Engineering Calculators

Voltage Drop Calculator

Source: Philippine Electrical Code (PEC) Part 1, 2017 Edition — Table 10.1.1.9 (p. 942)

Formula Reference

DC

Vd=2⋅L⋅I⋅RNV_d = 2 \cdot L \cdot I \cdot \frac{R}{N}

Single-Phase AC

Vd=2⋅L⋅I⋅(RNcos⁡θ+XNsin⁡θ)V_d = 2 \cdot L \cdot I \cdot \left(\frac{R}{N}\cos\theta + \frac{X}{N}\sin\theta\right)

Three-Phase AC

Vd=3⋅L⋅I⋅(RNcos⁡θ+XNsin⁡θ)V_d = \sqrt{3} \cdot L \cdot I \cdot \left(\frac{R}{N}\cos\theta + \frac{X}{N}\sin\theta\right)

V_d = voltage drop (V), L = one-way length (m), I = current (A), R/X = resistance / reactance per meter (Ω/m), N = parallel sets per phase, cos θ = power factor.

R and X, when resolved from PEC reference tables rather than entered manually, are sourced from Philippine Electrical Code (PEC) Part 1 (2017 Edition), published by Institute of Integrated Electrical Engineers of the Philippines, Inc.: Table 10.1.1.8 (Conductor Properties, p. 941) for DC, and Table 10.1.1.9 (Alternating-Current Resistance and Reactance for 600-Volt Cables, 3-Phase, 60 Hz, 75°C — Three Single Conductors in Conduit, p. 942) for AC.

Table 10.1.1.8 — Conductor Properties (p. 941)

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Table 10.1.1.9 — Alternating-Current Resistance and Reactance for 600-Volt Cables, 3-Phase, 60 Hz, 75°C — Three Single Conductors in Conduit (p. 942)

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