ElecAS
Cable Correction Factor Calculator
Apply ambient, grouping, soil and installation condition factors to cable current-carrying calculations.
Why this page matters
Apply ambient, grouping, soil and installation condition factors to cable current-carrying calculations. This static content is published so the canonical route has meaningful crawlable HTML even before the interactive application hydrates.
Who this page is for
Users adjusting cable current-carrying capacity for temperature, grouping and installation environment.
Relevant standards
- AS/NZS 3008
What this tool helps with
- Review ambient, grouping and soil-related derating factors.
- Support cable selection decisions with environment-specific adjustments.
- Move directly to cable sizing once correction factors are understood.
Frequently asked questions
What is a cable correction factor?
- A correction factor is a multiplier applied to a cable's base current-carrying capacity to account for installation conditions that differ from the reference conditions in AS/NZS 3008.1.1 — typically ambient temperature, grouping, soil thermal resistivity and depth of burial.
How do I combine multiple correction factors?
- Multiply the factors together: derated capacity = base capacity × k1 × k2 × k3 × k4. The result must remain at or above the design current.
When does grouping derating apply?
- Grouping derating from AS/NZS 3008.1.1 Tables 22–24 applies when multiple loaded cables are installed touching or in close proximity (in trays, conduits, or enclosed runs). Spacing of at least one cable diameter between cables can avoid the derating.