Section 87(6) in The Indian Electricity Rules, 1956
(6)Where two lines cross, the crossing shall be made as nearly at right angles as the nature of the case admits [and as near the support of the line as practicable, and the support of the lower line shall not be erected below the upper line:] [ Added by G.S.R. 170, dated 15.1.1979 (w.e.f. 3.2.1979).][Provided that the angle of crossing of power lines shall not be less than 600.] [ Inserted by G.S.R. 274, dated 10.7.2002 (w.e.f. 20.7.2002).]
