3-Phase Neutral Current Calculator – Unbalanced Load (No Harmonics)

Calculate AC/DC current in amps from voltage, power (watts/kW), power factor, or resistance. Supports single-phase, three-phase, and Ohm’s Law. Supports: Single-phase and three-phase systems Active power → current Apparent power → current Resistance/impedance → current Bilingual support Key Formulas Single-phase: I = P / (V × cosφ) Three-phase: I = P / (√3 × V × cosφ) Single-phase: I = S / V Three-phase: I = S / (√3 × V) Single-phase: I = V / R Three-phase: I = V / (√3 × Z) Example Three-phase system, 400V, 10kW, PF=0.85 → Current ≈ 17.5 A Typical Equipment Current Reference Equipment Power Voltage Power Factor Estimated Current Household Refrigerator 150 W 230 V 0.95 ≈ 0.69 A LED Lighting (Total Load) 200 W 230 V 0.98 ≈ 0.89 A Electric Kettle 2.2 kW 230 V 1.0 ≈ 9.6 A Air Conditioner (1.5 HP) 1.1 kW 230 V 0.85 ≈ 5.6 A Three-Phase Water Pump 7.5 kW 400 V 0.88 ≈ 12.3 A Industrial Motor (15 kW) 15 kW 400 V 0.9 ≈ 24.1 A Solar Inverter (DC Output) 5 kW 48 V — ≈ 104 A Frequently Asked Questions (FAQ) Can this calculator handle both AC and DC circuits? Yes! It supports DC (using I = P/V or I = V/R) and AC single-phase/three-phase systems (with power factor and impedance). What if I don’t know the power factor? For resistive loads (heaters, incandescent lamps), use PF = 1.0. For motors, a typical value is 0.8–0.9. You can adjust it to see how current changes. Is this suitable for motor full-load current (FLC) estimation? This tool calculates theoretical current using formulas. For NEC-compliant FLC values, refer to standard tables—but this is excellent for preliminary sizing and understanding. Why does three-phase current use √3 in the formula? In balanced three-phase systems, line voltage is √3 times the phase voltage, which reduces the current per conductor for the same power—improving efficiency. Applications Home Electrical Projects: Size breakers, wiring, and outlets based on appliance current draw. Solar & Battery Systems: Calculate DC current for inverters, charge controllers, and battery banks. Industrial Maintenance: Estimate motor or pump operating current before installation. Education & Training: Visualize how voltage, power, and power factor affect current in real time. Energy Audits: Convert equipment nameplate data (kW, V, PF) into actual current for load analysis. Who Should Use This Tool? Electrical engineers and designers Electricians and maintenance technicians Students of physics or electrical engineering DIY homeowners installing EV chargers, solar panels, or workshops Renewable energy professionals

Maximum short-circuit current

Calculates the minimum short-circuit current at the end of a low-voltage circuit, used to verify protective device sensitivity. Supports: Single-phase, two-phase, three-phase systems Copper/Aluminum conductors mm²/AWG units m/ft/yd length units Parallel conductors Key Formula I_sc,min = U / (√3 × (R_L + X_L)) Where: U: System voltage R_L: Line resistance X_L: Line reactance Example Current type: Three-phase Voltage: 400 V Length: 50 m Conductor: Copper, 16 mm² → Minimum short-circuit current ≈ 8.5 kA

Calculate the operating current of electrical equipment based on active power, voltage, efficiency, and power factor. Supports: Single-phase and three-phase systems Standard voltages (400V/230V, 690V/400V, etc.) Custom voltage input Adjustable efficiency and power factor Coincidence factor Key Formula I = P / (√3 × V × η × cosφ) Where: P: Active power (kW) V: Line voltage (V) η: Efficiency cosφ: Power factor Example Three-phase system, 400V, 10kW, η=0.9, PF=0.85 → Operating current ≈ 19.5 A