Cable Cross Section Calculator Guide
Understanding Cable Sizing
Choosing the right wire size (gauge) is critical for safety. If a wire is too thin for the current (Amps) flowing through it, it will overheat, melt the insulation, and potentially cause a fire.
Voltage Drop
All wires have resistance. Over long distances, voltage is lost as heat.
Rule of Thumb: Limit voltage drop to 3% for critical loads and 5% for general loads.
Solution: Use a thicker wire (lower gauge number) for long runs.
Common Wire Gauges (AWG)
Household Circuits
- 14 AWG: 15 Amps (Lighting circuits)
- 12 AWG: 20 Amps (Outlets, Kitchens)
- 10 AWG: 30 Amps (Dryers, Water Heaters)
Heavy Duty
- 8 AWG: 40-50 Amps (Ranges, EV Chargers)
- 6 AWG: 50-60 Amps (Subpanels, Hot Tubs)
- Note: Lower number = Thicker wire!