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Q7.  With reference to shipboard electrical distribution systems:

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

(b) explain the term earth bonding of electrical equipment, stating how it is achieved; (3)

(c) sketch a circuit diagram of one arrangement for detecting phase to earth faults in a shipboard high voltage three-phase 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 neutral earthed A.C. generator (5)