19 AWG (American Wire Gauge) wire specifications: 0.9116 mm diameter, 0.6527 mm² area. Resistance, weight, and common uses.
| Diameter | 0.9116 mm · 0.035891" · 35.89 mils |
| Cross-sectional area | 0.6527 mm² · 1,288 circular mils |
| Resistance (copper, 20°C) | 26.4131 Ω/km · 8.0507 Ω/1000ft |
| Resistance (aluminum, 20°C) | 43.3003 Ω/km · 13.1979 Ω/1000ft |
| Ampacity — copper 60°C | — A |
| Ampacity — copper 75°C | — A |
| Ampacity — copper 90°C | — A |
| Ampacity — aluminum 75°C | — A |
| Weight (copper) | 5.848 kg/km · 3.93 lbs/1000ft |
| Weight (aluminum) | 1.762 kg/km · 1.184 lbs/1000ft |
| Closest IEC 60228 size | 0.75 mm² |
| 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 |
19 AWG wire (0.9116 mm diameter, 0.6527 mm²) is common in data and telecommunications cabling. It is the conductor size for some Cat 3 and Cat 5 Ethernet cables, alarm system wiring, and low-voltage control circuits. It is also used in small transformer windings and automotive sensor wiring.
No. 19 AWG wire is far too small for household branch circuits. NEC 210.3 requires 14 AWG copper minimum for 15 A circuits and 12 AWG for 20 A circuits. At only 0.9116 mm diameter (0.6527 mm²), 19 AWG would overheat and present a fire risk under household loads. It is suitable only for low-voltage applications such as data cabling, alarm wiring, and Class 2/3 control circuits under NEC Article 725.