To convert the resulting cross-sectional area to square millimeters, multiply the result by 1,000,000.įor example, let’s calculate the wire size of a 100-meter-long copper wire for a single-phase circuit when it must supply 30 amps of current with a 10 V voltage drop allowed:Ī (mm²) = 2 × 1.7241×10 -8 Ω
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