Download our free Cable Sizing Formula Cheat Sheet (PDF) — [Link to resource]
The cable must be able to handle more current than the breaker, and the breaker must handle more current than the load. formula for cable sizing
30 kW, 415V 3-phase, PF=0.85, length=120m, XLPE insulated copper cable, ambient 40°C, single circuit in conduit. Download our free Cable Sizing Formula Cheat Sheet