8. Operating Precautions
1-10
WARNING
These instructions should be strictly followed for the safety of you, others and your machine.
• Undermining a cliff is dangerous as it may cause a rockslide or landslide.
• Undercutting the machine is dangerous as it may cause a cave-in, resulting in the machine over-
turning and falling into the excavation..
• Working in the vicinity of overhead electric power lines presents a very serious hazard and special
precautions must be taken. For purposes of this manual you are considered to be working in the
vicinity of overhead power lines when the attachment or load of your excavator, in any position,
can reach to within the minimum distances shown below.
• The following procedures are effective in preventing accidents or injuries.
1) Wear shoes with rubber or leather soles.
2) Use a signal person to warn the operator when the machine is getting too close to a power line.
• If the machine should contact a wire, the operator must not leave the seat.
• When working near power lines, caution all ground personnel to stand clear of the machine.
• To determine the transmission voltage at the working site, contact the electric utility concerned.
Avoid hazardous work
Keep away from electric power lines
Transmission voltage (V) Minimum safe distance [ft. (mm)]
Power
distribution
100/200 or less 6.6 (2000) or more
6600 or less 6.6 (2000) or more
Transmission
line
22000 or less 9.8 (3000) or more
66000 or less 13.1 (4000) or more
154000 or less 16.4 (5000) or more
275000 or less 23.0 (7000) or more
Undermining
Under cutting
000292-00E
000293-00X
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