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Q8. With reference to shipboard electrical distribution systems:

(a) Describe the meaning of the term earth fault;(2)

(b) Explain the meaning of the term earth-bonding and why it is required;(3)

(c) Sketch a circuit diagram of one arrangement for detecting phase to earth faults in an earthed neutral system; (6)

(d) Calculate the value of a neutral earthing resistor (NER) to limit the earth fault current to the full load rating of a 2 MW, 0.8 p.f., 3.3 kV, three-phase generator. (5)