24 AWG (American Wire Gauge) wire specifications: 0.5106 mm diameter, 0.2047 mm² area. Resistance, weight, and common uses.
| Diameter | 0.5106 mm · 0.020101" · 20.1 mils |
| Cross-sectional area | 0.2047 mm² · 404 circular mils |
| Resistance (copper, 20°C) | 84.2083 Ω/km · 25.6667 Ω/1000ft |
| Resistance (aluminum, 20°C) | 138.05 Ω/km · 42.0766 Ω/1000ft |
| Ampacity — copper 60°C | — A |
| Ampacity — copper 75°C | — A |
| Ampacity — copper 90°C | — A |
| Ampacity — aluminum 75°C | — A |
| Weight (copper) | 1.834 kg/km · 1.233 lbs/1000ft |
| Weight (aluminum) | 0.553 kg/km · 0.371 lbs/1000ft |
| Closest IEC 60228 size | 0.2047 mm² actual — smaller than 0.5 mm², the smallest IEC 60228 size |
| Skin depth at 60 Hz | 8.531 mm |
| Type | Temperature | Description |
|---|---|---|
| PVC | 60-105°C | General purpose insulation |
| Teflon (PTFE) | 200°C | High temperature applications |
| Silicone | 200°C | Flexible, high temperature |
| Enamel | 155-220°C | Magnet wire coating |
24 AWG copper is used for telephone wire, data cable and sensors. It is a low-voltage size and is not permitted for 120V building branch circuits. Diameter is 0.511 mm and cross-section 0.205 mm².
24 AWG is not listed in NEC Table 310.16, so it has no code ampacity for building wiring. Commonly cited guidance is about 3.5A for a single conductor in free air (chassis wiring) and about 0.58A when bundled for power transmission. In long low-voltage runs, voltage drop usually limits it first.