just apply the formula :-
p=v*i*cos(angle);
now you have the power rating,load so in turn power factor so you can easily calculate the value of current.
with the help of current you can chose the cable available in the market either the aluminum or copper wire
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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
6mm cable
you need the current of motor or the KW/HP rating
The generator should be about ¾ hp.
Depends on the size. You can go from a few hp to many thousands of hp.
Wire sizing is based on the amperage. The formula you need to find amperage from HP for single phase is, I = HP x 746/E x %eff x pf. For three phase I = HP x 746/1.73 x E x %eff x pf.A standard motor's efficiency between 5 to 100 HP is .84 to .91.A standard motor's power factor between 10 to 100 HP is .86 to .92.I = Amperage, E = Voltage.When you have calculated the amperage ask a electrician to look up the wire size for that specific amperage. He should have a code book and there is a list of wire sizes and amperages. The quickest way of finding the amperage is by looking on the motor's nameplate. There you will find all of the information that you need.