What should the statutory provision of earthing?

What should the statutory provision of earthing?  
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1 Answer

Answer :

a. Earthing shall generally be carried out in accordance with the requirement of India electricity rule 1956, as amended from time to time and the relevant regulations of the electricity supply authority concerned. 

b. All medium voltage equipment shall be earthed by two separate and distinct connections with earth. In the case of high and extra high voltages, the neutral points shall be earthed by not less than two separate and distinct connections with earth, each having its own electrodes at the generating station or substation and may be earthed at any other point provided no interference is caused by such earthing. If necessary, the neutral may be earthed through suitable impedance. 

c. As for as possible all earth connections shall be visible for inspection. 

d. All connections shall be carefully made. If they are poorly made or inadequate for the purpose for which they are intended, loss of life or serious personal injury may result. 

e. Each earth system shall be so devised that the testing of individual earth electrode is possible. It is recommended that the value of any earth system resistance shall be such as to confirm with the degree of shock protection desired. 

f. It is recommended that a drawing showing the main earth connection and earth electrodes be prepared for each installation. 

g. No addition to the current carrying system, either temporary or permanent shall be made which will increase the maximum available earth fault or its duration until it has been ascertained that the existing arrangement of earth electrodes, earth bus-bar etc. are capable of carrying the new value of earth fault current which may be obtained by this addition. 

h. No cut-out link or switch other than a linked switch arranged to operate simultaneously on the earthed or earthed neutral conductor and the live conductors, shall be inserted on any supply system. This however, does not include the case of a switch for use in controlling a generator or a transformer or a link for test purposes. 

i. All materials fittings, etc. used in earthing shall conform to Indian standard specifications, wherever these exist. 
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