54.4-H2)    Attached Conductors: Unprotected conductors not exceeding 20,000 volts may be supported by attachments to buildings, bridges and other structures.  To conductors of 0-750 volts so supported, the clearances of Table 1, case 7 columns B, C, and D shall apply.  To conductors of 750-20,000 volts so supported a minimum horizontal clearance of 8 feet shall apply.

In lieu of theses requirements for unprotected conductors, supply conductors may installed on the surface of buildings, bridges and other structures in grounded metal conduit or other grounded sheath or grounded shield suitably protected from mechanical injury.

54.4-H2)    Attached Conductors: Unprotected conductors not exceeding 20,000 21,000 volts may be supported by attachments to buildings, bridges and other structures.  To conductors of 0-750 volts so supported, the clearances of Table 1, case 7 columns B, C, and D shall apply.  To conductors of 750-20,000 21,000 volts so supported a minimum horizontal clearance of 8 feet shall apply.

In lieu of theses requirements for unprotected conductors, supply conductors may installed on the surface of buildings, bridges and other structures in grounded metal conduit or other grounded sheath or grounded shield suitably protected from mechanical injury.

54.4-H2)    Attached Conductors: Unprotected conductors not exceeding 21,000 volts may be supported by attachments to buildings, bridges and other structures.  To conductors of 0-750 volts so supported, the clearances of Table 1, case 7 columns B, C, and D shall apply.  To conductors of 750-21,000 volts so supported a minimum horizontal clearance of 8 feet shall apply.

In lieu of theses requirements for unprotected conductors, supply conductors may installed on the surface of buildings, bridges and other structures in grounded metal conduit or other grounded sheath or grounded shield suitably protected from mechanical injury.