⚡ Electrical Engineering
Electrical Engineering Calculators
Voltage drop (1ph/3ph/DC), conductor sizing, motor current & protection, power factor correction, short-circuit current and AWG conversion.
⚡ Quick answer
INDUGRID provides 9 free Electrical Engineering engineering calculators for professional use. Voltage drop (1ph/3ph/DC), conductor sizing, motor current & protection, power factor correction, short-circuit current and AWG conversion.
Voltage Drop — Single Phase AC
Calculate voltage drop in single-phase AC cables from current or power, cable length and conductor c…
Uv = 2 × ρ × L × I × cos(φ) / A [ρ_Cu = 0.01754 Ω·mm²/m @ 20°C]
Voltage Drop — Three Phase AC
Calculate voltage drop in three-phase AC cables. Three-phase transport is significantly more efficie…
Uv = √3 × ρ × L × I × cos(φ) / A
Minimum Conductor Cross-Section
Calculate the minimum required conductor cross-section to stay within a maximum permissible voltage …
A_min (1-ph) = 2×ρ×L×I×cos(φ) / ΔU | A_min (3-ph) = √3×ρ×L×I×cos(φ) / ΔU
DC Voltage Drop (24V / 48V Systems)
Calculate voltage drop in DC control circuits, PLC power supplies, 24V solenoids and battery systems…
Uv_DC = 2 × ρ × L × I / A [no power factor — DC has cos φ = 1]
Three-Phase Motor Current & Protection
Calculate nominal current, start-up current and thermal protection settings for three-phase inductio…
IN = Pa / (η × √3 × U × cos φ) [A] | I_start = IN × (IA/IN)
Power Factor Correction (Capacitor Bank)
Calculate reactive power compensation and required capacitor bank size to improve power factor from …
Qc [kVAr] = P × (tan φ₁ − tan φ₂) | C [µF] = Qc × 10⁶ / (2π × f × U²)
Short-Circuit Current (Ik) Calculation
Estimate the prospective short-circuit current at a given point in the installation, considering tra…
Ik = U_n / (√3 × Z_total) where Z_total = √(R_total² + X_total²)
AWG ↔ mm² Wire Size Converter
Convert American Wire Gauge (AWG) to mm² and vice versa. Essential when working with US-manufactured…
d(AWG) = 0.127 × 92^((36−AWG)/39) [mm] | A = π/4 × d² [mm²]
Transformer Sizing
Calculate required transformer kVA rating based on connected loads, demand factor and efficiency.…
S_kVA = (sum P_loads x demand_factor) / (PF x eta_trafo)