State significance of earthing. Draw and explain pipe earthing. State the values of earth resistances for : (i) Substation (ii) Residential wiring (iii) H.T. Line (iv) L.T. Line

State significance of earthing. Draw and explain pipe earthing. State the values of earth resistances for : (i) Substation (ii) Residential wiring (iii) H.T. Line (iv) L.T. Line
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1 Answer

Answer :

Significance of earthing:  * Earthing means connecting the body of the electrical equipment (it means the part which does not carries current under normal condition) to the earth. For example electrical equipment’s frames, enclosures, supports etc. * The purpose of earthing is to minimize risk of receiving an electric shock if touching metal parts when a leakage current is present. Earthing has been done through bonding of a metallic system to earth with the help of wire. It is normally achieved by inserting ground rods or other electrodes deep inside earth. * Earthing is to ensure safety or Protection of electrical equipment and Human by discharging the electrical leakage current to the earth. * Generally Green wire is used for this as a nomenclature. 


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Pipe earthing – This type of earthing is used in rocky area where excavation is not possible for copper plate earthing. The pipe used is generally of 38 mm diameter 2.5m long. The total depth of earthing is about 3.75m.surrounded by charcoal and salt. 


the values of earth resistances for: 

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Description : Study the given figure below and answer the question that follow important-questions-for-class-12-biology-cbse-fertilisation-pregnancy-and-embryonic-development-t-33-3 (i)Name the stage of human embryo the ... implantation in the uterus. (iv)Where are the stem cells located in this embryo? -Biology

Last Answer : (i)The stage is blastocyst. (ii) A—Trophoblast. It helps in attachment to endometrium during implantation and provides nourishment to developing embryo. (iii) Inner cell mass acts as precursor to embryo ... into ectoderm and endoderm. (iv) Stem cells are located in inner cell mass of embryo.

Choose the option that lists the set of statements that are NOT TRUE according to the poem. I. The tiger is in quiet rage because he has been imprisoned. II. A tiger is caged and kept in the zoo. III. He criticises the brilliant stars from behind the bars. 1V. The poet alternates between the description of a caged tiger and a tiger in jungle. V. Tiger shouldn‘t have been prowling at the jungle‘s edge. (a) II & V (b) I, IV & V (c) I, II & III (d) III & V

Description : Choose the option that lists the set of statements that are NOT TRUE according to the poem. I. The tiger is in quiet rage because he has been imprisoned. II. A tiger is caged and kept in the zoo. III. He criticises the brilliant stars ... edge. (a) II & V (b) I, IV & V (c) I, II & III (d) III & V

Last Answer : (d) III & V

What convincing argument was made by Anne? i) She was talkative just like any other student in the class. ii) She had the right to be talkative, as it was a classroom and not a prison. iii) She had inherited the trait from her mother, so couldn‘t stop being talkative. iv) She found it impossible to be quiet like the others as she couldn‘t change herself.

Description : What convincing argument was made by Anne? i) She was talkative just like any other student in the class. ii) She had the right to be talkative, as it was a classroom and not a prison. iii) ... being talkative. iv) She found it impossible to be quiet like the others as she couldn t change herself.

Last Answer : iii) She had inherited the trait from her mother, so couldn‘t stop being talkative.