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Q1. With reference to shipboard electrical distribution systems:

(a) Describe the meaning of the term earth fault.

(b) Explain why insulated neutral is preferred for low voltage systems.

(c) Sketch a circuit diagram of one arrangement for detecting phase to earth faults for a star neutral earthing resistor (NER).

(d) How is the ohmic value of a NER calculated to limit the earth fault current to the full load rating of a three-phase neutral earthed A.C.generator.