🎉 Free launch period — every calculator, every feature unlocked, no account needed, through mid-November 2026. PDF reports carry a watermark for everyone during this period.
AAJapps
Browse calculators

Busbar & Switchgear Rating Check

Continuous ampacity from first-principles heat balance, for rectangular busbars. The temperature-rise calculation is a transparent engineering approximation, not a substitute for IEC 60890 formal type-test verification where that's required — every coefficient is exposed so you can calibrate it to your enclosure. Short-time thermal withstand and electrodynamic force check are subscriber features.

AAJappsEngineering Calculation Report

Busbar & Switchgear Rating Check

First-principles heat balance, IEC 60865-1-style

Generated

For preliminary engineering use only — always verify results against project-specific standards and a qualified engineer's review before use in a real design.

Busbar configuration

mm
mm
mm
mm
°C
A

Thermal & surface factors

Every coefficient here is an editable engineering approximation — replace with your own tested/enclosure- specific values where you have them.
mm
K

Short-time thermal withstand

Subscriber
kA
s

Electrodynamic force check

Subscriber
kA
mm
MPa

Continuous rating & temperature rise

Total cross-section (all bars)1,000.0 mm²
AC resistance (per metre)0.0197 mΩ/m
I²R loss (per metre)28.43 W/m
Calculated temperature rise ΔT17.6 K
Resulting hot-spot temperature52.6 °C
Continuous rating check✅ PASS
Estimated max continuous current at ΔT limit2,478 A

Short-time thermal withstand

k-factor used (bare conductor)159
Minimum CSA required (adiabatic)251.6 mm²
Thermal withstand check✅ PASS

Electrodynamic force check

Force per unit length
13,333.3 N/m
Bending moment
600.00 N·m
Bending stress σ
360.00 MPa
Allowable stress
32.93 MPa
Mechanical check❌ FAIL