Change List for this Rule

 

Original Version

Rule 54.4-H1

 

54.4-H1)    Unattached Conductors: Conductors should be arranged so as not to hamper or endanger workers and firefighters while performing their duties.  The basic clearances of conductors from buildings are specified in Table 1, Cases 6 and 7.  The horizontal clearance (Table 1, Case 7) shall be maintained until the vertical clearance (Table 1, Case 6) is attained (see Fig. 54-13).  The horizontal clearance   The requirements of Table 1, Cases 7 also apply at fire escapes, exits, windows, etc., at which human contact may be reasonably expected.

|Where the vertical distance above ground of conductors of 7500 volts less is in excess of 35 feet, the horizontal clearances front eh buildings may be less than 6 feet (Table 1, Case 7, Column E) but shall be not less than 4 feet.
  See Rule 54.8-B4 for service drop clearance requirements.

For special treatment of bus and lead wires of transformer installations in alleys, etc., see rules 58.3-B2.

 

 

Strikeout and Underline Version

Rule 54.4-H1

  

54.4-H1)    Unattached Conductors: Conductors should be arranged so as not to hamper or endanger workers and firefighters while performing their duties.  The basic clearances of conductors from buildings are specified in Table 1, Cases 6 and 7.  The horizontal clearance (Table 1, Case 7) shall be maintained until the vertical clearance (Table 1, Case 6) is attained (see Fig. 54-13).  The horizontal clearance   The requirements of Table 1, Cases 7 also apply at fire escapes, exits, windows, etc., at which human contact may be reasonably expected.

Where the vertical distance above ground of conductors of 7500 volts less is in excess of 35 feet, the horizontal clearances front eh buildings may be less than 6 feet (Table 1, Case 7, Column E) but shall be not less than 4 feet.
  See Rule 54.8-B4 for service drop clearance requirements.

For special treatment of bus and lead wires of transformer installations in alleys, etc., see rules 58.3-B2.

 

EXCEPTION:    The horizontal conductor clearance from buildings may be reduced from 6 feet to 4 feet ( Table 1, Case 7, Column E ) if all of the following criteria are met:

 

a)    The conductor voltage is 7,500 volts or less; and

 

b)    The conductor vertical clearance above ground is more than 35 feet; and

 

c)    The building height next to the conductors exceeds the conductor height by 6 feet or more; and

 

d)    There are no fire escapes, exits, or windows at which human contact may be reasonably expected.

 

Note:    See Rule 54.8B4 for service drop clearance requirements and Table 581 for special treatment of bus and lead wires of transformer installations in alleys.

 

 

Final Version

Rule 54.4-H1

  

54.4-H1)    Unattached Conductors: Conductors should be arranged so as not to hamper or endanger workers and firefighters while performing their duties.  The basic clearances of conductors from buildings are specified in Table 1, Cases 6 and 7.  The horizontal clearance (Table 1, Case 7) shall be maintained until the vertical clearance (Table 1, Case 6) is attained (see Fig. 54-13).  The horizontal clearance   The requirements of Table 1, Cases 7 also apply at fire escapes, exits, windows, etc., at which human contact may be reasonably expected.

 

EXCEPTION:    The horizontal conductor clearance from buildings may be reduced from 6 feet to 4 feet ( Table 1, Case 7, Column E ) if all of the following criteria are met:

 

a)    The conductor voltage is 7,500 volts or less; and

 

b)    The conductor vertical clearance above ground is more than 35 feet; and

 

c)    The building height next to the conductors exceeds the conductor height by 6 feet or more; and

 

d)    There are no fire escapes, exits, or windows at which human contact may be reasonably expected.

 

Note:    See Rule 54.8B4 for service drop clearance requirements and Table 581 for special treatment of bus and lead wires of transformer installations in alleys.