| Property |
Value |
| Gauge 4 Diameter (in) |
0.2043 in |
| Gauge 4 Diameter (mm) |
5.189 mm |
| Gauge 4 Turns of Wire (per inch) |
4.89 turns/in |
| Gauge 4 Turns of Wire (per cm) |
1.93 turns/cm |
| Gauge 4 Cross-Sectional Area (kcmil) |
41.7 kcmil |
| Gauge 4 Cross-Sectional Area (mm²) |
21.2 mm² |
| Copper Resistance (Ω/km or mΩ/m) |
0.8152 mΩ/m |
| Copper Resistance (Ω/kft or mΩ/ft) |
0.2485 mΩ/ft |
| NEC Copper Wire Ampacity (60°C) |
70 A |
| NEC Copper Wire Ampacity (75°C) |
85 A |
| NEC Copper Wire Ampacity (90°C) |
95 A |
| Fusing Current (10 s) |
946.0 A |
| Fusing Current (1 s) |
6400.0 A |
| Fusing Current (32 ms) |
36000.0 A |
Frequently Asked Questions (FAQs) About 4 AWG Wire
What does AWG stand for?
AWG stands for American Wire Gauge, a standardized system for measuring wire sizes. The smaller the AWG number, the larger the wire diameter.
How does 4 AWG compare to 3 AWG?
4 AWG wire is smaller than 3 AWG, with a diameter of 5.189 mm compared to 5.827 mm for 3 AWG. It has a lower ampacity (e.g., 95 A at 90°C vs. 110 A for 3 AWG) and higher resistance.
What applications are suitable for 4 AWG wire?
4 AWG wire is often used for medium-current applications, such as branch circuits, feeders, or large appliances, with an ampacity of up to 95 A at 90°C.
What happens if the fusing current is exceeded?
If the fusing current is exceeded (e.g., 946 A for 10 seconds in 4 AWG), the wire will overheat and melt, potentially causing a fire hazard or circuit failure.
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