How It Works
A summary of calculator inputs, formulas, source data, tests, and stated limits.
Choose the calculation you need
AU Wiring groups tools around electrical installation tasks such as load estimates, cable checks, containment, fault calculations, and fixed supply equipment.
The calculator page tells you what to enter, which units are accepted, what the result means, and where the estimate stops. If you do not have the required input, the right next step is to measure it or obtain the manufacturer data, not to guess.
Inputs and units
Inputs are labelled with units and ranges where required. Defaults are examples, not installation recommendations. Use values from current cable, equipment, supply, and standards sources when those values affect the result.
Use a consistent calculation basis. Where a result depends on cable construction, protective-device data, fault duty, or installation conditions, the calculator states its simplifying assumptions and limits.
Formulas and results
Each calculator is a fixed calculation over the inputs shown on the page. After a calculation, the Formula section exposes the symbolic formula and the substituted values used for the result. The formula panel starts collapsed so the result stays easy to scan, but the working is available when you need to audit it.
A numeric result does not prove that an installation complies with current requirements. Compare it with current wiring rules, supply authority conditions, equipment data, and installation details before using it in design or installation.
Reference data and assumptions
- Manufacturer ratings, dimensions, prices, and material properties remain the controlling source for the exact part. Replace any illustrative value with the current published value before relying on the result.
- Where a calculator uses a reference table or a representative coefficient, the page identifies the source or explains what the value represents. A table helps organise a comparison; it does not certify a product.
- Simplifications are stated. User-entered factors, cable properties, and device ratings are not independently verified by the calculator.
Testing and corrections
Calculator definitions include independent test cases for normal values, boundaries, and failure conditions. A release is checked against those cases before it is made available. That testing verifies the stated model; it does not verify the condition of your equipment or the accuracy of a supplier datasheet.
If a page contradicts its own formula, uses an unclear definition, or contains a stale source value, send the URL and the specific issue through Contact. Verified corrections are applied to the definition or content and the affected test cases are run again.
What the calculators cannot do
Electrical estimates do not verify an installation, equipment condition, manufacturer limits, current wiring rules, supply authority requirements, or site-specific conditions. Check current source data and have design and installation decisions reviewed by an appropriately qualified person.