The Varnished Cambric cables are made in single and multi core designs either with fibrous braiding and flame proof or fire resistant finish or with the metallic or nonmetallic sheath with or without further protective covering. Varnished cambric is not sufficiently moisture resistant to be used in a wet environment without a continuous metallic covering and is suitable for operating temperatures from 70°C to 80°C. The dielectric loss of varnished cambric insulation is higher than of impregnated paper insulation. These cables are ideally suitable in hot and dry used such as in steel plant, foundries, rolling mills, furnaces, metallurgical plants and industrial substations. These are also suitable for the transmission of high voltage power over short distances.

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?