Fault Current Calculator (PFC) vs FaultFinder

Fault Current Calculator for iPhone and iPad is a fast, free tool for electricians, contractors, and engineers. Calculate Prospective Fault Current (PFC), Prospective Short-Circuit Current (PSCC), and Prospective Earth Fault Current (PEFC). Enter any two known values - voltage, loop impedance (Zs/Ze), or fault current - and the app instantly calculates the third. KEY FEATURES: PSCC and PEFC calculations: Calculate prospective short-circuit current for L-N or L-L faults and prospective earth fault current for L-E faults. Single-phase and three-phase support: Perform fault-current calculations for both system types. Automatic calculations: Enter any two known values to auto calculate the third. Loop-impedance calculator: Calculate Zs or Ze from voltage and prospective fault current. Formula display: See the formula used for each calculation so you can understand and verify the result. Works offline: Use the app in roof spaces, basements, plant rooms, and other locations without a signal. Dark mode and light mode: Maintain a clear display in different site conditions. 16 languages: Fully translated for electricians worldwide (af, ar, de, es, en, fr, hi, id, it, ja, ko, nl, pl, pt, ru, zh). Fast and free: A clean interface designed to deliver results without unnecessary steps. DEFINITIONS: AIC (Ampere Interrupting Capacity), often written as kAIC for kilo-Amperes, is a specific rating for protective devices that open a circuit, such as circuit breakers and fuses. SCCR (Short-Circuit Current Rating) is the maximum fault current that a complete piece of equipment or electrical assembly (like an industrial control panel, switchboard, or HVAC unit) can safely withstand without causing a hazard. Electrical calculations should be independently verified before safety-critical work. Ensure the calculated prospective fault current does not exceed the protective device's rated breaking capacity. For additional tools, upgrade to Electrical Tools & Reference, which includes calculators for kVA, Max Zs, cable sizing, and more. Pro Certs Software - trusted by electricians since 2011.

FREE FEATURES: • 10 core diagnostic flows — RCD/RCBO tripping, MCB tripping, no power, lighting faults, socket faults, intermittent faults, earth faults, neutral faults, two-way switching, nuisance tripping PRO UPGRADE (one-time purchase): • Testing Faults — 10 flows for abnormal test results • Panel & Control Faults — contactors, CTUs, hold circuits, backfeed • Heating Controls — 14 flows for programmers, stats, zone valves, wiring centres • Readings Checker — instant pass/fail for Zs, IR, RCD trip, and Ze values against IS 10101 / BS 7671 tables BUILT FOR THE FIELD: • Works fully offline — no internet required • Dark UI designed for site use • Supports Ireland (IS 10101) and UK (BS 7671) standards • No account, no sign-up, no data collection