Engineering disclaimer

GridCircuits calculators, articles, publications and downloads are provided for education, estimating and preliminary design. They are not a substitute for professional engineering judgement.

• Results depend on the inputs and assumptions shown on each page. Check that they match your installation.
• Codes and standards change and are adopted differently by each jurisdiction. Always confirm against the edition that applies to your project.
• Final designs, equipment ratings and safety-critical decisions must be reviewed by a qualified, licensed engineer.
• Standards are summarized and cited by clause. For the authoritative text, refer to the publisher (NFPA, IEEE, IEC).

We work hard to keep every tool accurate and test each one against worked examples. If you find an error, please email contact@gridcircuits.com and we will correct it promptly.