If you only know the wattage of your device, use the Power Law to find the Amps: Three Phase: (Where is Power in Watts and PFcap P cap F is Power Factor, usually 0.8 to 1.0). Step B: Select a Preliminary Cable Size
Calculating the "technically correct" size is the minimum requirement. However, calculating the "economically optimal" size is the next level. calculate size of cable
The main steps:
exceeds your limit (e.g., 6.9V for a 230V circuit), you must move up to the next larger cable size and recalculate. 3. Consider Correction Factors (Derating) If you only know the wattage of your
Is the cable in a conduit, clipped to a wall, or buried underground? Cables in conduits dissipate heat slower than those in open air. 4. Why You Shouldn't Guess Using an undersized cable leads to Joule Heating ( I2Rcap I squared cap R The main steps: exceeds your limit (e
Calculate the voltage drop for the size selected in Step 4.
25 mm² Cu/XLPE cable is suitable.