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πŸ”Œ Cable Calculator

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Calculator
Saved reports
Datasheet data
⚠ Cable ratings are loaded from BS 7671 but not yet independently verified β€” spot-check the values against the book before relying on any report.

Report details

Load & supply

Protective device

Cable

Installation environment

Earth fault loop

Uoc is the source open-circuit voltage used for max-Zs & fault-current (BS 7671 Cmin method uses 230 Γ— 0.95).

Result

β€”

    Key figures

    Checking aid only. Every figure must be verified by a competent person against BS 7671 and the manufacturer's data before use. Correction-factor and current-carrying-capacity values come from the datasheet data you maintain β€” they are not reproduced from BS 7671.

    Saved reports

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    Datasheet reference data

    These are the current-carrying capacities (Iz, A) and voltage-drop (mV/A/m) values the calculator looks up, plus the correction-factor tables. Enter your own manufacturer datasheet values here. The calculator never invents these β€” a missing value is reported as "no data", never a silent pass.

    Correction factors

    Saved data replaces the sample set for everyone. Values apply exactly as entered β€” verify them against the current manufacturer datasheet and BS 7671 Appendix 4 reference methods.

    πŸ“₯ Import cable ratings from a datasheet

    Paste rows copied from a datasheet/spreadsheet, or upload a .csv/.xlsx. Nothing is saved until you review the grid and press Save datasheet data. Everything stays on your device until then.

    A datasheet current-rating table usually has one Iz column per reference method β€” tag each one. Leave a column as "β€” ignore β€”" if it isn't an Iz column.
    This merges into the grid on the Datasheet-data tab. Review it there, then Save datasheet data to store it against your portal (not the public code).