92.1-F1)    Unenergized and Ungrounded Equipment: Communication conductors or 0-750 volt supply conductors, which are on crossarms with not less than 15-inch clearance from center line of pole or which are attached to pole surface and provided with guard arm, shall be not less than 40 inches below unenergized and ungrounded cases or enclosures of apparatus of the other classification.

92.1-F1)    Unenergized and Ungrounded Parts of Energized Equipment: Communication conductors or 0-750 volt supply conductors, of different ownership which are on crossarms with not less than 15-inch clearance either supported 15 inches or more from center line of pole, or which are attached to the pole, surface and provided with guard arm, shall be not less than 40 48 inches or more below the unenergized and ungrounded cases or enclosures of the energized apparatus of the other classification.

92.1-F1)    Unenergized Parts of Energized Equipment: Communication conductors or 0-750 volt supply conductors, of different ownership which are either supported 15 inches or more from center line of pole, or are attached to the surface and provided with guard arm, shall be 48 inches or more below the unenergized cases or enclosures of the energized apparatus of the other classification.