(a) Explain why a building might have a three-phase supply instead of a single-phase supply. (b) Explain the relationshi

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(a) Explain why a building might have a three-phase supply
instead of a single-phase supply.
(b) Explain the relationships between current safety rating and
cable attributes. Touch upon cross-sectional area, the number of
cables, cable installation approaches, and the resultant impact on
voltage drop. If you wanted to deliver 18 A of current, and you
were not concerned about protecting your cable from damage or
ambient heat, what would be the most economical design option?
(c) Draw the ‘Power Factor Triangle’ and explain the differences
between Apparent Power, True Power and Reactive Power.
(d) Calculate the apparent power when your true power is 100 kW
and your reactive power is 10000 VAR.