General Order 64-A

Section III

General Provisions

32.3    Exceptional Cases.

Where it is not possible to conform to the standard arrangement whereby the higher voltage circuit shall be carried at the higher level, the positions may be reversed provided the lower voltage circuit, installed at the higher level, shall be erected and maintained with the same strength requirements as the higher voltage circuits would require with the standard arrangement of levels.  Where neither circuit carries in excess of 750 volts this provision does not apply.

Where supply and communication circuits carrying less than 750 volts cross trolley contact conductors carrying in excess of 750 volts they shall conform to the strength requirements for supply lines corresponding to the voltage of the trolley contact conductors.