Answer Posted / thowsif_emerson_csm team

Cable size is dependent upon the load(s) you wish to supply
power too. You have to know the maximum current you can be
expected to carry on a particular circuit BEFORE choosing a
cable.

Once you know the load, you need to choose a cable size
rated to carry at least that much current, preferably more
as a safety factor.

So if you are planning on running several electrical
devices with a combined current of 20 amps, you need a
cable sized to carry at least 20 amps, and slightly more.

To calculate the size of a power cable,pls refer the
following table LINK:-

http://www.electrician2.com/calculators/wireocpd_ver_1.html

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