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.

AVAILABLEAUTOMATED CHECKS ONLYSTANDARDS-AWAREINTERMEDIATENECWHAT DO THESE STATUSES MEAN?

NEC 110.9 / 110.10AIC vs SCCRCURRENT-LIMITING MODELNEC 2017 / 2020 / 2026

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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

Example data — not a real field report

Overview dashboard with AIC and SCCR pass/fail — Overview — enter available fault current and pick a preset scenario; the Compliance Dashboard returns pass/fail on both the device AIC and the assembly SCCR side by side.

Detailed results with sensitivity analysis — Results — sensitivity view showing how compliance changes as available fault current rises or falls, plus the Equipment Comparison Explorer for evaluating alternates at the same AFC.

Step-by-step calculation trace — Calculation Trace — the exact NEC 110.9 / 110.10 logic flow applied to your inputs, with each check labeled and justified.

Design Challenge with graded scenarios — Design Challenge — pick a target rating and mitigation strategy for a randomized scenario; the tool grades the design against the AFC.

Code references for NEC 110.9 and 110.10 — Code / References — the NEC sections that govern AIC and SCCR, with edition-specific notes for 2017, 2020, and 2026.

Learn and quiz section — Learn & Quiz — the AIC vs. SCCR distinction, current-limiting fuse behavior, series ratings, and a short quiz to lock in the concepts.

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

Try a guided scenario

Screen an assembly against available fault current.

SCCR and interrupting ratings · Arc Flash & Electrical Safety

No sign-in required. Progress is saved on this device.

What this lab is not

Not a design document, stamped calculation, or approval record.
Not a substitute for engineering analysis by a licensed professional.
Not a reproduction of NEC tables — values are computed and cited, and you must verify against the code edition enforced in your jurisdiction.
Not connected to live equipment and not a safety device.

Calculation basis

References NEC. Results are computed from the entered inputs and cited back to the referencing clause or table number — no code text or table is reproduced verbatim.

Simplifying assumptions are stated in the lab itself; where a model is intentionally conceptual, the lab says so rather than implying study-grade accuracy.

Standards basis: Standards-aware. Validation state: Automated checks only (last checked 2026-08-15).