Standards & References

OhmNexus calculators are grounded in widely recognized electrical engineering standards and conventions. This page summarizes the main references our tools draw on and how to apply their results responsibly.

Standards and conventions we reference

• NEC (NFPA 70), National Electrical Code. The benchmark for electrical installation, conductor ampacity, and wire sizing in the United States, published by the National Fire Protection Association.
• IEC 60364. The International Electrotechnical Commission standard series for low-voltage electrical installations, widely used outside North America.
• IEC 60038, standard voltages. The international reference for nominal supply voltages (230/400 V, 50 Hz), offered as the alternate to the US defaults our AC-mains tools start from.
• IEEE standards. Power, conductor, and measurement practices published by the Institute of Electrical and Electronics Engineers.
• SI units and Ohm's law. Every tool works in SI units (volt, ampere, ohm, watt, joule) and applies the fundamental relationships of Ohm's law and electrical power.

How we apply them

Our AC-mains conversion tools default to US nominal voltages (120/240 V) and 60 Hz, with international values such as 230/400 V at 50 Hz available as alternates; battery and DC nominal voltages (12/24/48 V) are universal. Where a result depends on a convention, such as single-phase versus three-phase, power factor, system voltage, or temperature, the calculator exposes that choice as an input and states the assumption. The formula and a worked example appear on every tool, so you can trace exactly how a result is produced.

You can see these conventions at work across the site. Our power conversion calculators apply the standard power relationships to convert between amps, watts, volts, kVA, and kW for DC, single-phase, and three-phase systems; our battery calculators work in amp-hours and watt-hours for sizing and runtime; and our horsepower conversions use the electrical definition of 1 hp = 746 W. In every case the result reduces to Ohm's law and the electrical power equations, shown with the formula and a worked example on each tool. Browse the full library in the calculators directory.

Use results responsibly

Our calculators are educational and planning aids. Real-world electrical work is governed by local codes, site conditions, and manufacturer specifications that a general-purpose tool cannot capture. Always verify critical results against the applicable code, and for any installation or safety-critical decision, consult a licensed electrician or professional engineer.