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11 free tools NIBT 2020 / SIA 380/4 / EN 12464-1
Illuminance calculation and number of luminaires
Lumen method per EN 12464-1 / SIA 380/4. 27 room types, 4 arrangements. Real-time luminaire layout preview.
Cable cross-section calculation (NIBT 2020)
Sizing Iz × Kt × Kg + ΔU%. 11 installation methods, automatic parallel cabling for Ib > 1200 A.
Voltage drop calculation ΔU%
Single-phase 230 V / three-phase 400 V / DC. NIBT thresholds 3 / 5 / 6 / 8 %. Three-state compliance.
Circuit breaker + curve + RCD selection
Rating, B/C/D curve, 30 mA RCD type A/F/B. 9 circuit profiles per NIBT 4.3 / 4.1.5.3 / 7.22.
CAN 2026 catalog search
CAN 2026 quote editor: fast entry by code or by image, special items, remarks. Catalogue search pending distribution authorization.
Power calculation P, I, U
Single-phase / three-phase / DC. Dynamic P/Q/S triangle. cos φ + efficiency η.
Three-phase current calculation Iₙ
I = P/(√3·U·cosφ·η). Direct-on-line / star-delta / soft start motor starting.
Ohm's law U I R P
DC / AC. E12 resistor suggestion for LEDs. Interactive triangle of quantities.
Electrical unit converter
8 categories: kW⇄kVA, mAh⇄Wh, V/A/Ω/F/H/C. Two-way live input.
Joule losses + annual cost
P = R·I² for the round trip. Energy kWh/year + cost CHF/year. Savings recommendation: one cross-section up.
Cos φ correction — capacitors
Q = P·(tanφ1 − tanφ2). Capacitances in µF single-phase / star / delta. ROI in months.