CCA Resistance and Current-Capacity Inputs
State the copper fraction and its basis, finished conductor dimensions and measurement temperature. Use resistance data to evaluate the circuit, then assess current capacity with the actual insulation, installation, cooling and connections.
On this page
Keep material, conductor and installation quantities separate
| Quantity | Comparison basis |
|---|---|
| Copper fraction | State mass, volume or cross-sectional-area basis and layer construction |
| Conductivity or resistivity | Grade, condition, measurement temperature and material test result |
| Finished resistance | Length, actual metal section, temperature, strand/lay factors and measurement method |
| Current capacity | Insulation, ambient temperature, grouping, installation, cooling, duty and thermal limit |
| Connections | Compatible terminals/tooling, joint resistance, mechanical loading and exposure |
| Substitution permission | Applicable product specification and the design owner’s permitted material route |
Record the trial and order basis
Keep the drawing revision, sample identifiers, method, test conditions, acceptance limits and measured results together. Resolve open fields with the specification owner before comparing offers or releasing a changed construction.