15) As per IE regulation, when service lines are insulated elsewhere other than along or across any street with insulated conductor, the conductor of the line at any part small have a height not less than a specified value. What is this specified height up to

16) In industries, number of machines are installed in rows. In such places overhead bus system is used for distribution of electrical supply to each machine. The recommended maximum current density for aluminium bus bar is

17) Service connection to consumer premises is provided either through overhead or through underground cable by tapping from OH line. Service connection line should be tapped from OH line at

18) What is the type of insulator used for holding the H.T. overhead conductor on straight running of poles ?

19) XLPE cable is one type of H.T. cable. The full form of XLPE is