Disclaimer

Educational use only

The calculators and guides on AmpWireSize are provided for education and general planning. They are not engineering advice, a design, or an installation plan for any specific building or vehicle.

Verify with a licensed electrician and local code

Always confirm wire size, breaker rating, and voltage drop with a licensed electrician and your local electrical code before you buy materials or make a connection. Electrical codes vary by country, region, and even by city, and they change over time. Local rules and the manufacturer's instructions take priority over anything on this site.

Simplifications in the tools

Some calculators do not apply every adjustment that a full design would need. For example, a tool may ignore certain ambient temperature, conduit fill, or grouping derating factors. Where that is the case, the page should say so, but you are responsible for checking whether those factors apply to your installation.

No warranty

The site and its content are provided "as is," without warranty of any kind, express or implied. We do not guarantee that any result is accurate, complete, or suitable for your purpose. To the fullest extent permitted by law, the publisher is not liable for losses, injury, or damage that result from using this information.

If you are unsure about any electrical work, stop and get help from a qualified professional.