![]() One of the disadvantages of copper wiring is its cost.Ĭopper is stronger than aluminum. Overall all it is more durable and performs better than aluminum wiring. ![]() Which wire is better Aluminium or copper?Ĭopper wiring is more stable than aluminum and smaller conductors are needed to transmit power loads. Apply our equation, Current carry capacity of 35 sqmm bar= 0.8* 35 = 28 Amps.ħ. Let's have a simple example of a 4 sqmm bus bar. Use 1 AWG copper or 1/0 AWG aluminum for the current-carrying conductors.Īluminum current-carrying is equal to 0.8 times the total volume of the aluminum (length*breadth*thickness). What size aluminum wire is good for 100 amps? VDI = AMPS x FEET ÷ (% VOLT DROP x VOLTAGE)ĭetermine the appropriate wire size from the chart below.Ĥ00 amp service requires a wire size of 1,000 kcmil.ĥ. How do you calculate copper wire size?Ĭalculate the Voltage Drop Index (VDI) using the following formula: ![]() This is your target resistance, measured in ohms. If, for instance, 120 volts will act on the cable, and you want 30 amps to run through it: 120 / 30 = 4. How do you calculate electrical cable size?ĭivide the voltage running through the cable by your target current.
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