ELECTRICIAN 1st YEAR MODULE – Wiring Installation and Earthing

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1. Why is AC supplied for earth resistance measurement?

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2. What is the advantage of crimping?

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3. Where is system earthing done?

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4. Which earth resistance measurement method is illustrated?

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5. For which electrical equipment are 'L' series type MCBs used?

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6. Which method is used to reduce earth resistance value in an existing earth pit?

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7. Which instrument is used to test new domestic wiring installation?

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8. What determines ohmmeter needle deflection in earth testers?

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9. What causes lamps to glow dim and motors to run slow in domestic wiring?

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10. How can earth resistance be reduced?

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11. What is the maximum permissible load for a power sub-circuit as per IE rules?

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12. In which wiring installation is system earthing done?

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13. Advantage of stranded conductor over solid conductor?

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14. What type of test is conducted in domestic wiring installation?

 

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15. Why is AC required to measure earth resistance using an earth resistance tester?

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16. What is the permissible leakage current in domestic wiring installation?

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17. Where are service connection supply leads connected in a consumer main board?

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18. What is the megger reading in a dead short wiring installation?

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19. What type of test is performed in wiring installation?

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20. How to control harmonic distortions in neutral connections per IE rules?

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21. Why does megger's pointer not stabilize at zero when unused?

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22. What is the formula to find voltage drop in an AC single-phase wiring circuit?

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23. What happens when a person receives a 20mA shock current?

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24. What is the minimum size of copper earth continuity conductor used in single-phase domestic wiring as per BIS?

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25. What is the function of current reverser in earth resistance testers?

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26. Why is system earthing different from equipment earthing?

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27. Which principle does the earth resistance tester work on?

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28. What test is carried out using a megger?

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