Company Name __________________________ Job Name __________________________ Date________
CRANE BOOMS AND POWER LINES
today is "Electrocution" or "What Can Happen When a Crane Boom
Hits an Energized Power Line".
Most of you
who have spent time in heavy construction know of someone who has been killed or
severely shocked or burned by such an accident. The cause is generally poor
judgment or forgetfulness. When a job is being planned, power lines
should be located and the voltages determined. Provisions should be made to
eliminate the danger by having the current shut off or to minimize the danger by
setting up safe procedures. Make sure you know if the current is shut off and
that you understand the established safe procedures when working around power
A TYPICAL CASE
Forgetfulness is bad enough. But poor judgment is
even worse, as illustrated by the following example: A change of work area made
it necessary to position a crane under a power line. With the boom in the air,
the crane was rolled forward and then stopped. Supposedly, it was far enough
away from the line to allow the boom to be lowered without hitting the wires.
But the boom didn't clear.
WHO WAS AT FAULT?
Who was guilty of poor judgment? The whole
crew, which includes the operator
and the men who guided the movement and gave the signals. What should the men
have done? Obviously, they should have stopped the crane farther back. They also
should have kept a close watch on the block as the boom was being lowered, and
signaled the operator to stop when it became evident that the boom was going to
hit the power line. Had they done so, the crane could have backed off and
completed the lowering without a mishap.
But what about the operator?
He knew the length of the boom and the arc I made when being raised or
lowered. He should have allowed enough distance to provide clearance, regardless
of the ground men's lack of judgment. All
crew members share the responsibility for preventing accidents in situations
such as the one described. All must be alert at all times; first to protect
themselves, and second, to protect the other person. If someone appears to be
forgetful or inattentive, wake that individual up.
When you're working close to a power line, use good judgment. Keep boom, cable block and tag line a minimum of ten feet away. Even greater clearance may be required, depending on voltage and work conditions. Remember that in some cases the current can jump from power line to the boom or cable without contact being made.
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