity is the maximum current that can be transported through the wire without exceeding its temperature rating. In this case, the Ampacity at 60°C is given. For higher temperatures, multiply by 1.5. Given the power and voltage of a device, this allows you to determine the required amperage, and thus the required cable diameter.

Other considerations

solid or flexible.
copper of CCA (copper cladded aluminium). Copper is considered slightly better. CCA is cheaper and is consider good enough.

Network Cabling

Further Reading

For UTP cabling