Determine the correct wire gauge for a 100-amp service based on distance and material.
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Recommended Sizes
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Overview
This calculator helps you select the appropriate wire size for a 100-amp circuit. It accounts for both NEC ampacity standards and voltage drop over distance.
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Pro Tips
For a typical 100A residential service, #3 AWG Copper or #1 AWG Aluminum is common.
If the run is over 100 feet, you may need to increase wire size to keep voltage drop below 3%.
Always consult a licensed electrician and local building codes.
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Fun Facts
"Copper is about 60% more conductive than aluminum, which is why aluminum wires must be thicker for the same current."
"The 'AWG' system was developed in 1857 and is still used today in North America."
"Thicker wires have less resistance, which means less energy is lost as heat."
