Electrical's guyys help me.?

Question

Hello friends

i m an electrical engineering student.

i want to know that, There is any method to find electrical cable's "DIA METER" or size, If current rating is given.

Answer 1

The NFPA 70 (NEC) has look up tables for conductors. There is a table for conductor properties which give the Area (cmils)and diameter verses the wire size (AWG). For each type of wire there is an associated ampacity. So It should be pretty easy. But you  need to know the type of conductor, (THHN, MTW, copper, Al, stranded etc) .