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Q: How calculate the cable size when give current?

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Yes, you calculate the size of cable (wire) according to current of the connected load.

Cable size is determined by current. You did not provide the current, nor did you include the voltage so that we could calculate the current. Please restate the question, and include either the current or the voltage.

The formula to calculate cable size and voltage drop is Vdrop = current x distance times 2 times Ohms per 1000ft times 0.001.

cable sie for DC = (current x loop length x 0.019)/ voltage drop where 0.019 is conductivity of copper cable

4cx95mm aws which size of cable gland

To answer this question a voltage value is needed to calculate a current value.

You do not have to calculate the wire diameter, the manufacturer of the wire determines what the diameter is going to be for the specific size and current carrying capacity.

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.

First you need to find out the maximum current, for which you need to know the voltage. Once you know the maximum current, cable manufacturer provides a data sheet in which you can find out the current carrying capacity of different size of cables. You can then choose right size of cable for current equivalent to 50 HP. It also depends on the way you plan to lay the cable - underground or over head, single or multi layer, ambient temperature , also the permissible voltage drop at the end of the cable... etc Size will differ depending on whether the cable is copper or aluminum. Copper cable can take more current, compared to aluminum for the same size, generally

how can i calculate copper cable to bus bar size e.g: 300mm2 cu/pvc/pvc cable, change in to bus bar size

To answer this question the size of the cable or the amperage of the load is needed to calculate the correct wire size and connectors to fit the cable.

to calculate the cable size of a run of 30 meters long you first will have to know the current of the appliance use the voltage drop formula V d = (mVxIxL)/1000 once the voltage drop is less than 2.5% of the nominal voltage, the cable should be upsize.

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