There are five different methods of laying cables e.g. (a) Laying direct in ground, (b) Drawing in ducts, (c) Laying on racks in air, (d) Laying on racks inside a cable tunnel and (e) Laying along buildings or structures.

Direct laying is applied in open soil. Draw in the system is applied in congested areas and for underground railway crossing etc. were frequent excavation is inconvenient. The solid system is not used is not used nowadays. Laying on brackets, racks and clears is used inside the building, factories, substation, power station & tunnels etc.

1. What is called “Barrier joint” of cable ?
2. Interview Question of Underground Cable
3. What are varnished cambric insulated cables ?
4. What do you mean by XLPE cable and what are its advantages over conventional cables ?
5. What do you mean by MIND cable and where is it used ?
6. What do you mean by the term “Sheath losses” ?
7. What is the procedure of reducing the sheath losses in sheaths of the three single core cables in a 3-phase system ?
8. What do you mean by the term “Dielectric losses” ?
9. What do you mean by thermal resistance of a single core cable ?
10. What are the load conditions of an underground cable ?
11. what special cares are to be taken for storage of cable drum ?
12. What are the methods of cable laying ?
13. What is soil thermal resistivity ?
14. What is proximity effect ?
15. What are the procedures to be adopted for determining the types of cable faults ?
16. What precaution should be taken while taken a cable through trenches in the following locations (a) Road crossing, (b) Railway crossing & (c) Crossing of water mains ?
17. What is called “Heat shrinkable joint” of cable?
18. What can be the causes of damage to PVC cables and paper insulated cables?