Wire

#2 Gauge Wire Calculator — ChiefEngineer.in

Properties of #2 AWG wire and voltage drop for a specified run.

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Formula

d = 0.127 × 92(36−2)/39
A = πd²/4
ΔV = 2ρLI/A

Variables

  • d — diameter
  • A — area
  • I — current
  • L — length
  • ρ — 0.0175 Ω·mm²/m (Cu)

Worked Example

Input: 100 A, 30 m

Result: d = 6.5437 mm, A = 33.63 mm², ΔV ≈ 3.12 V

Assumptions & Notes

Ampacity depends on insulation, installation, ambient temperature and code. Never assume a universal safe current without those conditions.

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