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Engineerly

Engineering disclaimer

Last updated 2026-11-10

Engineerly provides estimates for education and preliminary design. It is not a substitute for a licensed professional engineer, the applicable codes and standards (including IEC 60364, NFPA 70 / NEC, BS 7671 and local regulations), or the data of the equipment manufacturer.

What the calculators are

The calculators apply standard, simplified engineering formulas to the values you enter. They show their working and assumptions so you can judge whether those assumptions fit your case. They are suitable for learning, checking orders of magnitude, comparing options and preparing questions for a designer or supplier.

What they are not

  • They are not a design, a specification or a certification of compliance with any code.
  • They do not consider every factor that matters in a real installation, such as installation method, grouping, ambient temperature, fault levels, protection coordination, harmonics, unbalance, transient behaviour and equipment-specific ratings.
  • They do not replace manufacturer software or datasheets, for example generator motor-starting curves, battery discharge tables, cable resistance tables or transformer test reports.
  • They must not be the sole basis for work on life-safety systems, such as emergency generators, fire pumps or medical locations.

Your responsibility

Electrical work can cause fire, injury and death. Installation and modification of electrical systems must be carried out by competent, and where required licensed, persons in line with local law. You are responsible for checking every result before relying on it and for confirming that the inputs and assumptions are right for your application.

No warranty

We work hard to make the calculations correct (see methodology), but the site is provided "as is" without warranty of any kind. To the extent permitted by law, we accept no liability for loss or damage arising from use of the results. See also the terms of use.

Standards references

Standards are cited by name to point you to authoritative sources. Editions, national adoptions and amendments differ, and the requirements of the edition in force where you work always take precedence. Engineerly is not affiliated with IEC, IEEE, NFPA, IET/BSI or ISO.