OP000753Safety
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")
To Next Page
