Data

American wire gauge

Wikipedia

Resistance of solid copper at 20 °C by gauge (for example 12 AWG: 5.211 ohm/km). Secondary source; stranded and warm cable runs slightly higher.

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Consulted: October 10, 2026
Language: en

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Guides

Low-voltage (12 V) landscape lighting

Glossary terms

What we take from it

Copper resistance per length depends on gauge: for example about 13.2 ohm/km at 16 AWG, 5.2 at 12 AWG and 3.3 at 10 AWG.