Formulas
Single-phase current
I = P / (U × PF)2 kW HMI @ 230 V, PF 0.85 → 10.2 A
Three-phase current
I = P / (√3 × U × PF)18 kW balanced @ 400 V → 27 A per phase
Generator size
kVA = kW / PF × 1.2512 kW tungsten → 15 kVA
Voltage drop (mono)
ΔU = 2 × ρ × L × I / S50 m · 16 A · 2.5 mm² → 14.7 V (6.4 %)
Quick rule @230 V
1 kW ≈ 4.5 A5 kW ≈ 22 A
Quick rule @120 V
1 kW ≈ 8.5 A2 kW ≈ 17 A
Connectors (CEE / P17)
Schuko / 16A P1716 A3.6 kW @230 V
P17 32A32 A7.3 kW mono · 22 kW tri
P17 63A63 A14.5 kW mono · 43 kW tri
P17 125A125 A86 kW tri
Powerlock400 A275 kW tri