General Order 64-A

Section XI

Supply Lines And Communication Lines Crossings Over Railways

111.2    Height Adjacent to Crossing.

The vertical difference of the conductor level between the crossing and adjacent poles, towers or structures shall at all times, be less than that which would produce an uplift strain on the pin, insulator or tie, on the adjacent poles, towers or structures to the crossing span, unless special precaution is taken to prevent the conductor from becoming detached from the insulator.