IEC 60287 Ampacity Simulator
Estimate cable ampacity with temperature and grouping derating inputs based on IEC 60287 assumptions.
AEO summary
An IEC 60287 ampacity calculator estimates cable current capacity after temperature and grouping derating are applied.
Use this page to simulate how conductor material, insulation type, ambient temperature, and circuit grouping affect permissible cable current. It is most useful for fast planning checks before a full standards-based thermal calculation.
- Useful for preliminary ampacity and derating assessments.
- Shows both base ampacity and the final derated current result.
- Best treated as a simplified planning tool that should still be verified against the full IEC method.
Design Parameters
Simulation Results
How to read the result: base ampacity is the starting current before derating, derating factor shows how environmental conditions reduce that value, and final permissible current is the resulting allowable ampacity after those adjustments.
If the final current is below the intended load, review cable size, insulation type, grouping, and ambient assumptions before continuing the design.
⛔ High-Risk Engineering Notice:
This tool estimates values using generalized standards and assumptions. Site conditions, installation methods,
conductor grouping, ambient temperature, tolerances, and code interpretations can materially change the final
result. Treat these outputs as a preliminary engineering aid and perform project-specific verification against the
governing code, manufacturer data, and a qualified engineer before field use or procurement.
The Importance of IEC 60287 in Cable Engineering
The IEC 60287 standard provides a widely used mathematical framework for estimating the continuous current carrying capacity (ampacity) of power cables. In practice, full IEC 60287 studies require more installation detail than a lightweight browser tool can capture, so the outputs here should be treated as preliminary estimates rather than a final design package.
Thermal Modeling and Derating Factors
A cable’s ampacity is dynamically constrained by ambient temperature and circuit grouping. The temperature derating factor follows: Kt = sqrt((MaxT - AmbientT) / (MaxT - BaseT)). When multiple cables are grouped, mutual thermal interference requires additional derating coefficients.