SCCR / AIC Fault Current Compliance Checker
Check assembly SCCR and device AIC ratings against available fault current — with a sensitivity analysis, equipment comparison explorer, step-by-step calculation trace, current-limiting fuse impact, and NEC code-logic walkthrough.
Overview
SCCR and AIC compliance is one of the most frequently violated NEC requirements in industrial and commercial installations, yet the distinction between AIC (the device's ability to interrupt fault current) and SCCR (the assembly's withstand rating) is routinely confused. This checker resolves that confusion by walking you through both checks against entered available fault current: is the protective device's AIC adequate to interrupt the fault? Is the assembly's SCCR rated to withstand it? The Compliance Dashboard gives a clear pass/fail with explanatory insight. A sensitivity analysis shows how compliance status changes as available fault current increases or decreases. The Equipment Comparison Explorer allows numeric comparison of multiple equipment options at a given AFC. The Step-by-Step Calculation Trace shows the exact NEC logic flow applied. A Current-Limiting Impact section provides an educational visualization of how current-limiting fuses reduce let-through current below the prospective AFC. NEC mitigation concepts — current-limiting devices, higher-rated equipment, series-rated combinations, and upstream impedance — are explained. Supports NEC 2017, 2020, and 2026 editions and equipment types including panelboard, switchboard, MCC, and industrial control panel.
App preview
A live look at the app you'll launch — every control on the left drives the visualizations on the right in real time.
Inside the lab
What you'll do
- 01Distinguish AIC (device interrupting capacity) from SCCR (assembly withstand rating) and explain why both must be checked
- 02Determine whether a device's AIC rating is adequate for a given available fault current at the point of installation
- 03Determine whether an assembly's SCCR is adequate and identify the NEC sections that govern each check
- 04Explain how a current-limiting fuse reduces let-through current and may allow lower-rated downstream equipment
- 05Identify four mitigation paths when SCCR or AIC compliance fails: higher-rated equipment, current-limiting devices, series rating, and upstream impedance
- 06Apply the NEC code logic flow for Article 110.9 and 110.10 to a panelboard, switchboard, MCC, or industrial control panel
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