OP000506Safety
1-28
Avoid High Voltage Cables
Serious injury or death can result from contact or proximity
to high voltage electric lines. The bucket does not have to
make physical contact with power lines for current to be
transmitted.
Use a spotter and hand signals to stay away from power
lines not clearly visible to operator.
Use these minimum distances as a guideline only.
Depending upon voltage in line and atmospheric conditions,
strong current shocks can occur with boom or bucket as far
away as 4 - 6 m (13 - 20 ft) from power line. Very high
voltage and rainy weather could further decrease that safety
margin.
NOTE: Before starting any type of operation near power lines
(either above ground or buried cable type) you should
always contact power utility directly and work out a
safety plan with them.
Before Starting to Dig, Contact
Authorities
Below ground hazards also include natural gas lines, water
mains, tunnels and buried foundations. Know what's
underneath work site before starting to dig.
Be Aware of Height Obstacles
Any type of object in vicinity of boom could represent a
potential hazard, or cause operator to react suddenly and
cause an accident. Use a spotter or signal person working
near bridges, phone lines, work site scaffolds, or other
obstructions.
Figure 17
Voltage Minimum Safe Distance
6.6 kV 3 m (9' 10")
33.0 kV 4 m (13' 1")
66.0 kV 5 m (16' 5")
154.0 kV 8 m (26' 3")
275.0 kV 10 m (32' 10")
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