Cable Derating Calculator
Supply the reference document, version, material, insulation, installation and temperature context, then enter your factors.
A QUICK WALKTHROUGH
How to use this tool
- Enter the required reference context and choose a mode.
- Enter documented ratings and labeled positive factors.
- Calculate, review every row and save the fixed result report.
Scope
This is arithmetic planning from user references. Factors must be independent and sourced for the same context; values above 1 are allowed when your reference supports them. No built-in code tables, automatic factor selection or compliance approval is provided. Normative lookup requires a licensed, versioned dataset and matching installation context.
Formula
k = ∏ fᵢ; B′ = B × k; Bmin = I / k
GOOD TO KNOW
Common questions
Does this certify cable selection?
No. The comparison only uses supplied ratings and factors. It does not evaluate protective devices, voltage drop, short-circuit duty or regulatory suitability.