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‣  What can be the causes of damage to PVC cables and paper insulated cables?‣  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 ?‣  What is called “Barrier joint” of cable ?‣  What is called “Heat shrinkable joint” of cable?‣  What are the procedures to be adopted for determining the types of cable faults ?‣  What is proximity effect ?‣  What is soil thermal resistivity ?‣  What are the methods of cable laying ?‣  what special cares are to be taken for storage of cable drum ?‣  What are the load conditions of an underground cable ?‣  What do you mean by thermal resistance of a single core cable ?‣  What do you mean by the term “Dielectric losses” ?‣  What is the procedure of reducing the sheath losses in sheaths of the three single core cables in a 3-phase system ?‣  What do you mean by the term “Sheath losses” ?‣  What do you mean by MIND cable and where is it used ?‣  What do you mean by XLPE cable and what are its advantages over conventional cables ?‣  What are varnished cambric insulated cables ?‣  Interview Question of Underground Cable

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What is called “Barrier joint” of cable ?

Barrier joint is a very compact special type of screened joint and so constructed that each joint is itself a barrier to the flow of compound from the joint or the migration of compound from a high to a low level. In this type of joint, no liquid oil compound is used. The insulation consists of a hand applied paper tapes impregnated and coated with styrene which on being heated slowly polymerizes into a hard solid mass and forms a complete barrier. “Barrier joint” is also known as Styrene joint. This method is specially useful for high voltage 3-core cable as the joint is mechanically rigid and displacement of the cores can not occur.

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