Original version

Rule 54.4-C(2)

54.4-C2a    One Voltage Classification*: The clearance of Table 2, Case 14 (and clearances less than as specified in cases 9 to 13) shall not be applied consecutively both above and below the same conductor.  The foregoing provisions of this rule do not apply to conductors in triangular or vertical configuration, the clearances of Table 2, Case 14 being directly applicable.

Where Conductors of one voltage classification only are supported on the same crossarms, the vertical clearances specified in Table 2, Case 14 are not required between conductors on line arm and conductors on related buck arm provided no conductors on the line arm cross conductors of different phase or polarity on the buck arms.

*Voltage Classification for this purpose are:

0-750 volts

750-7500 volts

7500-20,000 volts and

20,000 volts and above.

Strikeout and Underline version

Rule 54.4-C(2)

54.4-C2a    One Voltage Classification*: The clearance of Table 2, Case 14 (and clearances less than as specified in cases 9 to 13) shall not be applied consecutively both above and below the same conductor.  The foregoing provisions of this rule do not apply to conductors in triangular or vertical configuration, the clearances of Table 2, Case 14 being directly applicable.

Where Conductors of one voltage classification only are supported on the same crossarms, the vertical clearances specified in Table 2, Case 14 are not required between conductors on line arm and conductors on related buck arm provided no conductors on the line arm cross conductors of different phase or polarity on the buck arms.

*Voltage Classification for this purpose are:

0-750 volts

750-7500 volts

7500-20,000 volts and

20,000 volts and above. – 75,000 volts

Final version

Rule 54.4-C(2)

54.4-C2a    One Voltage Classification*: The clearance of Table 2, Case 14 (and clearances less than as specified in cases 9 to 13) shall not be applied consecutively both above and below the same conductor.  The foregoing provisions of this rule do not apply to conductors in triangular or vertical configuration, the clearances of Table 2, Case 14 being directly applicable.

Where Conductors of one voltage classification only are supported on the same crossarms, the vertical clearances specified in Table 2, Case 14 are not required between conductors on line arm and conductors on related buck arm provided no conductors on the line arm cross conductors of different phase or polarity on the buck arms.

*Voltage Classification for this purpose are:

0-750 volts

750-7500 volts

7500-20,000 volts

20,000– 75,000 volts