A An Earthing System Connects Specific Component Of An Electrical Power System With The Ground For Safety Purposes I 1 (41.85 KiB) Viewed 51 times
(a) An earthing system connects specific component of an electrical power system with the ground for safety purposes. (i) Explain the three (3) purposes of having a good earthing system in building installation. (i) Sketch a logical condition of three phase lines that are using the "Combine Neutral Earthing" (TNC) type earthing arrangement with an appropriate explanation.
(b) The purpose of primary protection devices is to protect installations against overvoltage such as direct strokes of lightning. (i) Sketch and explain with an appropriate label representation of overvoltage characteristics (plot voltage versus time). (ii) With the help of appropriate illustration, describe three (3) types of primary protection that can be used as protection scheme for a building.
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