License — Creative Commons Attribution 4.0 (CC BY 4.0)
The content — text, formulas, reference tables, and worked examples — is published under the Creative Commons Attribution 4.0 International licence. You are free to copy, share, and adapt the material for any purpose (including commercial), as long as you give appropriate credit and indicate any changes you made.
What CC BY 4.0 means
Creative Commons Attribution 4.0 International is the most-permissive Creative Commons licence. You may:
- Share — copy and redistribute the material in any medium or format
- Adapt — remix, transform, and build upon the material for any purpose, even commercially
The site cannot revoke these freedoms as long as you follow the licence terms.
Conditions you must satisfy
Attribution. You must give appropriate credit to the site, provide a link to the source page, link to the CC BY 4.0 licence, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests we endorse you or your use of the material.
An acceptable attribution: "Adapted from this site (https://codepass.pro/voltage-drop/), licensed CC BY 4.0." If you reproduce the content without modification, omit "Adapted from".
No additional restrictions. You may not apply legal terms or technological measures that legally restrict others from doing anything the licence permits.
What is and isn\'t covered
| Item | Coverage |
|---|---|
| Page text, formulas, worked examples | CC BY 4.0 — free to share / adapt with attribution |
| Site reference tables (compiled from primary standards) | CC BY 4.0 with attribution — but original standard data remains owned by the publisher |
| the calculator algorithms (TypeScript modules) | MIT licence (separate from content) — see project repository |
| Site custom illustrations and SVGs | CC BY 4.0 |
| Direct quotations of NEC, AISC, ASCE, IEC, AS/NZS, NEMA, IEEE clauses | Owned by the respective publishing body. Reproduced under fair-use / fair-dealing for educational reference. Not relicensable here. |
| Wikipedia / Wikidata sameAs links in schema markup | Wikipedia content is CC BY-SA 4.0; Wikidata is CC0 |
| Site name, logo, and brand identity | Trademark — not granted by CC BY 4.0 |
Why CC BY 4.0
The site exists to remove friction between an engineering question and the right answer. Choosing the most-permissive open-content licence means our content can be quoted in textbooks, blog posts, AI assistants, training material, internal company wikis, and other reference sites — wherever it helps a practising engineer get the right number with the right citation. Attribution is the only condition because we believe correct attribution is the foundation of engineering trust: the reader should always be able to trace any number back to its original source.
Disclaimer of warranties
The CC BY 4.0 licence is provided "as-is" without warranties of any kind. The site disclaims liability for any errors in the content and for any consequences arising from its use — see the standard disclaimer at the foot of every page. The licence covers reproduction and adaptation rights; it does not transfer engineering responsibility for installations or designs based on the content.
Full licence text
The complete legal text of the Creative Commons Attribution 4.0 International licence is available at:
creativecommons.org/licenses/by/4.0/legalcode
A human-readable summary is at creativecommons.org/licenses/by/4.0/.