Voltage Drop Calculator
Calculate the voltage drop in your electrical circuit to ensure proper wire sizing and safe operation.
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Voltage Drop Guides & Articles
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How Voltage Drop Works
- What is Voltage Drop: The decrease in voltage as current flows through wire resistance
- NEC Recommendation: Maximum 3% drop for branch circuits, 5% total for feeder + branch
- Copper vs Aluminum: Copper has lower resistance but costs more than aluminum
- Wire Size: Larger gauge numbers mean smaller wire with more resistance
- Distance Matters: Longer runs require larger wire sizes to maintain acceptable voltage
Frequently Asked Questions
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