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Generator Feeder Wire & Voltage Drop

Conductor size from NEC ampacity, then voltage drop over the real run length, in copper or aluminum.

Inputs

Inputs and assumptions

Three percent is the usual design target for a feeder.

Result

Conductor circular mils
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Minimum ampacity at 125%
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Load current
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Voltage drop
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Voltage lost
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What to check

  • Conductor insulation rating and terminal temperature ratings
  • Actual one-way length including terminations and bends

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