Featured answer
Voltage drop field guide
Get the right answer in the field. Formula, examples, acceptable limits, and when to document the result.
Direct answer
Voltage drop is the voltage lost in a conductor while current flows through it. Many designs use 3 percent for branch circuits and 5 percent total feeder plus branch circuit as a target, but project documents and equipment requirements control the decision.
3 ph
| System | 480 V / 3ph |
|---|---|
| One-way length | 150 ft |
| Load current | 68 A |
| Conductor | #2 Cu |
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