Faq's
  Useful Electrical Formulae
  Common Conversional Factors

 


Cables

1. What are different elements of a Cable?
2. Basic about cable components & constructional details
3. What are the type designations of cable?
4. Nomenclature of the cables
5. What are different cable types and categories?
6. Comparison of XLPE cables with PVC cables
7. What is screening in cable and why it is required?
8. What is FRLS H cable?
9. What are the general Packing practices followed?


 Conductors

10. What are the different Conductor materials used as conductor?
11. What is the criterion for selecting particular type of conductor?
12. What are the different types of conductor?


 Insulation of Cables

13. What are different types of insulating material?
14. List the important properties of cable insulation.
15. What are thermoplastic and thermoset materials?
16. What is the function of Conductor / Insulation Screen and material used?


 Protection of Cables

17. What is armour and why this is required in a cable?
18. What are different materials used for armouring?
19. In single core cable, why non-magnetic material is used?
20. What are different armour types and functions of the same?
21. Which armour type is generally used for different cable types?
22. What is an Outer sheath?
23. What are the different materials used for sheathing?
24. What are the functions of Metallic Sheaths used in cables?
25. Comparison between Lead sheath and Aluminium sheath used in cables


 Testing of Cables


26. Define Type tests, Acceptance tests, Routine tests and Optional tests.

27.
What are the typical tests performed as
Type/ Routine/ Acceptance / Optional tests ?

28.
What is the significance of following tests?

    1. Annealing test
    2. Armour resistance test
    3. Bending test
    4. Cold bend test
    5. Conductor resistance test
    6. Flammability test
    7. High voltage test
    8. Insulation resistance
    9. Impulse Test
    10. Loss of Mass Test
    11. Partial Discharge Test
    12. Tensile test
    13. Wrapping Test (for Aluminium wires)
 Cable Accessories

29. What are the different types of cable accessories?

30. What are the objectives to be achieved by Termination Kits?
31. What are the objectives to be achieved by joints?
32. List down the various types of cable accessories.
33. Explain Heat Shrink technique
34. Explain Cast Resin technique


 Cable Characteristics

35. What is current carrying capacity of the cable?

36. What factors affect cable current carrying capacity?
37. What is Short circuit rating of the cable?
38. Calculation of Short Circuit Rating
39. What are different losses in Power cables?
40. What are the factors affecting cable selection?



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