A4. A current transformer (CT) is described as 10VA 10P20. (a) State the meaning of 10VA 10P20. (3 marks) (b) State the function of the above-mentioned CT. (3 marks) (c) Draw a schematic diagram showing the connections of overcurrent relays and earth fault relays by using 4 nos, current transformers in a 3-phase system. (6 marks) AS. Briefly explain why high voltage distribution systems are recommended for achieving energy efficient design of electrical installations in high-rise buildings