NEN 1010 §312
Three-phase system
Driefasen-systeem (3×230/400 V)
Also known as: 3-fasen, drie-fasen, 3fase, krachtstroom, 400v, 230-400v, 50hz, phase-conductor, line-conductor, phase-wire, fasegeleider
Three-phase system (3×230/400 V): Symmetrical AC system with three phases shifted 120° relative to each other. 400 V between phases, 230 V between phase and neutral. Standard in residential connections ≥3×25 A (heat pump, charger) and all utility applications. Line current = power ÷ (√3 × 400 V × cos φ).
Practical example
Three-phase system (3×230/400 V) 11 kW wallbox at 3×16 A draws nominal 16 A per phase (P = √3 × 400 × 16 × 1.0 ≈ 11 kW).
Common mistake
Three-phase system (3×230/400 V). Common mistake: Unbalanced phase loads so the N conductor carries the sum of the three currents — fire risk if N is smaller than L.
See also
Related terms
In-depth guides
- → §710 Medical locations (§710) — Group 2 IT system, isolating transformer and insulation monitoring
- → §712 Solar Power Systems (PV)
- → IEC 62305-3 Separation distance of a lightning protection system (IEC 62305-3) — why an air-termination rod can't just sit close to metal
- → §551 Earthing of portable generators — floating system versus TN connection
- → NEN-EN 62034 Emergency Lighting — Automatic Test Systems (NEN-EN 62034)
- → EN 50171 / §560 Emergency lighting — central battery system (CBS, EN 50171) versus self-contained luminaires
Beschikbaar in: English, Nederlands, Polski, Русский, Українська