Busbar sizing
Estimate conductor area from a current-density assumption. Assembly temperature rise and fault strength need separate verification.
Enable JavaScript for live calculations. Read the method and default example below.
Method and assumptions
- Area = current / assumed current density.
- Geometry, cooling, enclosure, joints, spacing, neutral harmonics and parallel-bar sharing are not modelled.
Before using the result
- No temperature-rise rating, bar arrangement or support spacing is certified by this calculation. Verify the actual assembly thermal and short-circuit performance.
Worked example
Illustrative default inputs. Enter your project values above.
- Continuous current
- 800 A
- Conductor material
- Copper
- Assumed current density
- 1.2 A/mm²
- Arrangement
- Three phase + neutral
Default results
- Area per current-carrying path
- 666.7 mm²
- Entered current density
- 1.2 A/mm²
- Assembly verification
- Required before selection
Choose a reference or send your BOQ
Compare relevant product families, then confirm the exact rating, control supply and duty. Price and availability are confirmed with your enquiry.
Technical references
These references support planning. The exact model documentation and a project-specific engineering review govern the final specification.