Disclaimer

The short version

Every calculator here is sourced from published standards, unit-tested against worked examples and read by a working electrician before it is published. None of that makes it a substitute for the governing standard, your local authority, or the judgement of the qualified person responsible for the installation. Use the result to check your thinking, then verify it against the code that actually applies to your job.

What a calculator cannot know about your installation

A form with six inputs models a situation that has a hundred. Each page states its assumptions, but the general shape of the gap is always the same:

• Conditions. Ambient temperature, grouping, insulation, burial depth, solar gain and enclosure type all change an answer, and a calculator only accounts for what you told it.
• Existing work. The state, age and rating of what is already in the wall, the board and the ground is invisible to a web page.
• Jurisdiction. Adoption of a standard is local. Codes are amended, adopted late, or adopted with changes, and a figure that is correct under one edition or one national annex can be wrong under another.
• Equipment listings. Manufacturer instructions and equipment listings can be more restrictive than the code, and where they are, they win.

Standards and editions

Each calculator cites the standard it is built from and, where the figure is edition-specific, the edition it was taken from. Standards move: tables are revised, articles renumbered, documents withdrawn. We re-review pages when a cited standard changes, but a page you are reading may predate a revision that affects it. The published standard is always the authority; this site never is.

The full sourcing and review process is set out in the methodology and editorial policy.

Safety

Electrical work kills people who know what they are doing, which is the whole reason a competent-person requirement exists. Nothing on this site should be read as encouragement to carry out work you are not qualified, equipped and legally permitted to carry out. Where the law requires notification, inspection or certification, a calculator result is not any of those things.

Where responsibility sits

ElectroCalculators is provided free, as-is, with no warranty of any kind — express or implied — as to accuracy, completeness, fitness for a particular purpose, or suitability for any specific installation. To the fullest extent permitted by law, we accept no liability for any loss, damage, injury or cost arising from use of, or reliance on, anything published here. Responsibility for a real installation sits with the qualified person specifying and carrying it out.

That is the standard clause, and it is worth saying what it is not: it is not a reason for us to be careless. The methodology describes what we do to make these numbers right, and the corrections policy commits us to fixing them when they are not. A disclaimer is what remains after that effort, not a substitute for it.

External links

Pages link to standards bodies, manufacturers and reference material so you can check our sources. We do not control those sites and are not responsible for their content. No link is a paid placement or an affiliate link — there are none anywhere on this site.

Embedded calculators

Calculators embedded on other sites run the same code and carry the same limits. If you embed one, this disclaimer applies to your readers too, and the attribution link is how they get to it.

Found something wrong?

Tell us. A confirmed error is fixed, a test is added so it cannot return, and the page is re-reviewed. Error reports are answered before anything else: [email protected], or via the contact page.