Analysis and advice for electrical problems

Understand the problem:

This problem provides information about a $3-$phase, $4-$wire, $230/400$ volt electrical system with $3$ main load types:

Lighting sub$-$circuits: There are $12$ circuits, each circuit uses $1200$ VA

Special sub$-$circuit $3$: Uses $2000$ VA

Socket circuits: There are $6$ circuits, using a total of $1500$ VA

What the problem requires:

Feeder size: Refers to the size of the wire used to supply power to all loads

Protection equipment: Refers to equipment used to protect the electrical system, such as fuses, breakers

Load Schedule: This is a table that shows details of each load, such as load name, electrical power, and electrical current.