EzSCCR Calculator

EzSCCR Calculator helps electrical panel builders, machine manufacturers, and control panel engineers determine the Short-Circuit Current Rating (SCCR) required for industrial equipment — quickly, on the shop floor or in the field. WHAT IT DOES Enter your transformer, feeder, busway, and branch circuit details, and EzSCCR Calculator computes the available symmetrical fault current at the point of installation — then compares it against your machine's rated SCCR to confirm compliance. STANDARDS SUPPORTED - UL 508A / NEC (North America) - IEC 61439 / JIS C 8480 (International) Switch between standards and languages (English / Japanese) at any time. KEY FEATURES - Facility transformer impedance, with optional manufacturing tolerance (ANSI C57.12.00) - Optional utility source impedance (defaults to a conservative infinite-bus assumption) - Feeder cable, busway, and branch circuit conductor impedance - Optional motor contribution estimate - Clear pass/fail verdict with margin, impedance breakdown, and full calculation detail - Universal app — works on iPhone and iPad PROFESSIONAL REPORTS Generate a clean, one-page technical report — not just a screenshot of the app. Add your customer name, machine model, and serial number, plus your company name, logo, and contact information for a proper letterhead. Save or share as a PDF directly from your device. PRICING EzSCCR Calculator is free to download and use, including all calculation features. Printed and PDF reports include a watermark until you remove it with a one-time in-app purchase — no subscription, ever. IMPORTANT Results are theoretical estimates based on the values you enter. They are not a substitute for a measured or engineered short-circuit study, and final installation decisions should be verified by a qualified person in accordance with applicable codes (NFPA 70 / NEC or IEC 60909, as applicable). CALCULATION HISTORY Each time you print or save a PDF, the inputs and results are saved as a record on your device. Browse past calculations, restore any record to the form, and reissue the report at any time. Add an optional revision note to track changes, and the note is printed on the report. Records are stored on the device and included in standard iCloud device backups. Calculation History is available with the Remove Watermark purchase.