Wire Gauge Calculator
Determine appropriate wire gauge based on current, length, and acceptable voltage drop.
Wire Gauge Calculation
Understanding Wire Gauge
Wire gauge refers to the diameter of an electrical wire. A larger gauge number indicates a smaller wire diameter, and vice-versa. Proper wire sizing is crucial for safety and efficiency in electrical installations, preventing overheating and excessive voltage drop.
Factors Affecting Wire Sizing
- Current (Amps): Higher current requires thicker wire.
- Length: Longer runs increase resistance and voltage drop, requiring thicker wire.
- Voltage Drop: The acceptable percentage of voltage loss over the wire length.
- Wire Material: Copper has lower resistance than aluminum for the same gauge.
- Conductor Type: Single-phase vs. three-phase systems have different calculation factors.
AWG (American Wire Gauge) Chart
| AWG | Diameter (inches) | Diameter (mm) | Resistance (Ω/1000ft, Copper) | Max Amps (Approx.) |
|---|---|---|---|---|
| 10 | 0.1019 | 2.588 | 0.998 | 30 |
| 12 | 0.0808 | 2.053 | 1.588 | 25 |
| 14 | 0.0641 | 1.628 | 2.525 | 20 |
| 16 | 0.0508 | 1.291 | 4.016 | 15 |
| 18 | 0.0403 | 1.024 | 6.385 | 10 |
| 20 | 0.0320 | 0.812 | 10.15 | 5 |
Frequently Asked Questions
What is voltage drop?
Voltage drop is the reduction in electrical potential along the length of a wire due to the resistance of the wire. Excessive voltage drop can lead to poor performance of electrical devices.
What is the difference between AWG and SWG?
AWG (American Wire Gauge) is primarily used in North America, while SWG (Standard Wire Gauge) is used in the UK and some other countries. They use different systems for numbering and have different wire diameters for the same gauge number.