when ur using single phase type of load for a 3.5core power cable .Why neutral is .5 and how much current in the neutral if we consider neutral as a reverse path for three phases.

when we r using 3.5 cable for a bldg. and put laod on each phase using the neutral and neutral is the return paht for the phase so the current of the neutral must be Ir+Ib+iY (return).But the size of the netural is .5 as comper to the phase.

when we r using single phase load and we have power cable of 3.5core with .5 of neutral and neutral is suppose to the returen path of the phase how much current will flow in the neutral.reply.

Is motor current is dependent on load.