General Order 64-A

Section III

General Provisions

32.2    Relative Levels.

Where supply and communication circuits or supply circuits of different voltage classifications are involved in crossings, conflicts or joint use, the higher voltage circuits shall in general be carried at the higher level.  This can not always be done, particularly where trolley circuits are involved or where poles are jointly occupied.  Trolley contact conductors will always cross below all other conductors and trolley feeders will usually do likewise.

It is recommended that lines be arranged by mutual agreement of the utilities concerned at standardized voltage levels throughout a given community in order to minimize difficulties when new crossing or extensions to existing lines are to be installed.

A.    Supply Circuits of 750-20,000 Volts

Supply circuits of 750-20,000 volts should not be above supply circuits in excess of 20,000 volts.

B.    Supply Circuits of 0-750 Volts

Supply circuits of 0-750 volts should not be above supply circuits in excess of 7500 volts.

C.    Supply Circuits of 0-750 Volts and Class T Circuits

Supply circuits of 0-750 volts all Class T circuits may cross under communication and railway circuits provided the clearances given in Tables 1 and 2 are observed.

D.    Supply Service Drops of 0-750 Volts.

Supply service drops of 0-750 volts shall not cross in a span above supply circuits (excepting Class T circuits) in excess of 750 volts, but service drops may cross above such circuits when supported on the same pole.

E.    Communication Service Drops.

Communication service drops should not cross in a span above supply circuits (excepting Class T circuits) of 750-7500 volts and shall not cross in a span above supply circuits in excess of 7500 volts.  Where it is necessary that communication service drops cross in a span above supply circuits of 750-7500 volts an auxiliary attachment or its approved equivalent shall be used at the service end of the service drop to insure against the drop falling across the supply circuit in the event of the failure of the usual means of attachment.