Feeder Sizing Calculator
Feeder conductor size from load amps and distance, with voltage drop check per NEC 215.2.
Inputs
%
Results
Conductor ampacity (A)
200
Actual voltage drop (V)3.99
Actual voltage drop (%)0.83
Min cmil for VD limit46,549
Parallel conductor runs1
Load current (A)200
Ampacity Keyampacity_cu
Ground Wire6 AWG
Sizing BasisAmpacity
How to Use This Calculator
- Enter the total feeder load in amperes from your panel schedule or load calculation.
- Enter the one-way distance in feet from the source panel to the load panel or equipment.
- Set the system voltage (208, 240, 277, or 480 V) and phase count (1 or 3).
- Select conductor material — copper (1) or aluminum (2) — and the maximum allowable voltage drop percentage (NEC recommends 3%).
- Read the selected conductor ampacity, actual voltage drop in volts and percent, and whether parallel runs are required.
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