cross sectional area of cable * voltage drop
Voltage determines a cable's insulation thickness, not its conductor thickness (or, more accurately, its cross-sectional area). It's current that determines the csa of a conductor, not voltage.
It depends on its cross-sectional area, its construction, and how it is laid.
The voltage drop on a 1.5 mm cable run of 1.5 kilometers will depend on factors such as the current flowing through the cable, the material of the cable, and the temperature. Typically, to calculate voltage drop, you can use the formula: Voltage drop = (2 x current x length x resistance) / cross-sectional area.
The factors that affect the speed of current flow include the material through which the current is flowing (conductivity), the cross-sectional area of the conductor, the voltage applied, and the resistance in the circuit. A higher conductivity material, larger cross-sectional area, higher voltage, and lower resistance will result in a faster current flow.
100 kw is the power drawn by the load. to calculate the cable size you need to know the voltage. From that you can calculate the current. this decides the cable size. for example if the voltage is 400Volts then the current flowing in the circuit when the load is 100 KW will be 250 amps. (100,000/400). for 250 amps to flow with out causing excessive heating of the cable the cross sectional area of the copper cable should be 150 sq mm.for a round cross section the diameter will be roughly 15mm.
if your load draws a max of 15 amps then you would use 14-16 gauge wire. the lower the gauge the more current that is allowed to pass. there are charts that show max current for diameter of wire
Simply work out the area of a section of cable.........
You can measure its diameter with a micrometer. For this the cable does not have to be vertical.
Conversion of cable diameter to circle cross-sectional area and vice versa. Scroll down to related links and look at "Conversion of cable diameter to circle cross-sectional area".
The size of a current is determined by the voltage applied, the resistance of the circuit, and Ohm's Law (current = voltage / resistance). The type of conductor material used, the temperature, and the cross-sectional area of the conductor also affect the size of a current.
Resistance (Ohms) = Voltage (v) / Current (I)
Electrical resistance is measure in Ohms. A function of voltage divided by current. It is also dependant on the length and cross sectional area of the conductor.