Load, Demand & Supply
Electrical Load Current Calculator
Convert electrical input power to line current, per-phase real power and apparent power for a single-phase or balanced three-phase supply.
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Tools for turning connected loads into usable design checks: current, diversified demand, phase allocation, supply headroom, transformer capacity and generator requirements. Enter project-specific values and verify the result against the installation design, equipment data and applicable requirements.
Load, Demand & Supply
Final Subcircuit Maximum Demand Calculator
Estimate one final subcircuit demand from point counts, fixed-load contribution and explicit project factors.
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Generator kVA Requirement Calculator
Estimate a generator's apparent-power requirement by comparing steady demand with a largest-motor start condition and explicit project reserve.
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Lighting Load and Circuit Estimate
Estimate single-phase-equivalent lighting load, apparent load, current, and an arithmetic circuit count from user-entered luminaire input data.
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Main Switch and Supply Capacity Checker
Compare a calculated demand current with main-switch, supply and reserve-current limits.
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AS/NZS 3000 Maximum Demand Worksheet
Apply user-entered category demand factors to a structured load schedule and estimate diversified demand without embedding an unverified Wiring Rules table.
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Connected Load Demand Estimator
Estimate diversified real power, apparent power and line current from a connected load and an explicitly supplied demand factor. It does not apply Australian...
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Ohm’s Law Calculator
Solve voltage, current or resistance from the other two entered circuit values and show the corresponding V×I real-power product for a DC or unity-power-factor...
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Power Factor Correction Calculator
Estimate signed reactive-power correction needed to move an ideal sinusoidal load from its entered power factor to a chosen target.
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Switchboard Phase Allocation Calculator
Add prospective single-phase loads to a balanced three-phase base load and show phase spread before circuit allocation.
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Three-Phase Load Balance Calculator
Compare three measured or scheduled phase currents and show total, average, extremes, spread and peak deviation. It does not judge installation compliance.
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Transformer Terminal Fault Current Estimate
Estimate transformer full-load current and transformer-only symmetrical RMS terminal fault current from nameplate rating, secondary voltage and percent impedance.
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