Elektro Pirnat Calculator

Elektro Pirnat Calculator helps you size a cable and protective device, or assess the load an existing circuit can carry. Enter your circuit details, review clear results and see the assumptions behind the calculation. CABLE AND PROTECTION Enter the load power, supply type and route length. The app calculates current and selects a cable and a supported standard protective rating using cable ampacity and your voltage-drop limit. The results bring current, cable size, protection and voltage drop into one clear view. Power presets simplify entry for EV chargers, induction hobs, water heaters and electric heaters. For a heat pump, use the manufacturer's electrical input power. For a three-phase motor, enter mechanical output power and efficiency. MAXIMUM LOAD For an existing cable, select its cross-section and supply type, then enter route length and the protective device's rated current. See maximum circuit current and electrical input power within the supported model, cable ampacity and the highest supported protective rating. The limiting factor is shown, and protection exceeding cable ampacity is clearly flagged. UNDERSTAND THE ASSUMPTIONS • Copper and aluminium conductors with PVC 70 °C insulation. • Installation methods A1, A2, B1, B2, C, D1 and D2 for supported combinations. • 230 V single-phase and balanced 400 V three-phase supplies. • Two or three loaded conductors selected automatically from the supply type. • Power factor, conductor material and installation settings in Advanced. • Calculation details, assumptions, methodology and scope limitations. Supported table entries cover copper from 1.5 to 35 mm² and aluminium from 2.5 to 35 mm². Aluminium/D2 combinations from 2.5 to 10 mm² are not supported. Calculations use reference conditions: 30 °C air or 20 °C ground, one circuit and no additional grouping. Available in Slovenian, English and German, with light and dark themes. The app contains ads and offers a one-time purchase to remove them. SCOPE Results support preliminary sizing. The app does not verify an installation's complete safety or compliance, protection against electric shock, short-circuit capacity or every special installation condition. A qualified person should check the final selection against the actual installation, applicable national requirements and measurements.

Refined, consistent input screens for both calculators. Clearer cable sizing and maximum load results with four key values. Improved assumptions and explanations in Slovenian, English and German. Light and dark theme refinements and Android compatibility improvements.