Find the correct wire gauge for any electrical circuit based on amperage, voltage, and run length.
Circuit Details
120V for standard outlets and lighting. 240V for dryers, ranges, and HVAC equipment.
Wire Type and Installation
Copper is standard for most residential wiring. Aluminum is used for large feeder runs and service entrances.
Conduit protects wire and allows higher ampacity. Free air is for exposed or overhead runs.
NEC allows up to 5% voltage drop. 3% is recommended for sensitive equipment.