QUALIFICATIONS FOR AND CONDUCT OF OPERATORS AND OPERATING PRACTICES
No person should be permitted to stand or pass under a suspended load.
Stowing procedure. Follow the manufacturer's procedure and sequence when stowing and un-stowing the crane.
OPERATING NEAR ELECTRICAL POWER LINES
Caution shall be exercised when working near overhead lines, because they can move horizontally or vertically due to wind, moving the danger zone to new positions.
In transit with no load and boom lowered the clearance shall be specified in Table 1.
A qualified signalperson shall be assigned to observe the clearance and give warning before approaching the above limits.
Any overhead wire shall be considered to be an energized line unless and until the person owning such line or the electrical utility authorities verify that it is not an energized line.
Exceptions to this procedure are allowed, if approved by the administrative or regulatory authority provided the alternate procedure insures equivalent protection and is set forth in writing.
Durable signs shall be installed at the operator's station and on the outside of the crane, warning that electrocution or serious bodily injury may occur unless a minimum clearance of 10 ft.
(3.0m) between the crane or the load being handled and energized power lines. Greater clearances are required because of higher voltage as stated above. These signs shall be revised but not removed when local jurisdiction requires greater clearances.
TABLE 1 minimum required clearance
_ _ _ _
Cranes shall be operated so that no part of the crane or load enters into the danger zone shown above.
normal voltage, kV (phase to phase)
when operating near high voltage power lines
The danger zone may be entered after confirmation by an appointed person that the electrical distribution and transmission lines have been de-energized and visibly grounded at the point of work; or
The danger zone may be entered if insulating barriers (not a part of nor an attachment to the crane) have been erected to prevent physical contact with the lines.
For lines rated 50 kV or below, minimum clearance between the lines and any part of the crane or load (including handling appendages) shall be 10-ft. (3m). For higher voltages, see Table 1.
over over over over over over
750 to 1000
10 15 20 25 35 45
(3.50) (4.6) (6.1) (7.62) (10.67) (13.72)
while in transit with no load and boom lowered