Studies
Engineering studies, not just calculators
A calculator answers one question. An engineering study answers the set of questions that describe one system — a feeder, a transformer bus, a measurement loop — from a single set of inputs, run in dependency order, with the full worked solution behind every number.
Power Systems Fundamentals
Low-Voltage Feeder Study
Feeder sizing end to end from one set of inputs — transformer full-load current, three-phase load current, voltage drop over the run, conductor ampacity after derating, and the reactive power for a target power factor — each showing its full worked solution.
5 linked calculations · 8 inputs entered once
Transformer Sizing & Full-Load Current Calculator · Three-Phase Power Calculator · Voltage Drop Calculator · Cable Ampacity & Sizing Assistant · Power Factor Correction Capacitor Sizing
Open the studyTransformers
Transformer Fault & Motor-Starting Study
Available fault current at a transformer secondary, from nameplate %Z and the utility's contribution — with symmetrical and asymmetrical duty from the combined X/R ratio, and the voltage dip a motor start causes on that same bus.
4 linked calculations · 8 inputs entered once
Transformer Sizing & Full-Load Current Calculator · Symmetrical Fault Current Calculator · Transformer Impedance & Short-Circuit Current Calculator · Motor Starting Current & Voltage Dip Estimator
Open the studyElectronics & General Electrical
4–20 mA Measurement Chain Study
One process value followed from transmitter to ADC code — loop current, sense-resistor voltage, converter LSB and dynamic range, and the quantization error at the code the reading lands on.
4 linked calculations · 5 inputs entered once
4–20 mA Loop Scaling Calculator · Ohm's Law Calculator & Power Wheel · ADC Resolution & LSB Calculator · ADC Quantization Error & SNR Calculator
Open the studyEvery step of every study is a free calculator you can open on its own — browse the calculator library
What a study changes, and what it deliberately does not
Nothing about the mathematics changes. Each step is the same calculator the library already ships, showing the same equations, substitutions, assumptions and cited references it shows on its own page. A study composes those calculators; it does not reimplement them.
What changes is the bookkeeping, which is where multi-step analysis usually goes wrong. A shared value — the system voltage, the connected load, the power factor, the transmitter range — is defined once and carried into every step that needs it. A value one step computes is handed to the next rather than retyped, and every number on the page shows where it came from. Change one input and the study re-runs only the steps that input reaches.
A study reports what each calculation produced, with the calculators' own assumptions, model boundaries and references intact. It reaches no conclusion about your installation: comparing a derated ampacity against a load current, or a voltage drop against a design limit, is engineering judgement. Results are preliminary and educational until a licensed Professional Engineer has reviewed them.