Change List for this Rule

 

Original Version

Rule 54.4-H1

  

54.4-H1)    Unattached Conductors: Conductors should be arranged so as not to hamperor 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.

 

 

Strikeout and Underline Version

Rule 54.4-H1

  

54.4-H1)    Unattached Conductors: Conductors should be arranged so as not to hamperor 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 24).  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.

 

 

Final Version

Rule 54.4-H1

  

54.4-H1)    Unattached Conductors: Conductors should be arranged so as not to hamperor 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. 54-24).  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.